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	<title>Echo.2 &#187; google map</title>
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		<title>Extract Google Map Satellite Image Tiles</title>
		<link>http://blogs.infoecho.net/echo/2007/02/03/extract-google-map-satellite-image-tiles/</link>
		<comments>http://blogs.infoecho.net/echo/2007/02/03/extract-google-map-satellite-image-tiles/#comments</comments>
		<pubDate>Sat, 03 Feb 2007 23:50:08 +0000</pubDate>
		<dc:creator>Jason Chin</dc:creator>
				<category><![CDATA[hacking]]></category>
		<category><![CDATA[programming]]></category>
		<category><![CDATA[google map]]></category>
		<category><![CDATA[map]]></category>

		<guid isPermaLink="false">http://blogs.infoecho.net/echo/?p=89</guid>
		<description><![CDATA[Click the tiles to zoom in for one level. Clike the &#8220;back&#8221; button to go back. back Show URL for the 2nd quarter Show URL for the 1st quarter Show URL for the 3rd quarter Show URL for the 4th quarter The URL to extract Google&#8217;s satellite image tiles has a very simple encoding. It [...]]]></description>
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Click the tiles to zoom in for one level.<br />
Clike the &#8220;back&#8221; button to go back.<br />
<button onclick="back()";>back</button></p>
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<p>The URL to extract Google&#8217;s satellite image tiles has a very simple encoding. It is simply <tt>"http://kh0.google.com/kh?&#038;v=14?t=t"</tt> where the argument followed by <tt>t=</tt> is a string composed with letters &#8220;q&#8221;,&#8221;r&#8221;,&#8221;t&#8221; and &#8220;s&#8221;. These letters indicate the quarter of the image tile from the last image.  For example, the first quarter (north-east) of the root image uses &#8220;t=tr&#8221;. The second quarter uses &#8220;t=tq&#8221;, the third quarter uses &#8220;t=tt&#8221; and the forth quarter uses &#8220;t=ts&#8221;. To get the next zoom level, you can just append either &#8220;r&#8221;,&#8221;q&#8221;,&#8221;t&#8221; and &#8220;s&#8221; in the argument. The longer the string, the higher the zoom level. As an example, the URL for the tile that shows Mt. Rainer is &#8220;<a href="http://kh0.google.com/kh?&#038;v=14&#038;t=tqtrtsqtrqrs"><tt>http://kh0.google.com/kh?&#038;v=14&#038;t=tqtrtsqtrqrs/</tt><tt></tt></a>.&#8221;  It would be straight forward to write a program to get the tiles you need by specifying longitude and latitude. This would be handy to composed satellite image for a region you like and print it out.</p>
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