[postgis-users] Is the Earth round??

[Gregory S. Williamson]

Having recently crossed paths with this for certain vector data, I am wondering if there are any guides that might indicate pros/cons of such projections ? Or is this a topic of some undergraduate class ?

Thanks for any illumination on this geomancy...

Greg Williamson
DBA (more dba than GIS specialist, that's for sure)
GlobeXplorer LLC


-----Original Message-----
From:	postgis-users-bounces at postgis.refractions.net on behalf of strk at refractions.net
Sent:	Tue 5/23/2006 1:56 AM
To:	postgis-users at postgis.refractions.net
Cc:	
Subject:	Re: [postgis-users] Is the Earth round??

On Tue, May 23, 2006 at 10:41:00AM +0200, Carlos Ferrão wrote:
> Hello,
> How does postGIS handle polygons that cross the International Date Line?
> 
> I defined a polygon with POLYGON((177 72, -179 72, 174 66, 173 65, 171
> 65, 171 66, 177 72))
> The polygon is considered invalid because 180 is not connected to -180.
> 
> Is the earth round in postGIS??

Nope, our earth is flat.
I suggest you use a different projection to work with 
data crossing the date line.

--strk;

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