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copied!<p>These are 2 different ways, you may try:</p> <ul> <li><p>You can use <a href="http://code.google.com/apis/maps/documentation/geocoding/#ReverseGeocoding">Google Maps Reverse Geocoding</a> . In result set you can determine whether it is water by checking <code>types</code>. In waters case the type is <code>natural_feature</code>. See more at this link <a href="http://code.google.com/apis/maps/documentation/geocoding/#Types">http://code.google.com/apis/maps/documentation/geocoding/#Types</a>.</p> <p>Also you need to check the names of features, if they contain <code>Sea, Lake, Ocean</code> and some other words related to waters for more accuracy. For example the deserts also are <code>natural_feature</code>s.</p> <p><strong>Prons</strong> - All detection process will be done on client's machine.No need of creating own server side service.</p> <p><strong>Cons</strong> - Very inaccurate and the chances you will get "none" at waters is very high.</p></li> <li><p>You can detect waters/lands by pixels, by using <a href="http://code.google.com/apis/maps/documentation/staticmaps/index.html">Google Static Maps</a>. But for this purpose you need to create http service. </p> <p>These are steps your service must perform:</p> <ol> <li>Receive <code>latitude</code>,<code>longitude</code> and <code>current zoom</code> from client.</li> <li>Send <code>http://maps.googleapis.com/maps/api/staticmap?center={</code>latitude<code>,</code>longitude<code>}&zoom={</code>current zoom`}&size=1x1&maptype=roadmap&sensor=false request to Google Static Map service.</li> <li>Detect pixel's color of 1x1 static image.</li> <li>Respond an information about detection.</li> </ol> <p>You can't detect pixel's color in client side. Yes , you can load static image on client's machine and draw image on <code>canvas</code> element. But you can't use <code>getImageData</code> of canvas's context for getting pixel's color. This is restricted by cross domain policy. </p> <p><strong>Prons</strong> - Highly accurate detection</p> <p><strong>Cons</strong> - Use of own server resources for detection</p></li> </ul>

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