[OpenLayers-Users] Problem using Spatial Filter
Diego Marin Santos
diegomrsantos at gmail.com
Fri Oct 16 15:41:29 EDT 2009
I'm using a WFS layer and I wanna filter some features using a spatial
filter. My filter is of type: DWITHIN
Here is the code:
*var point = new OpenLayers.Geometry.Point(-122.8764, 42.3263)
point.transform(new OpenLayers.Projection("EPSG:4326"), new
OpenLayers.Projection("EPSG:2270"));
var wfslayer = new OpenLayers.Layer.Vector("WFS", {
strategies: [new OpenLayers.Strategy.BBOX()],
protocol: new OpenLayers.Protocol.WFS({
url: "http://localhost:8080/geoserver/wfs",
featureType: "schools",
featureNS: "http://www.medford.org/",
srsName: "EPSG:900913",
version: "1.1.0"
}),
filter: new OpenLayers.Filter.Spatial({
type: OpenLayers.Filter.Spatial.DWITHIN,
property: "the_geom",
value: point,
distance : 4250
})
});*
I have a doubt about what I should use in the value property of the Filter,
does the variable point have to be in the same projection of the data? I
think so. Is correct the way i did it? My feature type schools is in
EPSG:2270 projection.
But the main problem is that it returns a number of features that is
different of the number of features the postgis returns when I run this
query (that is equivalent to code above):
SELECT Count(*) as value
FROM schools
WHERE
ST_DWithin(
the_geom,
ST_Transform(ST_GeomFromText('POINT(-122.8764 42.3263)',
4326),2270),
4250
);
What do you think is my mistake?
Thanks
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