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<div class="section" id="gnomonic-projection">
<span id="gnomon"></span><h1>Gnomonic Projection<a class="headerlink" href="#gnomonic-projection" title="Permalink to this headline">ΒΆ</a></h1>
<p>In the gnomonic projection, great circles are straight lines.</p>
<div class="highlight-python"><div class="highlight"><pre><span class="kn">from</span> <span class="nn">mpl_toolkits.basemap</span> <span class="kn">import</span> <span class="n">Basemap</span>
<span class="kn">import</span> <span class="nn">numpy</span> <span class="kn">as</span> <span class="nn">np</span>
<span class="kn">import</span> <span class="nn">matplotlib.pyplot</span> <span class="kn">as</span> <span class="nn">plt</span>
<span class="n">m</span> <span class="o">=</span> <span class="n">Basemap</span><span class="p">(</span><span class="n">width</span><span class="o">=</span><span class="mf">15.e6</span><span class="p">,</span><span class="n">height</span><span class="o">=</span><span class="mf">15.e6</span><span class="p">,</span>\
<span class="n">projection</span><span class="o">=</span><span class="s">'gnom'</span><span class="p">,</span><span class="n">lat_0</span><span class="o">=</span><span class="mf">60.</span><span class="p">,</span><span class="n">lon_0</span><span class="o">=-</span><span class="mf">30.</span><span class="p">)</span>
<span class="n">m</span><span class="o">.</span><span class="n">drawmapboundary</span><span class="p">(</span><span class="n">fill_color</span><span class="o">=</span><span class="s">'aqua'</span><span class="p">)</span>
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<span class="n">m</span><span class="o">.</span><span class="n">drawparallels</span><span class="p">(</span><span class="n">np</span><span class="o">.</span><span class="n">arange</span><span class="p">(</span><span class="mi">10</span><span class="p">,</span><span class="mi">90</span><span class="p">,</span><span class="mi">20</span><span class="p">))</span>
<span class="n">m</span><span class="o">.</span><span class="n">drawmeridians</span><span class="p">(</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">180</span><span class="p">,</span><span class="mi">180</span><span class="p">,</span><span class="mi">30</span><span class="p">))</span>
<span class="n">plt</span><span class="o">.</span><span class="n">title</span><span class="p">(</span><span class="s">'Gnomonic Projection'</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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<p>(<a class="reference external" href="../users/figures/gnomon.py">Source code</a>)</p>
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