On Fri, 2010-02-19 at 08:19 -0800, d8930 wrote: > Hi, > I am working on this as well. However, for testing I am using a point that > lies in the German city of Wiesbaden-Naurod. This city has the > geocoordinates 8.301388 / 50.13472. When I transform it by > SELECT astext(ST_Transform(ST_SetSRID(ST_MakePoint(8.301388,50.13472), > 4326), 900913)) > I get the value POINT(924106.285037392 6469639.74359406), which pretty much > is the same as the value in my PostGIS-DB (that was fed from OSM): > 646985238;92409686 (considering multiplication by 100). > However, the other way round, with > SELECT > astext(ST_Transform(ST_SetSRID(ST_MakePoint(92409686/100,646985238/100), > 900913), 4326))") > I get the strange result POINT(1.30152356525693e-06 7.86059348425535e-06) > instead of somethin with 8.3* and 50.1*. > Any idea, why this could be?
It works for me, though there was an extra ") in what you quoted. gis=> select astext(ST_Transform(ST_SetSRID(ST_MakePoint(92409686/100,646985238/100),900913), 4326)); astext ----------------------------------------- POINT(8.30129560793713 50.135942170124) (1 row) You will get slightly better accuracy if you divide by 100.0 to force the result to be calculated as a float: gis=> select astext(ST_Transform(ST_SetSRID(ST_MakePoint(92409686/100.0,646985238/100.0),900913), 4326)); astext ----------------------------------------- POINT(8.30130333344857 50.135944358132) (1 row) Jon _______________________________________________ talk mailing list talk@openstreetmap.org http://lists.openstreetmap.org/listinfo/talk