[postgis-users] Computing area in km^2 from 4326 geometries

[Craig Miller]

If the area function is returning square meters (depends on your projection)
then just divide the answer by 4046.896 to get kilometers.

 

All area functions are squared by definition.

 

--Craig

 

 

 

  _____  

From: Ethan Alpert [mailto:ealpert at digitalglobe.com] 
Sent: Tuesday, September 28, 2004 2:57 PM
To: PostGIS Users Discussion
Subject: [postgis-users] Computing area in km^2 from 4326 geometries

 

How does one compute areas in km^2? I was thinking something like
area2d(transform(the_geom,<someEPSG>)). 

How do others do this?

 

Thanks!

 

-e

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