OK. I am using this filter as part of a geoserver wfs call. Is there a way to tell the query to reproject the coordinates into something that has a better unit, such as meters? Thanks, David Robison
Andrea Aime wrote: > David Robison ha scritto: >> 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. > > Unit can be expressed but will be completely disregarded, dwithin > will be translated into a postgis query verbatim using the > ST_DWithin function > (http://postgis.refractions.net/docs/ch06.html#id2630911) > which again is unit agnostic. > > Long story short, there is no way to have coordinates expressed > in one unit and have the filter use another. Everything works fine > if and only if the distance is expressed in the same units as > the coordinates (which does not make much sense when you're playing > with geographic coordinates). > > Cheers > Andrea -- David R Robison Open Roads Consulting, Inc. 708 S. Battlefield Blvd., Chesapeake, VA 23322 phone: (757) 546-3401 e-mail: [EMAIL PROTECTED] web: http://openroadsconsulting.com blog: http://therobe.blogspot.com book: http://www.xulonpress.com/book_detail.php?id=2579 ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Geotools-gt2-users mailing list Geotools-gt2-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
