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<div class="section" id="watch-and-warning-polygons">
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<h1>Watch and Warning Polygons<a class="headerlink" href="#watch-and-warning-polygons" 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/Watch_and_Warning_Polygons.ipynb">Notebook</a>
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This example uses matplotlib, cartopy, shapely, and python-awips to plot
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watch and warning polygons requested from a real-time AWIPS EDEX server.</p>
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<p>First, set up our imports and define functions to be used later:</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">from</span> <span class="nn">awips.tables</span> <span class="kn">import</span> <span class="n">vtec</span>
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<span class="kn">from</span> <span class="nn">datetime</span> <span class="kn">import</span> <span class="n">datetime</span>
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<span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</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">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">cartopy.feature</span> <span class="k">as</span> <span class="nn">cfeature</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="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>
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<span class="kn">from</span> <span class="nn">shapely.geometry</span> <span class="kn">import</span> <span class="n">MultiPolygon</span><span class="p">,</span><span class="n">Polygon</span>
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<span class="k">def</span> <span class="nf">warning_color</span><span class="p">(</span><span class="n">phensig</span><span class="p">):</span>
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<span class="k">return</span> <span class="n">vtec</span><span class="p">[</span><span class="n">phensig</span><span class="p">][</span><span class="s1">'color'</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">20</span><span class="p">,</span><span class="mi">12</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">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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<p>Next, we create a request for the “warning” data type:</p>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><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">"warning"</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="s1">'phensig'</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="c1"># Get records for last 50 available times</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">getGeometryData</span><span class="p">(</span><span class="n">request</span><span class="p">,</span> <span class="n">times</span><span class="p">[</span><span class="o">-</span><span class="mi">50</span><span class="p">:</span><span class="o">-</span><span class="mi">1</span><span class="p">])</span>
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<span class="nb">print</span><span class="p">(</span><span class="s2">"Using "</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">" records"</span><span class="p">)</span>
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<span class="c1"># Each record will have a numpy array the length of the number of "parameters"</span>
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<span class="c1"># Default is 1 (request.setParameters('phensig'))</span>
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<span class="n">parameters</span> <span class="o">=</span> <span class="p">{}</span>
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<span class="k">for</span> <span class="n">x</span> <span class="ow">in</span> <span class="n">request</span><span class="o">.</span><span class="n">getParameters</span><span class="p">():</span>
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<span class="n">parameters</span><span class="p">[</span><span class="n">x</span><span class="p">]</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([])</span>
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<span class="nb">print</span><span class="p">(</span><span class="n">parameters</span><span class="p">)</span>
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</pre></div>
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</div>
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<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">Using</span> <span class="mi">109</span> <span class="n">records</span>
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<span class="p">{</span><span class="s1">'phensig'</span><span class="p">:</span> <span class="n">array</span><span class="p">([],</span> <span class="n">dtype</span><span class="o">=</span><span class="n">float64</span><span class="p">)}</span>
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</pre></div>
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</div>
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<p>Now loop through each record and plot it as either Polygon or
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MultiPolygon, with appropriate colors</p>
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<div class="highlight-ipython3 notranslate"><div class="highlight"><pre><span></span><span class="o">%</span><span class="k">matplotlib</span> inline
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<span class="n">bbox</span><span class="o">=</span><span class="p">[</span><span class="o">-</span><span class="mi">127</span><span class="p">,</span><span class="o">-</span><span class="mi">64</span><span class="p">,</span><span class="mi">24</span><span class="p">,</span><span class="mi">49</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">siteids</span><span class="o">=</span><span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([])</span>
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<span class="n">periods</span><span class="o">=</span><span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([])</span>
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<span class="n">reftimes</span><span class="o">=</span><span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([])</span>
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<span class="k">for</span> <span class="n">ob</span> <span class="ow">in</span> <span class="n">response</span><span class="p">:</span>
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<span class="n">poly</span> <span class="o">=</span> <span class="n">ob</span><span class="o">.</span><span class="n">getGeometry</span><span class="p">()</span>
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<span class="n">site</span> <span class="o">=</span> <span class="n">ob</span><span class="o">.</span><span class="n">getLocationName</span><span class="p">()</span>
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<span class="n">pd</span> <span class="o">=</span> <span class="n">ob</span><span class="o">.</span><span class="n">getDataTime</span><span class="p">()</span><span class="o">.</span><span class="n">getValidPeriod</span><span class="p">()</span>
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<span class="n">ref</span> <span class="o">=</span> <span class="n">ob</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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<span class="c1"># do not plot if phensig is blank (SPS)</span>
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<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="s1">'phensig'</span><span class="p">):</span>
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<span class="n">phensigString</span> <span class="o">=</span> <span class="n">ob</span><span class="o">.</span><span class="n">getString</span><span class="p">(</span><span class="s1">'phensig'</span><span class="p">)</span>
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<span class="n">siteids</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">siteids</span><span class="p">,</span><span class="n">site</span><span class="p">)</span>
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<span class="n">periods</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">periods</span><span class="p">,</span><span class="n">pd</span><span class="p">)</span>
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<span class="n">reftimes</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">reftimes</span><span class="p">,</span><span class="n">ref</span><span class="p">)</span>
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<span class="k">for</span> <span class="n">parm</span> <span class="ow">in</span> <span class="n">parameters</span><span class="p">:</span>
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<span class="n">parameters</span><span class="p">[</span><span class="n">parm</span><span class="p">]</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">parameters</span><span class="p">[</span><span class="n">parm</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="n">parm</span><span class="p">))</span>
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<span class="k">if</span> <span class="n">poly</span><span class="o">.</span><span class="n">geom_type</span> <span class="o">==</span> <span class="s1">'MultiPolygon'</span><span class="p">:</span>
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<span class="n">geometries</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([])</span>
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<span class="n">geometries</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">geometries</span><span class="p">,</span><span class="n">MultiPolygon</span><span class="p">(</span><span class="n">poly</span><span class="p">))</span>
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<span class="n">geom_count</span> <span class="o">=</span> <span class="s2">", "</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">geometries</span><span class="p">))</span> <span class="o">+</span><span class="s2">" geometries"</span>
|
|
<span class="k">else</span><span class="p">:</span>
|
|
<span class="n">geometries</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">array</span><span class="p">([])</span>
|
|
<span class="n">geometries</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">append</span><span class="p">(</span><span class="n">geometries</span><span class="p">,</span><span class="n">Polygon</span><span class="p">(</span><span class="n">poly</span><span class="p">))</span>
|
|
<span class="n">geom_count</span><span class="o">=</span><span class="s2">""</span>
|
|
|
|
<span class="k">for</span> <span class="n">geom</span> <span class="ow">in</span> <span class="n">geometries</span><span class="p">:</span>
|
|
<span class="n">bounds</span> <span class="o">=</span> <span class="n">Polygon</span><span class="p">(</span><span class="n">geom</span><span class="p">)</span>
|
|
<span class="n">intersection</span> <span class="o">=</span> <span class="n">bounds</span><span class="o">.</span><span class="n">intersection</span>
|
|
<span class="n">geoms</span> <span class="o">=</span> <span class="p">(</span><span class="n">intersection</span><span class="p">(</span><span class="n">geom</span><span class="p">)</span>
|
|
<span class="k">for</span> <span class="n">geom</span> <span class="ow">in</span> <span class="n">geometries</span>
|
|
<span class="k">if</span> <span class="n">bounds</span><span class="o">.</span><span class="n">intersects</span><span class="p">(</span><span class="n">geom</span><span class="p">))</span>
|
|
|
|
<span class="c1">#print(vtec[phensigString]['hdln']</span>
|
|
<span class="c1"># + " (" + phensigString + ") issued at " + str(ref)</span>
|
|
<span class="c1"># + " ("+str(poly.geom_type) + geom_count + ")")</span>
|
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|
<span class="n">color</span> <span class="o">=</span> <span class="n">warning_color</span><span class="p">(</span><span class="n">phensigString</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">geoms</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="n">color</span><span class="p">,</span> <span class="n">edgecolor</span><span class="o">=</span><span class="n">color</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">states_provinces</span> <span class="o">=</span> <span class="n">cfeature</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">'cultural'</span><span class="p">,</span>
|
|
<span class="n">name</span><span class="o">=</span><span class="s1">'admin_1_states_provinces_lines'</span><span class="p">,</span>
|
|
<span class="n">scale</span><span class="o">=</span><span class="s1">'50m'</span><span class="p">,</span>
|
|
<span class="n">facecolor</span><span class="o">=</span><span class="s1">'none'</span><span class="p">)</span>
|
|
<span class="n">political_boundaries</span> <span class="o">=</span> <span class="n">cfeature</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">'cultural'</span><span class="p">,</span>
|
|
<span class="n">name</span><span class="o">=</span><span class="s1">'admin_0_boundary_lines_land'</span><span class="p">,</span>
|
|
<span class="n">scale</span><span class="o">=</span><span class="s1">'50m'</span><span class="p">,</span> <span class="n">facecolor</span><span class="o">=</span><span class="s1">'none'</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">cfeature</span><span class="o">.</span><span class="n">LAND</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">cfeature</span><span class="o">.</span><span class="n">COASTLINE</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_provinces</span><span class="p">,</span> <span class="n">edgecolor</span><span class="o">=</span><span class="s1">'black'</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">edgecolor</span><span class="o">=</span><span class="s1">'black'</span><span class="p">)</span>
|
|
|
|
<span class="n">plt</span><span class="o">.</span><span class="n">show</span><span class="p">()</span>
|
|
</pre></div>
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<img alt="../../_images/Watch_and_Warning_Polygons_5_0.png" src="../../_images/Watch_and_Warning_Polygons_5_0.png" />
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