[postgis-users] Polygon area in meters

[Kemal Bayram]

Hello Ibo,
 
Unfortunately Mercator is not an equal area projection. In the end I found a
nice Mollweide projection  (although there are plenty of others that would
have worked) that did what I needed:
 
INSERT into spatial_ref_sys (srid, auth_name, auth_srid, proj4text, srtext)
values ( 954009, 'esri', 54009, '+proj=moll +lon_0=0 +x_0=0 +y_0=0
+ellps=WGS84 +datum=WGS84 +units=m +no_defs ',
'PROJCS["World_Mollweide",GEOGCS["GCS_WGS_1984",DATUM["WGS_1984",SPHEROID["W
GS_1984",6378137,298.257223563]],PRIMEM["Greenwich",0],UNIT["Degree",0.01745
3292519943295]],PROJECTION["Mollweide"],PARAMETER["False_Easting",0],PARAMET
ER["False_Northing",0],PARAMETER["Central_Meridian",0],UNIT["Meter",1],AUTHO
RITY["EPSG","54009"]]')
 
Regards

Kemal

 
  _____  

From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of ibrahim
saricicek
Sent: 09 February 2010 16:38
To: PostGIS Users Discussion
Subject: Re: [postgis-users] Polygon area in meters


Hi;

don't know if official spatial reference or not but you may use this one;
http://trac.openlayers.org/wiki/SphericalMercator

Regards.. IBO.. 

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