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<div class="section" id="map-resources-and-topography">
<h1>Map Resources and Topography<a class="headerlink" href="#map-resources-and-topography" title="Permalink to this headline"></a></h1>
<p><a class="reference external" href="http://nbviewer.ipython.org/github/Unidata/python-awips/blob/master/examples/notebooks/Map_Resources_and_Topography.ipynb">Notebook</a>
Python-AWIPS Tutorial Notebook</p>
<hr class="docutils" />
<div class="section" id="objectives">
<h2>Objectives<a class="headerlink" href="#objectives" title="Permalink to this headline"></a></h2>
<ul class="simple">
<li><p>Use python-awips to connect to an edex server</p></li>
<li><p>Define data request object specifically for the maps database</p></li>
<li><p>Manipulate request object for various different map resources</p></li>
<li><p>Plot map resources in combination with one another for geographical
context</p></li>
</ul>
<hr class="docutils" />
<div class="section" id="table-of-contents">
<h3>Table of Contents<a class="headerlink" href="#table-of-contents" title="Permalink to this headline"></a></h3>
<div class="line-block">
<div class="line"><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html#imports">1
Imports</a></div>
<div class="line"><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html#connect-to-edex">2 Connect to
EDEX</a></div>
<div class="line"><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html#function-make-map">3 Function:
make_map()</a></div>
<div class="line"><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html#create-initial-map-from-cwa">4 Create Initial Map From
CWA</a></div>
<div class="line"><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html#draw-merged-cwa">5 Draw Merged
CWA</a></div>
<div class="line"><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html#draw-interstates-using-boundary-filter">6 Draw Interstates using Boundary
Filter</a></div>
<div class="line"><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html#draw-nearby-cities">7 Draw Nearby
Cities</a></div>
<div class="line"><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html#draw-nearby-lakes">8 Draw Nearby
Lakes</a></div>
<div class="line"><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html#draw-major-rivers">9 Draw Major
Rivers</a></div>
<div class="line"><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html#draw-topography">10 Draw
Topography</a></div>
<div class="line"><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html#see-also">11 See
Also</a></div>
<div class="line">    <a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html#additional-documentation">11.1 Additional
Documentation</a></div>
</div>
</div>
<div class="section" id="imports">
<h3>1 Imports<a class="headerlink" href="#imports" title="Permalink to this headline"></a></h3>
<p>The imports below are used throughout the notebook. Note the first
import is coming directly from python-awips and allows us to connect to
an EDEX server. The subsequent imports are for data manipulation and
visualization.</p>
<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="kn">from</span> <span class="nn">awips.dataaccess</span> <span class="kn">import</span> <span class="n">DataAccessLayer</span>
<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="k">as</span> <span class="nn">plt</span>
<span class="kn">import</span> <span class="nn">cartopy.crs</span> <span class="k">as</span> <span class="nn">ccrs</span>
<span class="kn">import</span> <span class="nn">numpy.ma</span> <span class="k">as</span> <span class="nn">ma</span>
<span class="kn">from</span> <span class="nn">cartopy.mpl.gridliner</span> <span class="kn">import</span> <span class="n">LONGITUDE_FORMATTER</span><span class="p">,</span> <span class="n">LATITUDE_FORMATTER</span>
<span class="kn">from</span> <span class="nn">cartopy.feature</span> <span class="kn">import</span> <span class="n">ShapelyFeature</span><span class="p">,</span><span class="n">NaturalEarthFeature</span>
<span class="kn">from</span> <span class="nn">shapely.ops</span> <span class="kn">import</span> <span class="n">cascaded_union</span>
</pre></div>
</div>
<p><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html">Top</a></p>
</div>
<hr class="docutils" />
<div class="section" id="connect-to-edex">
<h3>2 Connect to EDEX<a class="headerlink" href="#connect-to-edex" title="Permalink to this headline"></a></h3>
<p>First we establish a connection to Unidata’s public EDEX server. With
that connection made, we can create a <a class="reference external" href="http://unidata.github.io/python-awips/api/IDataRequest.html">new data request
object</a>
and set the data type to <strong>maps</strong>.</p>
<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Server, Data Request Type, and Database Table</span>
<span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">changeEDEXHost</span><span class="p">(</span><span class="s2">&quot;edex-cloud.unidata.ucar.edu&quot;</span><span class="p">)</span>
<span class="n">request</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">newDataRequest</span><span class="p">(</span><span class="s1">&#39;maps&#39;</span><span class="p">)</span>
</pre></div>
</div>
<p><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html">Top</a></p>
</div>
<hr class="docutils" />
<div class="section" id="function-make-map">
<h3>3 Function: make_map()<a class="headerlink" href="#function-make-map" title="Permalink to this headline"></a></h3>
<p>In many of our notebooks we end up plotting map images, and this logic
below is the same from those other notebooks. Typically, functions are
defined when they are called multiple times throughout a notebook. In
this case, we only use it in one code block cell, but because it is a
common function from several of our notebooks, it’s nice to keep the
logic neatly defined for consistency.</p>
<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Standard map plot</span>
<span class="k">def</span> <span class="nf">make_map</span><span class="p">(</span><span class="n">bbox</span><span class="p">,</span> <span class="n">projection</span><span class="o">=</span><span class="n">ccrs</span><span class="o">.</span><span class="n">PlateCarree</span><span class="p">()):</span>
<span class="n">fig</span><span class="p">,</span> <span class="n">ax</span> <span class="o">=</span> <span class="n">plt</span><span class="o">.</span><span class="n">subplots</span><span class="p">(</span><span class="n">figsize</span><span class="o">=</span><span class="p">(</span><span class="mi">12</span><span class="p">,</span><span class="mi">12</span><span class="p">),</span>
<span class="n">subplot_kw</span><span class="o">=</span><span class="nb">dict</span><span class="p">(</span><span class="n">projection</span><span class="o">=</span><span class="n">projection</span><span class="p">))</span>
<span class="n">ax</span><span class="o">.</span><span class="n">set_extent</span><span class="p">(</span><span class="n">bbox</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">coastlines</span><span class="p">(</span><span class="n">resolution</span><span class="o">=</span><span class="s1">&#39;50m&#39;</span><span class="p">)</span>
<span class="n">gl</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">gridlines</span><span class="p">(</span><span class="n">draw_labels</span><span class="o">=</span><span class="kc">True</span><span class="p">)</span>
<span class="n">gl</span><span class="o">.</span><span class="n">top_labels</span> <span class="o">=</span> <span class="n">gl</span><span class="o">.</span><span class="n">right_labels</span> <span class="o">=</span> <span class="kc">False</span>
<span class="n">gl</span><span class="o">.</span><span class="n">xformatter</span> <span class="o">=</span> <span class="n">LONGITUDE_FORMATTER</span>
<span class="n">gl</span><span class="o">.</span><span class="n">yformatter</span> <span class="o">=</span> <span class="n">LATITUDE_FORMATTER</span>
<span class="k">return</span> <span class="n">fig</span><span class="p">,</span> <span class="n">ax</span>
</pre></div>
</div>
<p><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html">Top</a></p>
</div>
<hr class="docutils" />
<div class="section" id="create-initial-map-from-cwa">
<h3>4 Create Initial Map From CWA<a class="headerlink" href="#create-initial-map-from-cwa" title="Permalink to this headline"></a></h3>
<p>The python-awips package provides access to the entire AWIPS Maps
Database for use in Python GIS applications. Map objects are returned as
Shapely geometries and can be easily plotted by many Python packages.</p>
<ul class="simple">
<li><p>Each map database table has a geometry field called <code class="docutils literal notranslate"><span class="pre">the_geom</span></code>,
which can be used to spatially select map resources for any column of
type geometry.</p></li>
</ul>
<div class="alert-info docutils container">
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="n">b</span><span class="o">&gt;</span><span class="n">Tip</span><span class="p">:</span><span class="o">&lt;/</span><span class="n">b</span><span class="o">&gt;</span> <span class="n">Note</span> <span class="n">the</span> <span class="n">geometry</span> <span class="n">definition</span> <span class="n">of</span> <span class="o">&lt;</span><span class="n">code</span><span class="o">&gt;</span><span class="n">the_geom</span><span class="o">&lt;/</span><span class="n">code</span><span class="o">&gt;</span> <span class="k">for</span> <span class="n">each</span> <span class="n">data</span> <span class="nb">type</span><span class="p">,</span> <span class="n">which</span> <span class="n">can</span> <span class="n">be</span> <span class="o">&lt;</span><span class="n">b</span><span class="o">&gt;</span><span class="n">Point</span><span class="o">&lt;/</span><span class="n">b</span><span class="o">&gt;</span><span class="p">,</span> <span class="o">&lt;</span><span class="n">b</span><span class="o">&gt;</span><span class="n">MultiPolygon</span><span class="o">&lt;/</span><span class="n">b</span><span class="o">&gt;</span><span class="p">,</span> <span class="ow">or</span> <span class="o">&lt;</span><span class="n">b</span><span class="o">&gt;</span><span class="n">MultiLineString</span><span class="o">&lt;/</span><span class="n">b</span><span class="o">&gt;.</span>
</pre></div>
</div>
</div>
<p>Here we’ll be using Boulder (BOU) as our example for plotting the County
Warning Area (CWA). We’ll query our EDEX server to get all counties in
the CWA for BOU, and then plot those counties along withe the state
boundaries and lines of longitude and latitude. In order to get this
information from EDEX, we’ll need to set several characteristics on our
data request object. We will use
<a class="reference external" href="http://unidata.github.io/python-awips/api/IDataRequest.html#awips.dataaccess.IDataRequest.setParameters">request.setParameters()</a>
to refine our query to EDEX.</p>
<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Specify the necessary identifiers for requesting the Boulder CWA</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;table&#39;</span><span class="p">,</span> <span class="s1">&#39;mapdata.county&#39;</span><span class="p">)</span>
<span class="c1"># Define a WFO ID for location</span>
<span class="c1"># tie this ID to the mapdata.county column &quot;cwa&quot; for filtering</span>
<span class="n">request</span><span class="o">.</span><span class="n">setLocationNames</span><span class="p">(</span><span class="s1">&#39;BOU&#39;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;cwa&#39;</span><span class="p">,</span> <span class="s1">&#39;BOU&#39;</span><span class="p">)</span>
<span class="c1"># enable location filtering (inLocation)</span>
<span class="c1"># locationField is tied to the above cwa definition (BOU)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;geomField&#39;</span><span class="p">,</span> <span class="s1">&#39;the_geom&#39;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;inLocation&#39;</span><span class="p">,</span> <span class="s1">&#39;true&#39;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;locationField&#39;</span><span class="p">,</span> <span class="s1">&#39;cwa&#39;</span><span class="p">)</span>
<span class="c1"># Get response and create dict of county geometries</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">getGeometryData</span><span class="p">(</span><span class="n">request</span><span class="p">)</span>
<span class="n">counties</span> <span class="o">=</span> <span class="p">[]</span>
<span class="k">for</span> <span class="n">ob</span> <span class="ow">in</span> <span class="n">response</span><span class="p">:</span>
<span class="n">counties</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">ob</span><span class="o">.</span><span class="n">getGeometry</span><span class="p">())</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Using &quot;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">counties</span><span class="p">))</span> <span class="o">+</span> <span class="s2">&quot; county MultiPolygons&quot;</span><span class="p">)</span>
<span class="c1"># All WFO counties merged to a single Polygon</span>
<span class="n">merged_counties</span> <span class="o">=</span> <span class="n">cascaded_union</span><span class="p">(</span><span class="n">counties</span><span class="p">)</span>
<span class="n">envelope</span> <span class="o">=</span> <span class="n">merged_counties</span><span class="o">.</span><span class="n">buffer</span><span class="p">(</span><span class="mi">2</span><span class="p">)</span>
<span class="n">boundaries</span><span class="o">=</span><span class="p">[</span><span class="n">merged_counties</span><span class="p">]</span>
<span class="c1"># Get bounds of this merged Polygon to use as buffered map extent</span>
<span class="n">bounds</span> <span class="o">=</span> <span class="n">merged_counties</span><span class="o">.</span><span class="n">bounds</span>
<span class="n">bbox</span><span class="o">=</span><span class="p">[</span><span class="n">bounds</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">-</span><span class="mi">1</span><span class="p">,</span><span class="n">bounds</span><span class="p">[</span><span class="mi">2</span><span class="p">]</span><span class="o">+</span><span class="mi">1</span><span class="p">,</span><span class="n">bounds</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span><span class="o">-</span><span class="mf">1.5</span><span class="p">,</span><span class="n">bounds</span><span class="p">[</span><span class="mi">3</span><span class="p">]</span><span class="o">+</span><span class="mf">1.5</span><span class="p">]</span>
<span class="c1"># Create the map we&#39;ll use for the rest of this notebook based on the</span>
<span class="c1"># boundaries of the CWA</span>
<span class="n">fig</span><span class="p">,</span> <span class="n">ax</span> <span class="o">=</span> <span class="n">make_map</span><span class="p">(</span><span class="n">bbox</span><span class="o">=</span><span class="n">bbox</span><span class="p">)</span>
<span class="c1"># Plot political/state boundaries handled by Cartopy</span>
<span class="n">political_boundaries</span> <span class="o">=</span> <span class="n">NaturalEarthFeature</span><span class="p">(</span><span class="n">category</span><span class="o">=</span><span class="s1">&#39;cultural&#39;</span><span class="p">,</span>
<span class="n">name</span><span class="o">=</span><span class="s1">&#39;admin_0_boundary_lines_land&#39;</span><span class="p">,</span>
<span class="n">scale</span><span class="o">=</span><span class="s1">&#39;50m&#39;</span><span class="p">,</span> <span class="n">facecolor</span><span class="o">=</span><span class="s1">&#39;none&#39;</span><span class="p">)</span>
<span class="n">states</span> <span class="o">=</span> <span class="n">NaturalEarthFeature</span><span class="p">(</span><span class="n">category</span><span class="o">=</span><span class="s1">&#39;cultural&#39;</span><span class="p">,</span>
<span class="n">name</span><span class="o">=</span><span class="s1">&#39;admin_1_states_provinces_lines&#39;</span><span class="p">,</span>
<span class="n">scale</span><span class="o">=</span><span class="s1">&#39;50m&#39;</span><span class="p">,</span> <span class="n">facecolor</span><span class="o">=</span><span class="s1">&#39;none&#39;</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_feature</span><span class="p">(</span><span class="n">political_boundaries</span><span class="p">,</span> <span class="n">linestyle</span><span class="o">=</span><span class="s1">&#39;-&#39;</span><span class="p">,</span> <span class="n">edgecolor</span><span class="o">=</span><span class="s1">&#39;black&#39;</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_feature</span><span class="p">(</span><span class="n">states</span><span class="p">,</span> <span class="n">linestyle</span><span class="o">=</span><span class="s1">&#39;-&#39;</span><span class="p">,</span> <span class="n">edgecolor</span><span class="o">=</span><span class="s1">&#39;black&#39;</span><span class="p">,</span><span class="n">linewidth</span><span class="o">=</span><span class="mi">2</span><span class="p">)</span>
<span class="c1"># Plot CWA counties</span>
<span class="n">shape_feature</span> <span class="o">=</span> <span class="n">ShapelyFeature</span><span class="p">(</span><span class="n">counties</span><span class="p">,</span><span class="n">ccrs</span><span class="o">.</span><span class="n">PlateCarree</span><span class="p">(),</span>
<span class="n">facecolor</span><span class="o">=</span><span class="s1">&#39;none&#39;</span><span class="p">,</span> <span class="n">linestyle</span><span class="o">=</span><span class="s2">&quot;-&quot;</span><span class="p">,</span><span class="n">edgecolor</span><span class="o">=</span><span class="s1">&#39;#86989B&#39;</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_feature</span><span class="p">(</span><span class="n">shape_feature</span><span class="p">)</span>
</pre></div>
</div>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Using</span> <span class="mi">22</span> <span class="n">county</span> <span class="n">MultiPolygons</span>
</pre></div>
</div>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="n">cartopy</span><span class="o">.</span><span class="n">mpl</span><span class="o">.</span><span class="n">feature_artist</span><span class="o">.</span><span class="n">FeatureArtist</span> <span class="n">at</span> <span class="mh">0x11568f6d0</span><span class="o">&gt;</span>
</pre></div>
</div>
<img alt="../../_images/Map_Resources_and_Topography_13_2.png" src="../../_images/Map_Resources_and_Topography_13_2.png" />
<p><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html">Top</a></p>
</div>
<hr class="docutils" />
<div class="section" id="draw-merged-cwa">
<h3>5 Draw Merged CWA<a class="headerlink" href="#draw-merged-cwa" title="Permalink to this headline"></a></h3>
<p>In the previous section we created a merged polygon with the applicable
counties. Here, we draw this new shape on top of our existing map in a
burnt orange color.</p>
<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Plot CWA envelope</span>
<span class="n">shape_feature</span> <span class="o">=</span> <span class="n">ShapelyFeature</span><span class="p">(</span><span class="n">boundaries</span><span class="p">,</span><span class="n">ccrs</span><span class="o">.</span><span class="n">PlateCarree</span><span class="p">(),</span>
<span class="n">facecolor</span><span class="o">=</span><span class="s1">&#39;none&#39;</span><span class="p">,</span> <span class="n">linestyle</span><span class="o">=</span><span class="s2">&quot;-&quot;</span><span class="p">,</span><span class="n">linewidth</span><span class="o">=</span><span class="mf">3.</span><span class="p">,</span><span class="n">edgecolor</span><span class="o">=</span><span class="s1">&#39;#cc5000&#39;</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_feature</span><span class="p">(</span><span class="n">shape_feature</span><span class="p">)</span>
<span class="n">fig</span>
</pre></div>
</div>
<img alt="../../_images/Map_Resources_and_Topography_16_0.png" src="../../_images/Map_Resources_and_Topography_16_0.png" />
<p><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html">Top</a></p>
</div>
<hr class="docutils" />
<div class="section" id="draw-interstates-using-boundary-filter">
<h3>6 Draw Interstates using Boundary Filter<a class="headerlink" href="#draw-interstates-using-boundary-filter" title="Permalink to this headline"></a></h3>
<p>Now, we’ll use the previously-defined
<strong>envelope=merged_counties.buffer(2)</strong> in a <strong>newDataRequest()</strong> to
request interstate geometries which fall inside the buffered boundary.</p>
<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Define the request for the interstate query</span>
<span class="n">request</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">newDataRequest</span><span class="p">(</span><span class="s1">&#39;maps&#39;</span><span class="p">,</span> <span class="n">envelope</span><span class="o">=</span><span class="n">envelope</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;table&#39;</span><span class="p">,</span> <span class="s1">&#39;mapdata.interstate&#39;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;geomField&#39;</span><span class="p">,</span> <span class="s1">&#39;the_geom&#39;</span><span class="p">)</span>
<span class="n">interstates</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">getGeometryData</span><span class="p">(</span><span class="n">request</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Using &quot;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">interstates</span><span class="p">))</span> <span class="o">+</span> <span class="s2">&quot; interstate MultiLineStrings&quot;</span><span class="p">)</span>
<span class="c1"># Plot interstates</span>
<span class="k">for</span> <span class="n">ob</span> <span class="ow">in</span> <span class="n">interstates</span><span class="p">:</span>
<span class="n">shape_feature</span> <span class="o">=</span> <span class="n">ShapelyFeature</span><span class="p">(</span><span class="n">ob</span><span class="o">.</span><span class="n">getGeometry</span><span class="p">(),</span><span class="n">ccrs</span><span class="o">.</span><span class="n">PlateCarree</span><span class="p">(),</span>
<span class="n">facecolor</span><span class="o">=</span><span class="s1">&#39;none&#39;</span><span class="p">,</span> <span class="n">linestyle</span><span class="o">=</span><span class="s2">&quot;-&quot;</span><span class="p">,</span><span class="n">edgecolor</span><span class="o">=</span><span class="s1">&#39;orange&#39;</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_feature</span><span class="p">(</span><span class="n">shape_feature</span><span class="p">)</span>
<span class="n">fig</span>
</pre></div>
</div>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Using</span> <span class="mi">225</span> <span class="n">interstate</span> <span class="n">MultiLineStrings</span>
</pre></div>
</div>
<img alt="../../_images/Map_Resources_and_Topography_19_1.png" src="../../_images/Map_Resources_and_Topography_19_1.png" />
<p><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html">Top</a></p>
</div>
<hr class="docutils" />
<div class="section" id="draw-nearby-cities">
<h3>7 Draw Nearby Cities<a class="headerlink" href="#draw-nearby-cities" title="Permalink to this headline"></a></h3>
<p>Request the city table based using the <strong>envelope</strong> attribute and filter
by population and progressive disclosure level.</p>
<div class="alert-warning docutils container">
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">&lt;</span><span class="n">b</span><span class="o">&gt;</span><span class="ne">Warning</span><span class="p">:</span><span class="o">&lt;/</span><span class="n">b</span><span class="o">&gt;</span> <span class="n">the</span> <span class="o">&lt;</span><span class="n">code</span><span class="o">&gt;</span><span class="n">prog_disc</span><span class="o">&lt;/</span><span class="n">code</span><span class="o">&gt;</span> <span class="n">field</span> <span class="ow">is</span> <span class="ow">not</span> <span class="n">entirely</span> <span class="n">understood</span> <span class="ow">and</span> <span class="n">values</span> <span class="n">appear</span> <span class="n">to</span> <span class="n">change</span> <span class="n">significantly</span> <span class="n">depending</span> <span class="n">on</span> <span class="n">WFO</span> <span class="n">site</span><span class="o">.</span>
</pre></div>
</div>
</div>
<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Define the request for the city query</span>
<span class="n">request</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">newDataRequest</span><span class="p">(</span><span class="s1">&#39;maps&#39;</span><span class="p">,</span> <span class="n">envelope</span><span class="o">=</span><span class="n">envelope</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;table&#39;</span><span class="p">,</span> <span class="s1">&#39;mapdata.city&#39;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;geomField&#39;</span><span class="p">,</span> <span class="s1">&#39;the_geom&#39;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">setParameters</span><span class="p">(</span><span class="s1">&#39;name&#39;</span><span class="p">,</span><span class="s1">&#39;population&#39;</span><span class="p">,</span><span class="s1">&#39;prog_disc&#39;</span><span class="p">)</span>
<span class="n">cities</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">getGeometryData</span><span class="p">(</span><span class="n">request</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Queried &quot;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">cities</span><span class="p">))</span> <span class="o">+</span> <span class="s2">&quot; total cities&quot;</span><span class="p">)</span>
<span class="c1"># Set aside two arrays - one for the geometry of the cities and one for their names</span>
<span class="n">citylist</span> <span class="o">=</span> <span class="p">[]</span>
<span class="n">cityname</span> <span class="o">=</span> <span class="p">[]</span>
<span class="c1"># For BOU, progressive disclosure values above 50 and pop above 5000 looks good</span>
<span class="k">for</span> <span class="n">ob</span> <span class="ow">in</span> <span class="n">cities</span><span class="p">:</span>
<span class="k">if</span> <span class="n">ob</span><span class="o">.</span><span class="n">getString</span><span class="p">(</span><span class="s2">&quot;population&quot;</span><span class="p">)</span> <span class="o">!=</span> <span class="s1">&#39;None&#39;</span><span class="p">:</span>
<span class="k">if</span> <span class="n">ob</span><span class="o">.</span><span class="n">getNumber</span><span class="p">(</span><span class="s2">&quot;prog_disc&quot;</span><span class="p">)</span> <span class="o">&gt;</span> <span class="mi">50</span> <span class="ow">and</span> <span class="nb">int</span><span class="p">(</span><span class="n">ob</span><span class="o">.</span><span class="n">getString</span><span class="p">(</span><span class="s2">&quot;population&quot;</span><span class="p">))</span> <span class="o">&gt;</span> <span class="mi">5000</span><span class="p">:</span>
<span class="n">citylist</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">ob</span><span class="o">.</span><span class="n">getGeometry</span><span class="p">())</span>
<span class="n">cityname</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">ob</span><span class="o">.</span><span class="n">getString</span><span class="p">(</span><span class="s2">&quot;name&quot;</span><span class="p">))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Plotting &quot;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">cityname</span><span class="p">))</span> <span class="o">+</span> <span class="s2">&quot; cities&quot;</span><span class="p">)</span>
<span class="c1"># Plot city markers</span>
<span class="n">ax</span><span class="o">.</span><span class="n">scatter</span><span class="p">([</span><span class="n">point</span><span class="o">.</span><span class="n">x</span> <span class="k">for</span> <span class="n">point</span> <span class="ow">in</span> <span class="n">citylist</span><span class="p">],</span>
<span class="p">[</span><span class="n">point</span><span class="o">.</span><span class="n">y</span> <span class="k">for</span> <span class="n">point</span> <span class="ow">in</span> <span class="n">citylist</span><span class="p">],</span>
<span class="n">transform</span><span class="o">=</span><span class="n">ccrs</span><span class="o">.</span><span class="n">PlateCarree</span><span class="p">(),</span><span class="n">marker</span><span class="o">=</span><span class="s2">&quot;+&quot;</span><span class="p">,</span><span class="n">facecolor</span><span class="o">=</span><span class="s1">&#39;black&#39;</span><span class="p">)</span>
<span class="c1"># Plot city names</span>
<span class="k">for</span> <span class="n">i</span><span class="p">,</span> <span class="n">txt</span> <span class="ow">in</span> <span class="nb">enumerate</span><span class="p">(</span><span class="n">cityname</span><span class="p">):</span>
<span class="n">ax</span><span class="o">.</span><span class="n">annotate</span><span class="p">(</span><span class="n">txt</span><span class="p">,</span> <span class="p">(</span><span class="n">citylist</span><span class="p">[</span><span class="n">i</span><span class="p">]</span><span class="o">.</span><span class="n">x</span><span class="p">,</span><span class="n">citylist</span><span class="p">[</span><span class="n">i</span><span class="p">]</span><span class="o">.</span><span class="n">y</span><span class="p">),</span>
<span class="n">xytext</span><span class="o">=</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span><span class="mi">3</span><span class="p">),</span> <span class="n">textcoords</span><span class="o">=</span><span class="s2">&quot;offset points&quot;</span><span class="p">)</span>
<span class="n">fig</span>
</pre></div>
</div>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Queried</span> <span class="mi">1205</span> <span class="n">total</span> <span class="n">cities</span>
<span class="n">Plotting</span> <span class="mi">58</span> <span class="n">cities</span>
</pre></div>
</div>
<img alt="../../_images/Map_Resources_and_Topography_22_1.png" src="../../_images/Map_Resources_and_Topography_22_1.png" />
<p><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html">Top</a></p>
</div>
<hr class="docutils" />
<div class="section" id="draw-nearby-lakes">
<h3>8 Draw Nearby Lakes<a class="headerlink" href="#draw-nearby-lakes" title="Permalink to this headline"></a></h3>
<p>Again, use the <strong>envelope</strong> attribute to define a new data requst for
the nearby lakes.</p>
<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Define request for lakes</span>
<span class="n">request</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">newDataRequest</span><span class="p">(</span><span class="s1">&#39;maps&#39;</span><span class="p">,</span> <span class="n">envelope</span><span class="o">=</span><span class="n">envelope</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;table&#39;</span><span class="p">,</span> <span class="s1">&#39;mapdata.lake&#39;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;geomField&#39;</span><span class="p">,</span> <span class="s1">&#39;the_geom&#39;</span><span class="p">)</span>
<span class="c1"># Get lake geometries</span>
<span class="n">response</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">getGeometryData</span><span class="p">(</span><span class="n">request</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Using &quot;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">response</span><span class="p">))</span> <span class="o">+</span> <span class="s2">&quot; lake MultiPolygons&quot;</span><span class="p">)</span>
<span class="c1"># Plot lakes</span>
<span class="n">shape_feature</span> <span class="o">=</span> <span class="n">ShapelyFeature</span><span class="p">([</span><span class="n">lake</span><span class="o">.</span><span class="n">getGeometry</span><span class="p">()</span> <span class="k">for</span> <span class="n">lake</span> <span class="ow">in</span> <span class="n">response</span><span class="p">],</span><span class="n">ccrs</span><span class="o">.</span><span class="n">PlateCarree</span><span class="p">(),</span>
<span class="n">facecolor</span><span class="o">=</span><span class="s1">&#39;blue&#39;</span><span class="p">,</span> <span class="n">linestyle</span><span class="o">=</span><span class="s2">&quot;-&quot;</span><span class="p">,</span><span class="n">edgecolor</span><span class="o">=</span><span class="s1">&#39;#20B2AA&#39;</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_feature</span><span class="p">(</span><span class="n">shape_feature</span><span class="p">)</span>
<span class="n">fig</span>
</pre></div>
</div>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Using</span> <span class="mi">208</span> <span class="n">lake</span> <span class="n">MultiPolygons</span>
</pre></div>
</div>
<img alt="../../_images/Map_Resources_and_Topography_25_1.png" src="../../_images/Map_Resources_and_Topography_25_1.png" />
<p><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html">Top</a></p>
</div>
<hr class="docutils" />
<div class="section" id="draw-major-rivers">
<h3>9 Draw Major Rivers<a class="headerlink" href="#draw-major-rivers" title="Permalink to this headline"></a></h3>
<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Define request for rivers</span>
<span class="n">request</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">newDataRequest</span><span class="p">(</span><span class="s1">&#39;maps&#39;</span><span class="p">,</span> <span class="n">envelope</span><span class="o">=</span><span class="n">envelope</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;table&#39;</span><span class="p">,</span> <span class="s1">&#39;mapdata.majorrivers&#39;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;geomField&#39;</span><span class="p">,</span> <span class="s1">&#39;the_geom&#39;</span><span class="p">)</span>
<span class="n">rivers</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">getGeometryData</span><span class="p">(</span><span class="n">request</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Using &quot;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">rivers</span><span class="p">))</span> <span class="o">+</span> <span class="s2">&quot; river MultiLineStrings&quot;</span><span class="p">)</span>
<span class="c1"># Plot rivers</span>
<span class="n">shape_feature</span> <span class="o">=</span> <span class="n">ShapelyFeature</span><span class="p">([</span><span class="n">river</span><span class="o">.</span><span class="n">getGeometry</span><span class="p">()</span> <span class="k">for</span> <span class="n">river</span> <span class="ow">in</span> <span class="n">rivers</span><span class="p">],</span><span class="n">ccrs</span><span class="o">.</span><span class="n">PlateCarree</span><span class="p">(),</span>
<span class="n">facecolor</span><span class="o">=</span><span class="s1">&#39;none&#39;</span><span class="p">,</span> <span class="n">linestyle</span><span class="o">=</span><span class="s2">&quot;:&quot;</span><span class="p">,</span><span class="n">edgecolor</span><span class="o">=</span><span class="s1">&#39;#20B2AA&#39;</span><span class="p">)</span>
<span class="n">ax</span><span class="o">.</span><span class="n">add_feature</span><span class="p">(</span><span class="n">shape_feature</span><span class="p">)</span>
<span class="n">fig</span>
</pre></div>
</div>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Using</span> <span class="mi">1400</span> <span class="n">river</span> <span class="n">MultiLineStrings</span>
</pre></div>
</div>
<img alt="../../_images/Map_Resources_and_Topography_28_1.png" src="../../_images/Map_Resources_and_Topography_28_1.png" />
<p><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html">Top</a></p>
</div>
<hr class="docutils" />
<div class="section" id="draw-topography">
<h3>10 Draw Topography<a class="headerlink" href="#draw-topography" title="Permalink to this headline"></a></h3>
<p>Spatial envelopes are required for topo requests, which can become slow
to download and render for large (CONUS) maps.</p>
<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="c1"># Define topography request</span>
<span class="n">request</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">newDataRequest</span><span class="p">(</span><span class="s2">&quot;topo&quot;</span><span class="p">,</span> <span class="n">envelope</span><span class="o">=</span><span class="n">envelope</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s2">&quot;group&quot;</span><span class="p">,</span> <span class="s2">&quot;/&quot;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s2">&quot;dataset&quot;</span><span class="p">,</span> <span class="s2">&quot;full&quot;</span><span class="p">)</span>
<span class="n">gridData</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">getGridData</span><span class="p">(</span><span class="n">request</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">gridData</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Number of grid records: &quot;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="nb">len</span><span class="p">(</span><span class="n">gridData</span><span class="p">)))</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Sample grid data shape:</span><span class="se">\n</span><span class="s2">&quot;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">gridData</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">getRawData</span><span class="p">()</span><span class="o">.</span><span class="n">shape</span><span class="p">)</span> <span class="o">+</span> <span class="s2">&quot;</span><span class="se">\n</span><span class="s2">&quot;</span><span class="p">)</span>
<span class="nb">print</span><span class="p">(</span><span class="s2">&quot;Sample grid data:</span><span class="se">\n</span><span class="s2">&quot;</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">gridData</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span><span class="o">.</span><span class="n">getRawData</span><span class="p">())</span> <span class="o">+</span> <span class="s2">&quot;</span><span class="se">\n</span><span class="s2">&quot;</span><span class="p">)</span>
</pre></div>
</div>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="p">[</span><span class="o">&lt;</span><span class="n">awips</span><span class="o">.</span><span class="n">dataaccess</span><span class="o">.</span><span class="n">PyGridData</span><span class="o">.</span><span class="n">PyGridData</span> <span class="nb">object</span> <span class="n">at</span> <span class="mh">0x115a20370</span><span class="o">&gt;</span><span class="p">]</span>
<span class="n">Number</span> <span class="n">of</span> <span class="n">grid</span> <span class="n">records</span><span class="p">:</span> <span class="mi">1</span>
<span class="n">Sample</span> <span class="n">grid</span> <span class="n">data</span> <span class="n">shape</span><span class="p">:</span>
<span class="p">(</span><span class="mi">778</span><span class="p">,</span> <span class="mi">1058</span><span class="p">)</span>
<span class="n">Sample</span> <span class="n">grid</span> <span class="n">data</span><span class="p">:</span>
<span class="p">[[</span><span class="mf">1694.</span> <span class="mf">1693.</span> <span class="mf">1688.</span> <span class="o">...</span> <span class="mf">757.</span> <span class="mf">761.</span> <span class="mf">762.</span><span class="p">]</span>
<span class="p">[</span><span class="mf">1701.</span> <span class="mf">1701.</span> <span class="mf">1701.</span> <span class="o">...</span> <span class="mf">758.</span> <span class="mf">760.</span> <span class="mf">762.</span><span class="p">]</span>
<span class="p">[</span><span class="mf">1703.</span> <span class="mf">1703.</span> <span class="mf">1703.</span> <span class="o">...</span> <span class="mf">760.</span> <span class="mf">761.</span> <span class="mf">762.</span><span class="p">]</span>
<span class="o">...</span>
<span class="p">[</span><span class="mf">1767.</span> <span class="mf">1741.</span> <span class="mf">1706.</span> <span class="o">...</span> <span class="mf">769.</span> <span class="mf">762.</span> <span class="mf">768.</span><span class="p">]</span>
<span class="p">[</span><span class="mf">1767.</span> <span class="mf">1746.</span> <span class="mf">1716.</span> <span class="o">...</span> <span class="mf">775.</span> <span class="mf">765.</span> <span class="mf">761.</span><span class="p">]</span>
<span class="p">[</span><span class="mf">1781.</span> <span class="mf">1753.</span> <span class="mf">1730.</span> <span class="o">...</span> <span class="mf">766.</span> <span class="mf">762.</span> <span class="mf">759.</span><span class="p">]]</span>
</pre></div>
</div>
<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">grid</span><span class="o">=</span><span class="n">gridData</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="n">topo</span><span class="o">=</span><span class="n">ma</span><span class="o">.</span><span class="n">masked_invalid</span><span class="p">(</span><span class="n">grid</span><span class="o">.</span><span class="n">getRawData</span><span class="p">())</span>
<span class="n">lons</span><span class="p">,</span> <span class="n">lats</span> <span class="o">=</span> <span class="n">grid</span><span class="o">.</span><span class="n">getLatLonCoords</span><span class="p">()</span>
<span class="nb">print</span><span class="p">(</span><span class="n">topo</span><span class="o">.</span><span class="n">min</span><span class="p">())</span> <span class="c1"># minimum elevation in our domain (meters)</span>
<span class="nb">print</span><span class="p">(</span><span class="n">topo</span><span class="o">.</span><span class="n">max</span><span class="p">())</span> <span class="c1"># maximum elevation in our domain (meters)</span>
<span class="c1"># Plot topography</span>
<span class="n">cs</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">contourf</span><span class="p">(</span><span class="n">lons</span><span class="p">,</span> <span class="n">lats</span><span class="p">,</span> <span class="n">topo</span><span class="p">,</span> <span class="mi">80</span><span class="p">,</span> <span class="n">cmap</span><span class="o">=</span><span class="n">plt</span><span class="o">.</span><span class="n">get_cmap</span><span class="p">(</span><span class="s1">&#39;terrain&#39;</span><span class="p">),</span><span class="n">alpha</span><span class="o">=</span><span class="mf">0.1</span><span class="p">,</span> <span class="n">extend</span><span class="o">=</span><span class="s1">&#39;both&#39;</span><span class="p">)</span>
<span class="n">cbar</span> <span class="o">=</span> <span class="n">fig</span><span class="o">.</span><span class="n">colorbar</span><span class="p">(</span><span class="n">cs</span><span class="p">,</span> <span class="n">shrink</span><span class="o">=</span><span class="mf">0.5</span><span class="p">,</span> <span class="n">orientation</span><span class="o">=</span><span class="s1">&#39;horizontal&#39;</span><span class="p">)</span>
<span class="n">cbar</span><span class="o">.</span><span class="n">set_label</span><span class="p">(</span><span class="s2">&quot;topography height in meters&quot;</span><span class="p">)</span>
<span class="n">fig</span>
</pre></div>
</div>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="mf">623.0</span>
<span class="mf">4328.0</span>
</pre></div>
</div>
<img alt="../../_images/Map_Resources_and_Topography_32_1.png" src="../../_images/Map_Resources_and_Topography_32_1.png" />
<p><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html">Top</a></p>
</div>
<hr class="docutils" />
<div class="section" id="see-also">
<h3>11 See Also<a class="headerlink" href="#see-also" title="Permalink to this headline"></a></h3>
<div class="section" id="additional-documentation">
<h4>11.1 Additional Documentation<a class="headerlink" href="#additional-documentation" title="Permalink to this headline"></a></h4>
<ul>
<li><p>This notebook requires: <strong>python-awips, numpy, matplotplib, cartopy,
shapely</strong></p></li>
<li><p>Use datatype <strong>maps</strong> and <strong>addIdentifier(‘table’, &lt;postgres maps
schema&gt;)</strong> to define the map table:
DataAccessLayer.changeEDEXHost(“edex-cloud.unidata.ucar.edu”) request
= DataAccessLayer.newDataRequest(‘maps’)
request.addIdentifier(‘table’, ‘mapdata.county’)</p></li>
<li><p>Use <strong>request.setLocationNames()</strong> and <strong>request.addIdentifier()</strong> to
spatially filter a map resource. In the example below, WFO ID <strong>BOU</strong>
(Boulder, Colorado) is used to query counties within the BOU county
watch area (CWA)</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;geomField&#39;</span><span class="p">,</span> <span class="s1">&#39;the_geom&#39;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;inLocation&#39;</span><span class="p">,</span> <span class="s1">&#39;true&#39;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;locationField&#39;</span><span class="p">,</span> <span class="s1">&#39;cwa&#39;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">setLocationNames</span><span class="p">(</span><span class="s1">&#39;BOU&#39;</span><span class="p">)</span>
<span class="n">request</span><span class="o">.</span><span class="n">addIdentifier</span><span class="p">(</span><span class="s1">&#39;cwa&#39;</span><span class="p">,</span> <span class="s1">&#39;BOU&#39;</span><span class="p">)</span>
</pre></div>
</div>
</li>
</ul>
<p>See the Maps Database Reference Page for available database tables,
column names, and types.</p>
<p><a class="reference external" href="https://unidata.github.io/python-awips/examples/generated/Map_Resources_and_Topography.html">Top</a></p>
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