[GIS] GetFeature request with polygon intersecting polygons

geoservergetfeatureintersectionopenlayers-2wfs

My task is very straightforward: a user draws a polygon and queries all parcel polygons. The query string extends the URL limit. So I am posting XML to WFS. However, GeoServer always returned 0 feature, but I knew the query polygon overlapped several tax parcels. If I passed a single point, it worked fine. Did I miss anything for sending a polygon? I used the OpenLayers buildGeometry to create the polygon GML. I can't figure out what's wrong.

Please Help.

Here is my code: 

var gml = new OpenLayers.Format.GML(); 
var polygonGML = gml.buildGeometry.polygon.apply(gml,[taArray[0].geometry])
console.log(polygonGML); 
var plgGMLString = (new XMLSerializer()).serializeToString(polygonGML);

var geo_req_url = proxyHost + "http://localhost:8080/geoserver/wfs"; 
var query_xml = '<?xml version=' 
    + '<wfs:GetFeature service="WFS" version="1.1.0" xmlns:wfs="http://www.opengis.net/wfs" xmlns="http://www.opengis.net/ogc" xmlns:gml="http://www.opengis.net/gml" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.opengis.net/wfs http://schemas.opengis.net/wfs/1.1.0/wfs.xsd">' 
    + '<wfs:Query typeName="topp:tax_parcel"><Filter><Intersects><PropertyName>geom</PropertyName>'
    + plgGMLString 
    + '</Intersects></Filter></wfs:Query></wfs:GetFeature>'; 

$.post(
    geo_req_url,
    query_xml,
    function(data) {
        geoResults = data.features;
        remove_selected_features(); 
        draw_sel_features(); 
    },
    "application/json"
);

Here is the printout of plgGMLString.

<gml:Polygon>
<gml:outerBoundaryIs>
<gml:LinearRing>
<gml:coordinates decimal="." cs="," ts=" ">-74.00567761405651,40.546826958183715 ...</gml:coordinates>
</gml:LinearRing>
</gml:outerBoundaryIs>
</gml:Polygon>

Best Answer

So is the polygon in north america? Mind that WFS 1.1 assumes by default a lat/lon axis order, so you might have to flip coordinates. See also this: http://docs.geoserver.org/latest/en/user/services/wfs/basics.html#axis-ordering

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