Forgive my ignorance, I am using a filter such as:
<ogc:DWithin>
<ogc:PropertyName>the_geom</ogc:PropertyName>
<gml:Point><gml:coordinates>-77.46074,37.76504</gml:coordinates></gml:Point>
<ogc:Distance>.001</ogc:Distance>
</ogc:DWithin>
How do I know what units the distance is in? How would I go about specifying a
projection (if I need one)? Is there a default projection that is used? The
data is in a PostGIS database, is the information on the projection available
in the database? Any help would be appreciated.
Thanks, David
_____
From: Andrea Aime [mailto:[EMAIL PROTECTED]
To: David Robison [mailto:[EMAIL PROTECTED]
Cc: geotools-gt2-users@lists.sourceforge.net
Sent: Mon, 05 Nov 2007 15:45:28 -0500
Subject: Re: [Geotools-gt2-users] What are the distance units used by DWithin
David Robison ha scritto:
> I am trying to use DWithin for a filter. However, I don't know what
> distance units it will use by default. Is there a way to tell? The data
> is in EPSG:4326
DWithin works with euclidean distance, so you won't be able to
use it in EPSG:4326. You can use it only in projected CRS where
a flat world assumption can work.
Cheers
Andrea
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