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  <div class="section" id="resampling-of-gridded-data">
<h1>Resampling of gridded data<a class="headerlink" href="#resampling-of-gridded-data" title="Permalink to this headline"></a></h1>
<p>Pyresample can be used to resample from an existing grid to another. Nearest neighbour resampling is used.</p>
<div class="section" id="pyresample-image">
<h2>pyresample.image<a class="headerlink" href="#pyresample-image" title="Permalink to this headline"></a></h2>
<p>A grid can be stored in an object of type <strong>ImageContainer</strong> along with its area definition.
An object of type <strong>ImageContainer</strong> allows for calculating resampling using preprocessed arrays
using the method <strong>get_array_from_linesample</strong></p>
<p>Resampling can be done using descendants of <strong>ImageContainer</strong> and calling their <strong>resample</strong> method.</p>
<p>An <strong>ImageContainerQuick</strong> object allows for the grid to be resampled to a new area defintion
using an approximate (but fast) nearest neighbour method.
Resampling an object of type <strong>ImageContainerQuick</strong> returns a new object of type <strong>ImageContainerQuick</strong>.</p>
<p>An <strong>ImageContainerNearest</strong> object allows for the grid to be resampled to a new area defintion (or swath definition)
using an accurate kd-tree method.
Resampling an object of type <strong>ImageContainerNearest</strong> returns a new object of
type <strong>ImageContainerNearest</strong>.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">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="kn">import</span> <span class="n">image</span><span class="p">,</span> <span class="n">geometry</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">area_def</span> <span class="o">=</span> <span class="n">geometry</span><span class="o">.</span><span class="n">AreaDefinition</span><span class="p">(</span><span class="s">&#39;areaD&#39;</span><span class="p">,</span> <span class="s">&#39;Europe (3km, HRV, VTC)&#39;</span><span class="p">,</span> <span class="s">&#39;areaD&#39;</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="p">{</span><span class="s">&#39;a&#39;</span><span class="p">:</span> <span class="s">&#39;6378144.0&#39;</span><span class="p">,</span> <span class="s">&#39;b&#39;</span><span class="p">:</span> <span class="s">&#39;6356759.0&#39;</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="s">&#39;lat_0&#39;</span><span class="p">:</span> <span class="s">&#39;50.00&#39;</span><span class="p">,</span> <span class="s">&#39;lat_ts&#39;</span><span class="p">:</span> <span class="s">&#39;50.00&#39;</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="s">&#39;lon_0&#39;</span><span class="p">:</span> <span class="s">&#39;8.00&#39;</span><span class="p">,</span> <span class="s">&#39;proj&#39;</span><span class="p">:</span> <span class="s">&#39;stere&#39;</span><span class="p">},</span>
<span class="gp">... </span>                               <span class="mi">800</span><span class="p">,</span> <span class="mi">800</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="p">[</span><span class="o">-</span><span class="mf">1370912.72</span><span class="p">,</span> <span class="o">-</span><span class="mf">909968.64</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="mf">1029087.28</span><span class="p">,</span> <span class="mf">1490031.36</span><span class="p">])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">msg_area</span> <span class="o">=</span> <span class="n">geometry</span><span class="o">.</span><span class="n">AreaDefinition</span><span class="p">(</span><span class="s">&#39;msg_full&#39;</span><span class="p">,</span> <span class="s">&#39;Full globe MSG image 0 degrees&#39;</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="s">&#39;msg_full&#39;</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="p">{</span><span class="s">&#39;a&#39;</span><span class="p">:</span> <span class="s">&#39;6378169.0&#39;</span><span class="p">,</span> <span class="s">&#39;b&#39;</span><span class="p">:</span> <span class="s">&#39;6356584.0&#39;</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="s">&#39;h&#39;</span><span class="p">:</span> <span class="s">&#39;35785831.0&#39;</span><span class="p">,</span> <span class="s">&#39;lon_0&#39;</span><span class="p">:</span> <span class="s">&#39;0&#39;</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="s">&#39;proj&#39;</span><span class="p">:</span> <span class="s">&#39;geos&#39;</span><span class="p">},</span>
<span class="gp">... </span>                               <span class="mi">3712</span><span class="p">,</span> <span class="mi">3712</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="p">[</span><span class="o">-</span><span class="mf">5568742.4</span><span class="p">,</span> <span class="o">-</span><span class="mf">5568742.4</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="mf">5568742.4</span><span class="p">,</span> <span class="mf">5568742.4</span><span class="p">])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">data</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">ones</span><span class="p">((</span><span class="mi">3712</span><span class="p">,</span> <span class="mi">3712</span><span class="p">))</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">msg_con_quick</span> <span class="o">=</span> <span class="n">image</span><span class="o">.</span><span class="n">ImageContainerQuick</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">msg_area</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">area_con_quick</span> <span class="o">=</span> <span class="n">msg_con_quick</span><span class="o">.</span><span class="n">resample</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">result_data_quick</span> <span class="o">=</span> <span class="n">area_con_quick</span><span class="o">.</span><span class="n">image_data</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">msg_con_nn</span> <span class="o">=</span> <span class="n">image</span><span class="o">.</span><span class="n">ImageContainerNearest</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">msg_area</span><span class="p">,</span> <span class="n">radius_of_influence</span><span class="o">=</span><span class="mi">50000</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">area_con_nn</span> <span class="o">=</span> <span class="n">msg_con_nn</span><span class="o">.</span><span class="n">resample</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">result_data_nn</span> <span class="o">=</span> <span class="n">area_con_nn</span><span class="o">.</span><span class="n">image_data</span>
</pre></div>
</div>
<p>Data is assumed to be a numpy array of shape (rows, cols) or (rows, cols, channels).</p>
<p>Masked arrays can be used as data input. In order to have undefined pixels masked out instead of
assigned a fill value set <strong>fill_value=None</strong> when calling <strong>resample_area_*</strong>.</p>
<p>Using <strong>ImageContainerQuick</strong> the risk of image artifacts increases as the distance
from source projection center increases.</p>
<p>The constructor argument <strong>radius_of_influence</strong> to <strong>ImageContainerNearest</strong> specifices the maximum
distance to search for a neighbour for each point in the target grid. The unit is meters.</p>
<p>The constructor arguments of an ImageContainer object can be changed as attributes later</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">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="kn">import</span> <span class="n">image</span><span class="p">,</span> <span class="n">geometry</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">msg_area</span> <span class="o">=</span> <span class="n">geometry</span><span class="o">.</span><span class="n">AreaDefinition</span><span class="p">(</span><span class="s">&#39;msg_full&#39;</span><span class="p">,</span> <span class="s">&#39;Full globe MSG image 0 degrees&#39;</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="s">&#39;msg_full&#39;</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="p">{</span><span class="s">&#39;a&#39;</span><span class="p">:</span> <span class="s">&#39;6378169.0&#39;</span><span class="p">,</span> <span class="s">&#39;b&#39;</span><span class="p">:</span> <span class="s">&#39;6356584.0&#39;</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="s">&#39;h&#39;</span><span class="p">:</span> <span class="s">&#39;35785831.0&#39;</span><span class="p">,</span> <span class="s">&#39;lon_0&#39;</span><span class="p">:</span> <span class="s">&#39;0&#39;</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="s">&#39;proj&#39;</span><span class="p">:</span> <span class="s">&#39;geos&#39;</span><span class="p">},</span>
<span class="gp">... </span>                               <span class="mi">3712</span><span class="p">,</span> <span class="mi">3712</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="p">[</span><span class="o">-</span><span class="mf">5568742.4</span><span class="p">,</span> <span class="o">-</span><span class="mf">5568742.4</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="mf">5568742.4</span><span class="p">,</span> <span class="mf">5568742.4</span><span class="p">])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">data</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">ones</span><span class="p">((</span><span class="mi">3712</span><span class="p">,</span> <span class="mi">3712</span><span class="p">))</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">msg_con_nn</span> <span class="o">=</span> <span class="n">image</span><span class="o">.</span><span class="n">ImageContainerNearest</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">msg_area</span><span class="p">,</span> <span class="n">radius_of_influence</span><span class="o">=</span><span class="mi">50000</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">msg_con_nn</span><span class="o">.</span><span class="n">radius_of_influence</span> <span class="o">=</span> <span class="mi">45000</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">msg_con_nn</span><span class="o">.</span><span class="n">fill_value</span> <span class="o">=</span> <span class="o">-</span><span class="mi">99</span>
</pre></div>
</div>
<div class="section" id="multi-channel-images">
<h3>Multi channel images<a class="headerlink" href="#multi-channel-images" title="Permalink to this headline"></a></h3>
<p>If the dataset has several channels the last index of the data array specifies the channels</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">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="kn">import</span> <span class="n">image</span><span class="p">,</span> <span class="n">geometry</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">msg_area</span> <span class="o">=</span> <span class="n">geometry</span><span class="o">.</span><span class="n">AreaDefinition</span><span class="p">(</span><span class="s">&#39;msg_full&#39;</span><span class="p">,</span> <span class="s">&#39;Full globe MSG image 0 degrees&#39;</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="s">&#39;msg_full&#39;</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="p">{</span><span class="s">&#39;a&#39;</span><span class="p">:</span> <span class="s">&#39;6378169.0&#39;</span><span class="p">,</span> <span class="s">&#39;b&#39;</span><span class="p">:</span> <span class="s">&#39;6356584.0&#39;</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="s">&#39;h&#39;</span><span class="p">:</span> <span class="s">&#39;35785831.0&#39;</span><span class="p">,</span> <span class="s">&#39;lon_0&#39;</span><span class="p">:</span> <span class="s">&#39;0&#39;</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="s">&#39;proj&#39;</span><span class="p">:</span> <span class="s">&#39;geos&#39;</span><span class="p">},</span>
<span class="gp">... </span>                               <span class="mi">3712</span><span class="p">,</span> <span class="mi">3712</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="p">[</span><span class="o">-</span><span class="mf">5568742.4</span><span class="p">,</span> <span class="o">-</span><span class="mf">5568742.4</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="mf">5568742.4</span><span class="p">,</span> <span class="mf">5568742.4</span><span class="p">])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">channel1</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">ones</span><span class="p">((</span><span class="mi">3712</span><span class="p">,</span> <span class="mi">3712</span><span class="p">))</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">channel2</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">ones</span><span class="p">((</span><span class="mi">3712</span><span class="p">,</span> <span class="mi">3712</span><span class="p">))</span> <span class="o">*</span> <span class="mi">2</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">channel3</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">ones</span><span class="p">((</span><span class="mi">3712</span><span class="p">,</span> <span class="mi">3712</span><span class="p">))</span> <span class="o">*</span> <span class="mi">3</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">data</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">dstack</span><span class="p">((</span><span class="n">channel1</span><span class="p">,</span> <span class="n">channel2</span><span class="p">,</span> <span class="n">channel3</span><span class="p">))</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">msg_con_nn</span> <span class="o">=</span> <span class="n">image</span><span class="o">.</span><span class="n">ImageContainerNearest</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">msg_area</span><span class="p">,</span> <span class="n">radius_of_influence</span><span class="o">=</span><span class="mi">50000</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="segmented-resampling">
<h3>Segmented resampling<a class="headerlink" href="#segmented-resampling" title="Permalink to this headline"></a></h3>
<p>Pyresample calculates the result in segments in order to reduce memory footprint. This is controlled by the <strong>segments</strong> contructor keyword argument. If no <strong>segments</strong> argument is given pyresample will estimate the number of segments to use.</p>
<p>Forcing quick resampling to use 4 resampling segments:</p>
<div class="highlight-python"><div class="highlight"><pre><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">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="kn">import</span> <span class="n">image</span><span class="p">,</span> <span class="n">geometry</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">area_def</span> <span class="o">=</span> <span class="n">geometry</span><span class="o">.</span><span class="n">AreaDefinition</span><span class="p">(</span><span class="s">&#39;areaD&#39;</span><span class="p">,</span> <span class="s">&#39;Europe (3km, HRV, VTC)&#39;</span><span class="p">,</span> <span class="s">&#39;areaD&#39;</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="p">{</span><span class="s">&#39;a&#39;</span><span class="p">:</span> <span class="s">&#39;6378144.0&#39;</span><span class="p">,</span> <span class="s">&#39;b&#39;</span><span class="p">:</span> <span class="s">&#39;6356759.0&#39;</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="s">&#39;lat_0&#39;</span><span class="p">:</span> <span class="s">&#39;50.00&#39;</span><span class="p">,</span> <span class="s">&#39;lat_ts&#39;</span><span class="p">:</span> <span class="s">&#39;50.00&#39;</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="s">&#39;lon_0&#39;</span><span class="p">:</span> <span class="s">&#39;8.00&#39;</span><span class="p">,</span> <span class="s">&#39;proj&#39;</span><span class="p">:</span> <span class="s">&#39;stere&#39;</span><span class="p">},</span>
<span class="gp">... </span>                               <span class="mi">800</span><span class="p">,</span> <span class="mi">800</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="p">[</span><span class="o">-</span><span class="mf">1370912.72</span><span class="p">,</span> <span class="o">-</span><span class="mf">909968.64</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="mf">1029087.28</span><span class="p">,</span> <span class="mf">1490031.36</span><span class="p">])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">msg_area</span> <span class="o">=</span> <span class="n">geometry</span><span class="o">.</span><span class="n">AreaDefinition</span><span class="p">(</span><span class="s">&#39;msg_full&#39;</span><span class="p">,</span> <span class="s">&#39;Full globe MSG image 0 degrees&#39;</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="s">&#39;msg_full&#39;</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="p">{</span><span class="s">&#39;a&#39;</span><span class="p">:</span> <span class="s">&#39;6378169.0&#39;</span><span class="p">,</span> <span class="s">&#39;b&#39;</span><span class="p">:</span> <span class="s">&#39;6356584.0&#39;</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="s">&#39;h&#39;</span><span class="p">:</span> <span class="s">&#39;35785831.0&#39;</span><span class="p">,</span> <span class="s">&#39;lon_0&#39;</span><span class="p">:</span> <span class="s">&#39;0&#39;</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="s">&#39;proj&#39;</span><span class="p">:</span> <span class="s">&#39;geos&#39;</span><span class="p">},</span>
<span class="gp">... </span>                               <span class="mi">3712</span><span class="p">,</span> <span class="mi">3712</span><span class="p">,</span>
<span class="gp">... </span>                               <span class="p">[</span><span class="o">-</span><span class="mf">5568742.4</span><span class="p">,</span> <span class="o">-</span><span class="mf">5568742.4</span><span class="p">,</span>
<span class="gp">... </span>                                <span class="mf">5568742.4</span><span class="p">,</span> <span class="mf">5568742.4</span><span class="p">])</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">data</span> <span class="o">=</span> <span class="n">np</span><span class="o">.</span><span class="n">ones</span><span class="p">((</span><span class="mi">3712</span><span class="p">,</span> <span class="mi">3712</span><span class="p">))</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">msg_con_quick</span> <span class="o">=</span> <span class="n">image</span><span class="o">.</span><span class="n">ImageContainerQuick</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="n">msg_area</span><span class="p">,</span> <span class="n">segments</span><span class="o">=</span><span class="mi">4</span><span class="p">)</span>
<span class="gp">&gt;&gt;&gt; </span><span class="n">area_con_quick</span> <span class="o">=</span> <span class="n">msg_con_quick</span><span class="o">.</span><span class="n">resample</span><span class="p">(</span><span class="n">area_def</span><span class="p">)</span>
</pre></div>
</div>
</div>
<div class="section" id="constructor-arguments">
<h3>Constructor arguments<a class="headerlink" href="#constructor-arguments" title="Permalink to this headline"></a></h3>
<p>The full list of constructor arguments:</p>
<blockquote>
<div><strong>ImageContainerQuick</strong>:</div></blockquote>
<ul class="simple">
<li>image_data : Dataset. Masked arrays can be used.</li>
<li>image_data : Geometry definition.</li>
<li>fill_value (optional) : Fill value for undefined pixels. Defaults to 0. If set to <strong>None</strong> they will be masked out.</li>
<li>nprocs (optional) : Number of processor cores to use. Defaults to 1.</li>
<li>segments (optional) : Number of segments to split resampling in. Defaults to auto estimation.</li>
</ul>
<blockquote>
<div><strong>ImageContainerNearest</strong>:</div></blockquote>
<ul class="simple">
<li>image_data : Dataset. Masked arrays can be used.</li>
<li>image_data : Geometry definition.</li>
<li>radius_of_influence : Cut off radius in meters when considering neighbour pixels.</li>
<li>epsilon (optional) : The distance to a found value is guaranteed to be no further than (1 + eps) times the distance to the correct neighbour.</li>
<li>fill_value (optional) : Fill value for undefined pixels. Defaults to 0. If set to <strong>None</strong> they will be masked out.</li>
<li>reduce_data (optional) : Apply geographic reduction of dataset before resampling. Defaults to True</li>
<li>nprocs (optional) : Number of processor cores to use. Defaults to 1.</li>
<li>segments (optional) : Number of segments to split resampling in. Defaults to auto estimation.</li>
</ul>
</div>
<div class="section" id="preprocessing-of-grid-resampling">
<h3>Preprocessing of grid resampling<a class="headerlink" href="#preprocessing-of-grid-resampling" title="Permalink to this headline"></a></h3>
<p>For preprocessing of grid resampling see <a class="reference internal" href="preproc.html#preproc"><em>Preprocessing of grids</em></a></p>
</div>
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<li><a class="reference internal" href="#preprocessing-of-grid-resampling">Preprocessing of grid resampling</a></li>
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