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    <p>You might be interested in learning about Csquares, which encodes lat,lon into a text string which can be inserted into an indexed column.</p> <p>I have ported the public domain Csquare encoding logic to Java and Javascript.<br> Let me know if you want it.</p> <p><a href="http://www.cmar.csiro.au/csquares/csq-faq.htm#10" rel="nofollow">http://www.cmar.csiro.au/csquares/csq-faq.htm#10</a></p> <p>EXCERPT</p> <ol> <li>What is c-squares, and what purpose does it serve?</li> </ol> <p>C-squares stands for "Concise Spatial Query and Representation System" and is a <strong>method of indexing the geographic location of objects</strong> or observational data on the surface of the earth, in a simple alphanumeric format suitable for subsequent querying by any text-based system or search engine. . . . In addition, c-squares can be defined at a flexible range of scales, from 10 x 10 degrees (approx. 1000 km) through 5 x 5 degrees (500 km), 1 x 1 degrees (100 km), 0.5 x 0.5 degrees (50 km), 0.1 x 0.1 degrees (10 km) and so on, as fine as the user requires.</p> <ol> <li>Who can benefit from using c-squares?</li> </ol> <p>Anyone interested in the <strong>storage, exchange, and retrieval of data</strong> or information with a geographic component, who does not wish to go to the level of sophistication of a fully fledged geographic information system (GIS) merely to be able to search their data holdings by geographic location...</p> <ol> <li>Why not simply store, and quote, latitude and longitude values with a particular data item?</li> </ol> <p>Individual values of latitude and longitude can be, and in most cases would continue to be, stored with particular data items (georeferenced objects). C-squares provides an additional level of functionality over and above these "native" values, in several respects: (i) <strong>the system reduces latitude and longitude (2 dimensional variable) to a single dimensional variable, for easy indexing and subsequent searching</strong> (ii) the system reduces redundancy for multi-point data which occur within a single square (a single code indicating "data present" replaces multiple individual values, for metadata-level information)...</p>
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    1. POHow to draw a rectangular area on a large google map and query database to find locations/points that exist inside the rectangle?
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