[postgis-users] Calculate area shperoid

[Brent Wood]

--- luzbrigitte <luzbrigitte at hotmail.com> wrote:

> Hi, anyone knows how can I calculate area to polygons ?  We work with WGS84
> system,  srid -1 and PostGis 0.9

If your SRID is -1, then Postgis doesn't know whether the units are
degrees/metres etc. If your data is lat/long degrees wgs84, try using a SRID
like 4326 instead. That allows the transform function to correctly reproject
your lat/long coords to the equal area projection you want to derive your area
result from.


Brent