On Tue, Jul 26, 2011 at 10:04 AM, Arnaud Vandecasteele
<[email protected]> wrote:
> Thank you Andrea and Justin for your anwsers.
>
> More precisely my need is simply to check if a point is inside a shape
> of polygones. This polygones are stored in a shapefile.
Ah, there is a variety of ways to deal with this already, no need to make
a new process, you just need to chain existing ones.
If the polygons are few and you can load all of them in memory safely
you can use the jts:intersects process with one argument being the
point, and the other the result of the "collectGeometries" process against
the shapefile.
The attached "containsStates.xml" provides an example, checking if
a point is in any of the topp:states polygons.
If they are many you should probably first call the gs:filter process with
a smal bbox around the point to just get the candidates, and then
call collect and intersect.
The containsShape.xml file, attached, shows a chain that does the
above against a zipped shapefile I have on disk.
> When I will have more time, I will try to use again the WPS extension.
> But I have a last question. If I understand well the documentation, to
> execute a WPS process I have to send to geoserver a XML file. This
> file contains all the elements (input and output) needed by GeoServer.
> But can we use it as well with a simple URL ?
It can, but you'll have to read the WPS specification to build it, the
demo request builder for the moment just builds xml requests.
Chaining 3 processes in a GET request is also going to push you beyond
the maximum length of a GET request quickly.
Cheers
Andrea
--
-------------------------------------------------------
Ing. Andrea Aime
GeoSolutions S.A.S.
Tech lead
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 962313
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-------------------------------------------------------
<?xml version="1.0" encoding="UTF-8"?>
<wps:Execute version="1.0.0" service="WPS" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xmlns="http://www.opengis.net/wps/1.0.0"; xmlns:wfs="http://www.opengis.net/wfs"; xmlns:wps="http://www.opengis.net/wps/1.0.0"; xmlns:ows="http://www.opengis.net/ows/1.1"; xmlns:gml="http://www.opengis.net/gml"; xmlns:ogc="http://www.opengis.net/ogc"; xmlns:wcs="http://www.opengis.net/wcs/1.1.1"; xmlns:xlink="http://www.w3.org/1999/xlink"; xsi:schemaLocation="http://www.opengis.net/wps/1.0.0 http://schemas.opengis.net/wps/1.0.0/wpsAll.xsd";>
<ows:Identifier>JTS:intersects</ows:Identifier>
<wps:DataInputs>
<wps:Input>
<ows:Identifier>a</ows:Identifier>
<wps:Data>
<wps:ComplexData mimeType="application/wkt"><![CDATA[POINT(-100 47)]]></wps:ComplexData>
</wps:Data>
</wps:Input>
<wps:Input>
<ows:Identifier>b</ows:Identifier>
<wps:Reference mimeType="text/xml; subtype=gml/3.1.1" xlink:href="http://geoserver/wps"; method="POST">
<wps:Body>
<wps:Execute version="1.0.0" service="WPS">
<ows:Identifier>gs:CollectGeometries</ows:Identifier>
<wps:DataInputs>
<wps:Input>
<ows:Identifier>features</ows:Identifier>
<wps:Reference mimeType="text/xml; subtype=wfs-collection/1.0" xlink:href="http://geoserver/wfs"; method="POST">
<wps:Body>
<wfs:GetFeature service="WFS" version="1.0.0" outputFormat="GML2">
<wfs:Query typeName="topp:states"/>
</wfs:GetFeature>
</wps:Body>
</wps:Reference>
</wps:Input>
</wps:DataInputs>
<wps:ResponseForm>
<wps:RawDataOutput mimeType="text/xml; subtype=gml/3.1.1">
<ows:Identifier>result</ows:Identifier>
</wps:RawDataOutput>
</wps:ResponseForm>
</wps:Execute>
</wps:Body>
</wps:Reference>
</wps:Input>
</wps:DataInputs>
<wps:ResponseForm>
<wps:RawDataOutput>
<ows:Identifier>result</ows:Identifier>
</wps:RawDataOutput>
</wps:ResponseForm>
</wps:Execute>
<?xml version="1.0" encoding="UTF-8"?>
<wps:Execute version="1.0.0" service="WPS" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"; xmlns="http://www.opengis.net/wps/1.0.0"; xmlns:wfs="http://www.opengis.net/wfs"; xmlns:wps="http://www.opengis.net/wps/1.0.0"; xmlns:ows="http://www.opengis.net/ows/1.1"; xmlns:gml="http://www.opengis.net/gml"; xmlns:ogc="http://www.opengis.net/ogc"; xmlns:wcs="http://www.opengis.net/wcs/1.1.1"; xmlns:xlink="http://www.w3.org/1999/xlink"; xsi:schemaLocation="http://www.opengis.net/wps/1.0.0 http://schemas.opengis.net/wps/1.0.0/wpsAll.xsd";>
<ows:Identifier>JTS:intersects</ows:Identifier>
<wps:DataInputs>
<wps:Input>
<ows:Identifier>a</ows:Identifier>
<wps:Data>
<wps:ComplexData mimeType="application/wkt"><![CDATA[POINT(-100 47)]]></wps:ComplexData>
</wps:Data>
</wps:Input>
<wps:Input>
<ows:Identifier>b</ows:Identifier>
<wps:Reference mimeType="text/xml; subtype=gml/3.1.1" xlink:href="http://geoserver/wps"; method="POST">
<wps:Body>
<wps:Execute version="1.0.0" service="WPS">
<ows:Identifier>gs:CollectGeometries</ows:Identifier>
<wps:DataInputs>
<wps:Input>
<ows:Identifier>features</ows:Identifier>
<wps:Reference mimeType="text/xml; subtype=wfs-collection/1.0" xlink:href="http://geoserver/wps"; method="POST">
<wps:Body>
<wps:Execute version="1.0.0" service="WPS">
<ows:Identifier>gs:Query</ows:Identifier>
<wps:DataInputs>
<wps:Input>
<ows:Identifier>features</ows:Identifier>
<wps:Reference mimeType="application/zip" xlink:href="file:///home/aaime/devel/gisData/world.zip" method="GET"/>
</wps:Input>
<wps:Input>
<ows:Identifier>filter</ows:Identifier>
<wps:Data>
<wps:ComplexData mimeType="text/plain; subtype=cql"><![CDATA[BBOX(the_geom, -101, 46, -99, 48)]]></wps:ComplexData>
</wps:Data>
</wps:Input>
</wps:DataInputs>
<wps:ResponseForm>
<wps:RawDataOutput mimeType="text/xml; subtype=wfs-collection/1.0">
<ows:Identifier>result</ows:Identifier>
</wps:RawDataOutput>
</wps:ResponseForm>
</wps:Execute>
</wps:Body>
</wps:Reference>
</wps:Input>
</wps:DataInputs>
<wps:ResponseForm>
<wps:RawDataOutput mimeType="text/xml; subtype=gml/3.1.1">
<ows:Identifier>result</ows:Identifier>
</wps:RawDataOutput>
</wps:ResponseForm>
</wps:Execute>
</wps:Body>
</wps:Reference>
</wps:Input>
</wps:DataInputs>
<wps:ResponseForm>
<wps:RawDataOutput>
<ows:Identifier>result</ows:Identifier>
</wps:RawDataOutput>
</wps:ResponseForm>
</wps:Execute>
------------------------------------------------------------------------------
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