Hi, No mercator projection can encompass the poles, as they are asymptotic & the latitude values approach infinity.
"Because the Mercator projects the poles at infinity, Google Maps cannot show the poles. Instead it cuts off coverage at 85° north and south." Brent Wood --- On Fri, 3/16/12, Puneet Kishor <punk.k...@gmail.com> wrote: From: Puneet Kishor <punk.k...@gmail.com> Subject: [postgis-users] creating a grid; transform error To: "PostGIS Users Discussion" <postgis-users@postgis.refractions.net> Date: Friday, March 16, 2012, 3:47 PM I am trying to create a simple 1 deg x 1 deg grid and transform it to spherical mercator SELECT ST_Transform(ST_MakeEnvelope(minx, miny, maxx, maxy, 4326), 900913) the_geom FROM ( SELECT lng minx, lat miny, (lng + 1) maxx, (lat + 1) maxy FROM ( SELECT Generate_series(-180, 180, 1) lng, Generate_series(-90, 90, 1) lat ) series WHERE (lng + 1) < 181 AND (lat + 1) < 91 ) lat_lng I get ERROR: transform: couldn't project point (-180 -90 0): tolerance condition error (-20) What am I doing wrong? -- Puneet Kishor _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
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