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<p>If using the <code>widget</code> renderer, debug output will be displayed in JavaScript console. With the <code>jsdom</code> renderer, it will be displayed directly in the notebook.</p>
<p>The <a href="https://observablehq.com/@observablehq/plot-geo?collection=@observablehq/plot">Geo mark</a> allows to draw geographic features such as points, lines and polygons. These marks data are passed as GeoJSON.</p>
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<p>This allows to create choropleth maps such as the following:</p>
<p>Of course other marks can be used in conjunction with geo marks. This example represents the density of Walmarts supermarkets and is taken from the <a href="https://observablehq.com/@observablehq/plot-mapping?collection=@observablehq/plot">Mapping notebook</a>.</p>
<div class="code-copy-outer-scaffold"><div class="sourceCode cell-code" id="cb2"><pre class="sourceCode python code-with-copy"><code class="sourceCode python"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="co"># Load US states from TopoJson with geopandas and convert to GeoJson</span></span>
<p>The <a href="https://observablehq.com/@observablehq/plot-raster?collection=@observablehq/plot">Raster mark</a> creates an image from spatial data.</p>
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<p>Plot allows to do different type of spatial interpolations, such as <em>nearest</em>, which draws voronoi cells around values:</p>
<p>The following chart, taken from the <a href="https://observablehq.com/@observablehq/plot-cell?collection=@observablehq/plot">Cell Mark notebook</a>, shows the rating of every episode of <em>The Simpsons</em>.</p>
<p><em>Faceting</em> allows to easily produce multiple plots by partitioning data. The following facet plot is taken from the <a href="https://observablehq.com/@observablehq/plot-facets?collection=@observablehq/plot">Facets notebook</a>.</p>
<p>Some marks allow for nice representation of complex data. The following plot, taken from the <a href="https://observablehq.com/@observablehq/plot-arrow?collection=@observablehq/plot">Arrow mark notebook</a>, shows the evolution of inequality and population in various U.S. cities.</p>
<p>The contour mark allows for nice representations of spatial data. The following example taken from the <a href="https://observablehq.com/@observablehq/plot-contour?collection=@observablehq/plot">Contour mark notebook</a> shows water vapor data from november 2022 (note that data processing and plot code are slightly modified to adapt to <code>pyobsplot</code> specificities).</p>
<p><ahref="https://observablehq.com/@observablehq/plot-group?collection=@observablehq/plot">Group transform</a> allows to compute summary values before plotting them. It is often used to make bar charts.</p>
<p>The <ahref="https://observablehq.com/@observablehq/plot-dodge?collection=@observablehq/plot">Dodge transform</a> allows to pack marks without overlapping. The following chart shows data about IPO offerings in the US.</p>
<p>The <ahref="https://observablehq.com/@observablehq/plot-hexbin?collection=@observablehq/plot">Hexbin transform</a> aggregates two dimensional points into hexagonal bins.</p>
<p><ahref="https://observablehq.com/@observablehq/plot-map?collection=@observablehq/plot">Map transform</a> family can be used to normalize values.</p>
<p>Several group and map transforms can be applied and composed to create complex representations, such as this distribution of group ages by US states adapted from the <ahref="https://observablehq.com/@observablehq/plot-map?collection=@observablehq/plot">Map transform</a> notebook.</p>
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