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<div class="section" id="map-projections">
<h1>Map projections<a class="headerlink" href="#map-projections" title="Permalink to this headline">¶</a></h1>
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<p>Google Maps use Mercator projection for browser-based maps.  When
Fusion creates a map that uses <strong>maps.google.com</strong> imagery as the
source, it uses Google Maps projection for the rasterized vectors
so that they match the underlying Google Map tiles.  This EPSG code
is <strong>EPSG:900913</strong> or <strong>EPSG:3785</strong>.</p>
<p>However, GEE builds 3D data using the
<a class="reference external" href="http://en.wikipedia.org/wiki/World_Geodetic_System">WGS84</a>
datum (<strong>EPSG:4326</strong>).  If you want to reuse 3D database
resources, you can create a flat map using the Fusion Flat (Plate
Carrée) projection.</p>
<p>If you build a Mercator-based database, you must build resources
specifically for use with Mercator-based projection.</p>
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