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  <div class="section" id="plotting-with-pyresample-and-basemap">
<span id="plot"></span><h1>Plotting with pyresample and Basemap<a class="headerlink" href="#plotting-with-pyresample-and-basemap" title="Permalink to this headline"></a></h1>
<p>Pyresample supports basic integration with Basemap (<a class="reference external" href="http://matplotlib.sourceforge.net/basemap">http://matplotlib.sourceforge.net/basemap</a>).</p>
<div class="section" id="displaying-data-quickly">
<h2>Displaying data quickly<a class="headerlink" href="#displaying-data-quickly" title="Permalink to this headline"></a></h2>
<p>Pyresample has some convenience functions for displaying data from a single channel.
The function <strong>plot.show_quicklook</strong> shows a Basemap image of a dataset for a specified AreaDefinition.
The function <strong>plot.save_quicklook</strong> saves the Basemap image directly to file.</p>
<p><strong>Example usage:</strong></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">pyresample</span> <span class="k">import</span> <span class="n">load_area</span><span class="p">,</span> <span class="n">save_quicklook</span><span class="p">,</span> <span class="n">SwathDefinition</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">pyresample.kd_tree</span> <span class="k">import</span> <span class="n">resample_nearest</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">lons</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">zeros</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">lats</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="o">-</span><span class="mi">80</span><span class="p">,</span> <span class="o">-</span><span class="mi">90</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.01</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">tb37v</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">area_def</span> <span class="o">=</span> <span class="n">load_area</span><span class="p">(</span><span class="s1">&#39;areas.cfg&#39;</span><span class="p">,</span> <span class="s1">&#39;ease_sh&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">swath_def</span> <span class="o">=</span> <span class="n">SwathDefinition</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="gp">&gt;&gt;&gt; </span><span class="n">result</span> <span class="o">=</span> <span class="n">resample_nearest</span><span class="p">(</span><span class="n">swath_def</span><span class="p">,</span> <span class="n">tb37v</span><span class="p">,</span> <span class="n">area_def</span><span class="p">,</span>
<span class="gp">... </span>                          <span class="n">radius_of_influence</span><span class="o">=</span><span class="mi">20000</span><span class="p">,</span> <span class="n">fill_value</span><span class="o">=</span><span class="kc">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">save_quicklook</span><span class="p">(</span><span class="s1">&#39;tb37v_quick.png&#39;</span><span class="p">,</span> <span class="n">area_def</span><span class="p">,</span> <span class="n">result</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s1">&#39;Tb 37v (K)&#39;</span><span class="p">)</span>
</pre></div>
</div>
<dl class="docutils">
<dt>Assuming <strong>lons</strong>, <strong>lats</strong> and <strong>tb37v</strong> are initialized with real data the result might look something like this:</dt>
<dd><img alt="_images/tb37v_quick.png" class="first last" src="_images/tb37v_quick.png" />
</dd>
</dl>
<p>The data passed to the functions is a 2D array matching the AreaDefinition.</p>
<div class="section" id="the-plate-carree-projection">
<h3>The Plate Carree projection<a class="headerlink" href="#the-plate-carree-projection" title="Permalink to this headline"></a></h3>
<p>The Plate Carree projection (regular lon/lat grid) is named <strong>eqc</strong> in Proj.4 and <strong>cyl</strong> in Basemap. pyresample uses the Proj.4 name.
Assuming the file <strong>areas.cfg</strong> has the following area definition:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>REGION: pc_world <span class="o">{</span>
   NAME:    Plate Carree world map
   PCS_ID:  pc_world
   PCS_DEF: <span class="nv">proj</span><span class="o">=</span>eqc
   XSIZE: <span class="m">640</span>
   YSIZE: <span class="m">480</span>
   AREA_EXTENT:  <span class="o">(</span>-20037508.34, -10018754.17, <span class="m">20037508</span>.34, <span class="m">10018754</span>.17<span class="o">)</span>
<span class="o">}</span><span class="p">;</span>
</pre></div>
</div>
<p><strong>Example usage:</strong></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">pyresample</span> <span class="k">import</span> <span class="n">load_area</span><span class="p">,</span> <span class="n">save_quicklook</span><span class="p">,</span> <span class="n">SwathDefinition</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">pyresample.kd_tree</span> <span class="k">import</span> <span class="n">resample_nearest</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">lons</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">zeros</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">lats</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="o">-</span><span class="mi">80</span><span class="p">,</span> <span class="o">-</span><span class="mi">90</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.01</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">tb37v</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">area_def</span> <span class="o">=</span> <span class="n">load_area</span><span class="p">(</span><span class="s1">&#39;areas.cfg&#39;</span><span class="p">,</span> <span class="s1">&#39;pc_world&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">swath_def</span> <span class="o">=</span> <span class="n">SwathDefinition</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="gp">&gt;&gt;&gt; </span><span class="n">result</span> <span class="o">=</span> <span class="n">resample_nearest</span><span class="p">(</span><span class="n">swath_def</span><span class="p">,</span> <span class="n">tb37v</span><span class="p">,</span> <span class="n">area_def</span><span class="p">,</span> <span class="n">radius_of_influence</span><span class="o">=</span><span class="mi">20000</span><span class="p">,</span> <span class="n">fill_value</span><span class="o">=</span><span class="kc">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">save_quicklook</span><span class="p">(</span><span class="s1">&#39;tb37v_pc.png&#39;</span><span class="p">,</span> <span class="n">area_def</span><span class="p">,</span> <span class="n">result</span><span class="p">,</span> <span class="n">num_meridians</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">num_parallels</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s1">&#39;Tb 37v (K)&#39;</span><span class="p">)</span>
</pre></div>
</div>
<dl class="docutils">
<dt>Assuming <strong>lons</strong>, <strong>lats</strong> and <strong>tb37v</strong> are initialized with real data the result might look something like this:</dt>
<dd><img alt="_images/tb37v_pc.png" class="first last" src="_images/tb37v_pc.png" />
</dd>
</dl>
</div>
<div class="section" id="the-globe-projections">
<h3>The Globe projections<a class="headerlink" href="#the-globe-projections" title="Permalink to this headline"></a></h3>
<p>From v0.7.12 pyresample can use the geos, ortho and nsper projections with Basemap.
Assuming the file <strong>areas.cfg</strong> has the following area definition for an ortho projection area:</p>
<div class="highlight-bash"><div class="highlight"><pre><span></span>REGION: ortho <span class="o">{</span>
  NAME:    Ortho globe
  PCS_ID:  ortho_globe
  PCS_DEF: <span class="nv">proj</span><span class="o">=</span>ortho, <span class="nv">a</span><span class="o">=</span><span class="m">6370997</span>.0, <span class="nv">lon_0</span><span class="o">=</span><span class="m">40</span>, <span class="nv">lat_0</span><span class="o">=</span>-40
  XSIZE: <span class="m">640</span>
  YSIZE: <span class="m">480</span>
  AREA_EXTENT:  <span class="o">(</span>-10000000, -10000000, <span class="m">10000000</span>, <span class="m">10000000</span><span class="o">)</span>
<span class="o">}</span><span class="p">;</span>
</pre></div>
</div>
<p><strong>Example usage:</strong></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">pyresample</span> <span class="k">import</span> <span class="n">load_area</span><span class="p">,</span> <span class="n">save_quicklook</span><span class="p">,</span> <span class="n">SwathDefinition</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">pyresample.kd_tree</span> <span class="k">import</span> <span class="n">resample_nearest</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">lons</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">zeros</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">lats</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="o">-</span><span class="mi">80</span><span class="p">,</span> <span class="o">-</span><span class="mi">90</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.01</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">tb37v</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">area_def</span> <span class="o">=</span> <span class="n">load_area</span><span class="p">(</span><span class="s1">&#39;areas.cfg&#39;</span><span class="p">,</span> <span class="s1">&#39;ortho&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">swath_def</span> <span class="o">=</span> <span class="n">SwathDefinition</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="gp">&gt;&gt;&gt; </span><span class="n">result</span> <span class="o">=</span> <span class="n">resample_nearest</span><span class="p">(</span><span class="n">swath_def</span><span class="p">,</span> <span class="n">tb37v</span><span class="p">,</span> <span class="n">area_def</span><span class="p">,</span> <span class="n">radius_of_influence</span><span class="o">=</span><span class="mi">20000</span><span class="p">,</span> <span class="n">fill_value</span><span class="o">=</span><span class="kc">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">save_quicklook</span><span class="p">(</span><span class="s1">&#39;tb37v_ortho.png&#39;</span><span class="p">,</span> <span class="n">area_def</span><span class="p">,</span> <span class="n">result</span><span class="p">,</span> <span class="n">num_meridians</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">num_parallels</span><span class="o">=</span><span class="mi">0</span><span class="p">,</span> <span class="n">label</span><span class="o">=</span><span class="s1">&#39;Tb 37v (K)&#39;</span><span class="p">)</span>
</pre></div>
</div>
<dl class="docutils">
<dt>Assuming <strong>lons</strong>, <strong>lats</strong> and <strong>tb37v</strong> are initialized with real data the result might look something like this:</dt>
<dd><img alt="_images/tb37v_ortho.png" class="first last" src="_images/tb37v_ortho.png" />
</dd>
</dl>
</div>
</div>
<div class="section" id="getting-a-basemap-object">
<h2>Getting a Basemap object<a class="headerlink" href="#getting-a-basemap-object" title="Permalink to this headline"></a></h2>
<p>In order to make more advanced plots than the preconfigured quicklooks a Basemap object can be generated from an
AreaDefintion using the <strong>plot.area_def2basemap(area_def, **kwargs)</strong> function.</p>
<p><strong>Example usage:</strong></p>
<div class="highlight-default"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">numpy</span> <span class="k">as</span> <span class="nn">np</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="k">as</span> <span class="nn">plt</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">pyresample</span> <span class="k">import</span> <span class="n">load_area</span><span class="p">,</span> <span class="n">save_quicklook</span><span class="p">,</span> <span class="n">area_def2basemap</span><span class="p">,</span> <span class="n">SwathDefinition</span>
<span class="gp">&gt;&gt;&gt; </span><span class="kn">from</span> <span class="nn">pyresample.kd_tree</span> <span class="k">import</span> <span class="n">resample_nearest</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">lons</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">zeros</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">lats</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="o">-</span><span class="mi">80</span><span class="p">,</span> <span class="o">-</span><span class="mi">90</span><span class="p">,</span> <span class="o">-</span><span class="mf">0.01</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">tb37v</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mi">1000</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">area_def</span> <span class="o">=</span> <span class="n">load_area</span><span class="p">(</span><span class="s1">&#39;areas.cfg&#39;</span><span class="p">,</span> <span class="s1">&#39;ease_sh&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">swath_def</span> <span class="o">=</span> <span class="n">SwathDefinition</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="gp">&gt;&gt;&gt; </span><span class="n">result</span> <span class="o">=</span> <span class="n">resample_nearest</span><span class="p">(</span><span class="n">swath_def</span><span class="p">,</span> <span class="n">tb37v</span><span class="p">,</span> <span class="n">area_def</span><span class="p">,</span>
<span class="gp">... </span>                          <span class="n">radius_of_influence</span><span class="o">=</span><span class="mi">20000</span><span class="p">,</span> <span class="n">fill_value</span><span class="o">=</span><span class="kc">None</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">bmap</span> <span class="o">=</span> <span class="n">area_def2basemap</span><span class="p">(</span><span class="n">area_def</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">bmng</span> <span class="o">=</span> <span class="n">bmap</span><span class="o">.</span><span class="n">bluemarble</span><span class="p">()</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">col</span> <span class="o">=</span> <span class="n">bmap</span><span class="o">.</span><span class="n">imshow</span><span class="p">(</span><span class="n">result</span><span class="p">,</span> <span class="n">origin</span><span class="o">=</span><span class="s1">&#39;upper&#39;</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">plt</span><span class="o">.</span><span class="n">savefig</span><span class="p">(</span><span class="s1">&#39;tb37v_bmng.png&#39;</span><span class="p">,</span> <span class="n">bbox_inches</span><span class="o">=</span><span class="s1">&#39;tight&#39;</span><span class="p">)</span>
</pre></div>
</div>
<dl class="docutils">
<dt>Assuming <strong>lons</strong>, <strong>lats</strong> and <strong>tb37v</strong> are initialized with real data the result might look something like this:</dt>
<dd><img alt="_images/tb37v_bmng.png" class="first last" src="_images/tb37v_bmng.png" />
</dd>
</dl>
<p>Any keyword arguments (not concerning the projection) passed to <strong>plot.area_def2basemap</strong> will be passed
directly to the Basemap initialization.</p>
<p>For more information on how to plot with Basemap please refer to the Basemap and matplotlib documentation.</p>
</div>
<div class="section" id="limitations">
<h2>Limitations<a class="headerlink" href="#limitations" title="Permalink to this headline"></a></h2>
<p>The pyresample use of Basemap is basically a conversion from a pyresample AreaDefintion to a Basemap object
which allows for correct plotting of a resampled dataset using the <strong>basemap.imshow</strong> function.</p>
<p>Currently only the following set of Proj.4 arguments can be interpreted in the conversion:
{‘proj’, ‘a’, ‘b’, ‘ellps’, ‘lon_0’, ‘lat_0’, ‘lon_1’, ‘lat_1’, ‘lon_2’, ‘lat_2’, ‘lat_ts’}</p>
<p>Any other Proj.4 parameters will be ignored.
If the ellipsoid is not defined in terms of ‘ellps’, ‘a’ or (‘a’, ‘b’) it will default to WGS84.</p>
<p>The xsize and ysize in an AreaDefinition will only be used during resampling when the image data for use in
<strong>basemap.imshow</strong> is created. The actual size and shape of the final plot is handled by matplotlib.</p>
</div>
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<li><a class="reference internal" href="#">Plotting with pyresample and Basemap</a><ul>
<li><a class="reference internal" href="#displaying-data-quickly">Displaying data quickly</a><ul>
<li><a class="reference internal" href="#the-plate-carree-projection">The Plate Carree projection</a></li>
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