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Basic sp-gist indexing?

Please forgive a very, very elementary question. I am using a PostgreSQL 9.3.5 database, and one of the tables stores longitude and latitude. (These are two separate columns.) I would like to do ...
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Factors in computing scoring for place name searches, like Geonames

As part of the FULL response style, the GeoNames search API returns results like the following: <geonames style="FULL"> <totalResultsCount>510</totalResultsCount> ...
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Trajectory Indexing: How could I store and index the large trajectory dataset generated by cars' GPS?

I have a large trajectory dataset generated by cars' GPS. Since I will do some data mining work on them, I need an efficient way to store and index them. I read some papers about Trajectory Indexing ...