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<div class="section" id="awips-grids-and-cartopy">
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<h1>AWIPS Grids and Cartopy<a class="headerlink" href="#awips-grids-and-cartopy" title="Permalink to this headline">¶</a></h1>
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<p><a class="reference external" href="http://nbviewer.ipython.org/github/Unidata/python-awips/blob/master/examples/notebooks/AWIPS_Grids_and_Cartopy.ipynb">Notebook</a>
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A simple example of requesting and plotting AWIPS grids with Matplotlib
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and Cartopy.</p>
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<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>
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<span class="kn">import</span> <span class="nn">cartopy.crs</span> <span class="k">as</span> <span class="nn">ccrs</span>
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<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="k">as</span> <span class="nn">plt</span>
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<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>
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<span class="o">%</span><span class="k">matplotlib</span> inline
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<span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">changeEDEXHost</span><span class="p">(</span><span class="s2">"edex-cloud.unidata.ucar.edu"</span><span class="p">)</span>
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<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>
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<span class="n">request</span><span class="o">.</span><span class="n">setDatatype</span><span class="p">(</span><span class="s2">"grid"</span><span class="p">)</span>
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<span class="n">request</span><span class="o">.</span><span class="n">setLocationNames</span><span class="p">(</span><span class="s2">"RAP13"</span><span class="p">)</span>
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<span class="n">request</span><span class="o">.</span><span class="n">setParameters</span><span class="p">(</span><span class="s2">"T"</span><span class="p">)</span>
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<span class="n">request</span><span class="o">.</span><span class="n">setLevels</span><span class="p">(</span><span class="s2">"2.0FHAG"</span><span class="p">)</span>
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<span class="n">cycles</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">getAvailableTimes</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="kc">True</span><span class="p">)</span>
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<span class="n">times</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">getAvailableTimes</span><span class="p">(</span><span class="n">request</span><span class="p">)</span>
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<span class="n">fcstRun</span> <span class="o">=</span> <span class="n">DataAccessLayer</span><span class="o">.</span><span class="n">getForecastRun</span><span class="p">(</span><span class="n">cycles</span><span class="p">[</span><span class="o">-</span><span class="mi">1</span><span class="p">],</span> <span class="n">times</span><span class="p">)</span>
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<span class="n">response</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="p">[</span><span class="n">fcstRun</span><span class="p">[</span><span class="mi">0</span><span class="p">]])</span>
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<span class="n">grid</span> <span class="o">=</span> <span class="n">response</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
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<span class="n">data</span> <span class="o">=</span> <span class="n">grid</span><span class="o">.</span><span class="n">getRawData</span><span class="p">()</span>
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<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>
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<span class="n">bbox</span> <span class="o">=</span> <span class="p">[</span><span class="n">lons</span><span class="o">.</span><span class="n">min</span><span class="p">(),</span> <span class="n">lons</span><span class="o">.</span><span class="n">max</span><span class="p">(),</span> <span class="n">lats</span><span class="o">.</span><span class="n">min</span><span class="p">(),</span> <span class="n">lats</span><span class="o">.</span><span class="n">max</span><span class="p">()]</span>
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<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>
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<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">16</span><span class="p">,</span> <span class="mi">9</span><span class="p">),</span>
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<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>
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<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>
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<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">'50m'</span><span class="p">)</span>
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<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>
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<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>
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<span class="n">gl</span><span class="o">.</span><span class="n">xformatter</span> <span class="o">=</span> <span class="n">LONGITUDE_FORMATTER</span>
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<span class="n">gl</span><span class="o">.</span><span class="n">yformatter</span> <span class="o">=</span> <span class="n">LATITUDE_FORMATTER</span>
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<span class="k">return</span> <span class="n">fig</span><span class="p">,</span> <span class="n">ax</span>
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</pre></div>
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</div>
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<div class="section" id="with-pcolormesh">
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<h2>with pcolormesh<a class="headerlink" href="#with-pcolormesh" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></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">'rainbow'</span><span class="p">)</span>
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<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>
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<span class="n">cs</span> <span class="o">=</span> <span class="n">ax</span><span class="o">.</span><span class="n">pcolormesh</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">data</span><span class="p">,</span> <span class="n">cmap</span><span class="o">=</span><span class="n">cmap</span><span class="p">)</span>
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<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">0.7</span><span class="p">,</span> <span class="n">orientation</span><span class="o">=</span><span class="s1">'horizontal'</span><span class="p">)</span>
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<span class="n">cbar</span><span class="o">.</span><span class="n">set_label</span><span class="p">(</span><span class="n">grid</span><span class="o">.</span><span class="n">getLocationName</span><span class="p">()</span> <span class="o">+</span><span class="s2">" "</span><span class="o">+</span> <span class="n">grid</span><span class="o">.</span><span class="n">getLevel</span><span class="p">()</span> <span class="o">+</span> <span class="s2">" "</span> \
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<span class="o">+</span> <span class="n">grid</span><span class="o">.</span><span class="n">getParameter</span><span class="p">()</span> <span class="o">+</span> <span class="s2">" ("</span> <span class="o">+</span> <span class="n">grid</span><span class="o">.</span><span class="n">getUnit</span><span class="p">()</span> <span class="o">+</span> <span class="s2">") "</span> \
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<span class="o">+</span> <span class="s2">"valid "</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">grid</span><span class="o">.</span><span class="n">getDataTime</span><span class="p">()</span><span class="o">.</span><span class="n">getRefTime</span><span class="p">()))</span>
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</pre></div>
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</div>
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<img alt="../../_images/AWIPS_Grids_and_Cartopy_3_0.png" src="../../_images/AWIPS_Grids_and_Cartopy_3_0.png" />
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</div>
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<div class="section" id="with-contourf">
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<h2>with contourf<a class="headerlink" href="#with-contourf" title="Permalink to this headline">¶</a></h2>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="n">fig2</span><span class="p">,</span> <span class="n">ax2</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>
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<span class="n">cs2</span> <span class="o">=</span> <span class="n">ax2</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">data</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">cmap</span><span class="p">,</span>
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<span class="n">vmin</span><span class="o">=</span><span class="n">data</span><span class="o">.</span><span class="n">min</span><span class="p">(),</span> <span class="n">vmax</span><span class="o">=</span><span class="n">data</span><span class="o">.</span><span class="n">max</span><span class="p">())</span>
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<span class="n">cbar2</span> <span class="o">=</span> <span class="n">fig2</span><span class="o">.</span><span class="n">colorbar</span><span class="p">(</span><span class="n">cs2</span><span class="p">,</span> <span class="n">shrink</span><span class="o">=</span><span class="mf">0.7</span><span class="p">,</span> <span class="n">orientation</span><span class="o">=</span><span class="s1">'horizontal'</span><span class="p">)</span>
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<span class="n">cbar2</span><span class="o">.</span><span class="n">set_label</span><span class="p">(</span><span class="n">grid</span><span class="o">.</span><span class="n">getLocationName</span><span class="p">()</span> <span class="o">+</span><span class="s2">" "</span><span class="o">+</span> <span class="n">grid</span><span class="o">.</span><span class="n">getLevel</span><span class="p">()</span> <span class="o">+</span> <span class="s2">" "</span> \
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<span class="o">+</span> <span class="n">grid</span><span class="o">.</span><span class="n">getParameter</span><span class="p">()</span> <span class="o">+</span> <span class="s2">" ("</span> <span class="o">+</span> <span class="n">grid</span><span class="o">.</span><span class="n">getUnit</span><span class="p">()</span><span class="o">+</span> <span class="s2">") "</span> \
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<span class="o">+</span> <span class="s2">"valid "</span> <span class="o">+</span> <span class="nb">str</span><span class="p">(</span><span class="n">grid</span><span class="o">.</span><span class="n">getDataTime</span><span class="p">()</span><span class="o">.</span><span class="n">getRefTime</span><span class="p">()))</span>
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</pre></div>
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</div>
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<img alt="../../_images/AWIPS_Grids_and_Cartopy_5_0.png" src="../../_images/AWIPS_Grids_and_Cartopy_5_0.png" />
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