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<div class="section" id="setting-up-the-map">
<span id="mapsetup"></span><h1>Setting up the map<a class="headerlink" href="#setting-up-the-map" title="Permalink to this headline">¶</a></h1>
<p>In order to represent the curved surface of the earth on a two-dimensional
map, a map projection is needed. Since this cannot be done without
distortion, there are many map projections, each with it’s own advantages
and disadvantages. Basemap provides 24 different map projections.
Some are global, some can only represent a portion of the globe. When
a <a class="reference internal" href="../api/basemap_api.html#mpl_toolkits.basemap.Basemap" title="mpl_toolkits.basemap.Basemap"><code class="xref py py-class docutils literal"><span class="pre">Basemap</span></code></a> class instance is
created, the desired map projection must
be specified, along with information about the portion of the earth’s
surface that the map projection will describe. There are two basic
ways of doing this. One is to provide the latitude and longitude values
of each of the four corners of the rectangular map projection region.
The other is to provide the lat/lon value of the center of the map
projection region along with the width and height of the region in
map projection coordinates.</p>
<p>The class variable <code class="docutils literal"><span class="pre">supported_projections</span></code> is a dictionary containing
information about all the projections supported by Basemap. The keys
are the short names (used with the <code class="docutils literal"><span class="pre">projection</span></code> keyword to define
a projection when creating a <code class="docutils literal"><span class="pre">Basemap</span></code> class instance), and the values
are longer, more descriptive names. The class variable <code class="docutils literal"><span class="pre">projection_params</span></code>
is a dictionary that provides a list of parameters that can be used to
define the properties of each projection. Following are examples that
illustrate how to set up each of the supported projections. Note that
many map projection possess one of two desirable properties - they can be
equal-area (the area of features is preserved) or conformal (the shape of
features is preserved). Since no map projection can have both at the same
time, many compromise between the two.</p>
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<li class="toctree-l1"><a class="reference internal" href="aeqd.html">Azimuthal Equidistant Projection</a></li>
<li class="toctree-l1"><a class="reference internal" href="gnomon.html">Gnomonic Projection</a></li>
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<li class="toctree-l1"><a class="reference internal" href="gall.html">Gall Stereographic Projection</a></li>
<li class="toctree-l1"><a class="reference internal" href="cea.html">Cylindrial Equal-Area Projection</a></li>
<li class="toctree-l1"><a class="reference internal" href="lcc.html">Lambert Conformal Projection</a></li>
<li class="toctree-l1"><a class="reference internal" href="laea.html">Lambert Azimuthal Equal Area Projection</a></li>
<li class="toctree-l1"><a class="reference internal" href="stere.html">Stereographic Projection</a></li>
<li class="toctree-l1"><a class="reference internal" href="eqdc.html">Equidistant Conic Projection</a></li>
<li class="toctree-l1"><a class="reference internal" href="aea.html">Albers Equal Area Projection</a></li>
<li class="toctree-l1"><a class="reference internal" href="pstere.html">Polar Stereographic Projection</a></li>
<li class="toctree-l1"><a class="reference internal" href="plaea.html">Polar Lambert Azimuthal Projection</a></li>
<li class="toctree-l1"><a class="reference internal" href="paeqd.html">Polar Azimuthal Equidistant Projection</a></li>
<li class="toctree-l1"><a class="reference internal" href="vandg.html">van der Grinten Projection</a></li>
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