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

[Ethan Alpert]

I'm getting degrees^2 because my geometry is in lat/lon afaict.
 
-e

	-----Original Message-----
	From: postgis-users-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at postgis.refractions.net] On Behalf Of
Craig Miller
	Sent: Tuesday, September 28, 2004 4:07 PM
	To: 'PostGIS Users Discussion'
	Subject: RE: [postgis-users] Computing area in km^2 from 4326
geometries
	
	

	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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