[postgis-users] Converting meters to another unit

[Richard Gomes]

Hi All,

I'm a newbie on PostGIS and GIS in general.

Reading section "Taking Advantages of Indexes" at
     http://postgis.refractions.net/docs/ch04.html#id2638955

... I became confused regarding how I could retrieve points which are 
distant up to 500 meters from a given point.
The question is actually how I can transform 500 meters onto some some 
other figure on a unit I don't understand very well what it is about. I 
need this calculation in order to determine a Box3d like the article 
suggests.

Thanks a lot and regards,

-- 

Richard Gomes


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