Hello, I am really a newbie in the postgis world.
I am a developper for http://www.openbmap.org/ website which identify GSM cell area from measures of GSM data and GPS coordinates. So I am planning to go from mysql to postgresql/postgis and I am looking for a function that does the following: I have a table containing the gps coordinates mentionned above. I would like to generate a enveloppe or a boundary of the area of the GSM cell. What I have tried (among others) SELECT ST_AsText(ST_Envelope(ST_Collect(gps_coordinates))) FROM "208_1_14592_gps"; with gps_coordinates - POINT geometry It seems to output a 4 points polygons and I would like to get something like http://realtimeblog.free.fr/cell_map.php?mcc=208&mnc=1&lac=14592&cellid=62403&display=Display Is it possible to use postgis functions to generate this kind of envelope ? regards, Nick
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