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