[fdo-users] Creating a spatial filter

[Gavin Cramer]

Hi, Simon.  Instead of GetWkb, use GetFgf.  FGF is the binary storage format for FDO geometries.

Gavin


-----Original Message-----
From: fdo-users-bounces at lists.osgeo.org [mailto:fdo-users-bounces at lists.osgeo.org] On Behalf Of simon hope
Sent: Tuesday, December 04, 2007 9:44 PM
To: fdo-users at lists.osgeo.org
Subject: RE: [fdo-users] Creating a spatial filter


Hi Dan,

I tried the following:

            //set the geometry fields
            qryPropName = new OSGeo.FDO.Expression.Identifier("shape");

            //create a geometry from a poly
            poly =
(OSGeo.FDO.Geometry.IPolygon)geomFactory.CreateGeometry("POLYGON((176954.045
5914119.79, 1769564.823 5914473.302, 1770089.64 5914474.08, 1770091.198
5914117.454, 176954.045 5914119.79))");
            geom = geomFactory.CreateGeometry(poly);

            //create the byte array required to create the expression
            byteArray = geomFactory.GetWkb(geom);
            OSGeo.FDO.Expression.GeometryValue qryGeomVal = new
OSGeo.FDO.Expression.GeometryValue(byteArray);

            //create the filter
            OSGeo.FDO.Filter.Filter fltr;
            fltr = new OSGeo.FDO.Filter.SpatialCondition(qryPropName,
OSGeo.FDO.Filter.SpatialOperations.SpatialOperations_Intersects,
qryGeomVal);

            //set the filter on the query command
            qrySelect.SetFilter(fltr.ToString());

And I get the same issue - I also tried creating the byteArray directly from
the poly object i.e.

byteArray = geomFactory.GetWkb(poly);

But i get the same message - is it advisable to use this method to create
polygons? i.e from a WKT or is it better to use LinearRings?

Cheers

Simon


Dan Stoica wrote:
>
> Hi,
>
> Use a IPolygon instead of IEnvelope.
>
> Dan.
>
> -----Original Message-----
> From: fdo-users-bounces at lists.osgeo.org
> [mailto:fdo-users-bounces at lists.osgeo.org] On Behalf Of simon hope
> Sent: Tuesday, December 04, 2007 2:08 AM
> To: fdo-users at lists.osgeo.org
> Subject: [fdo-users] Creating a spatial filter
>
>
> Hello,
>
> I'm attempting to create a spatial filter against an SDE FeatureClass. I'm
> hitting a problem with the code below:
>
>             byte[] byteArray;
>             OSGeo.FDO.Geometry.IGeometry geom;
>             OSGeo.FDO.Geometry.IEnvelope env;
>             OSGeo.FDO.Geometry.FgfGeometryFactory geomFactory = new
> OSGeo.FDO.Geometry.FgfGeometryFactory();
>             OSGeo.FDO.Expression.Identifier qryPropName;
>
>             try
>             {
>
>             //set the geometry fields
>             qryPropName = new OSGeo.FDO.Expression.Identifier("shape");
>
>             //create a geometry from an envelope
>             env =
> geomFactory.CreateEnvelopeXY(1765068.119,5916635.233,1765756.4,5917101.847);
>             geom = geomFactory.CreateGeometry(env);
>
>             //create the byte array required to create the expression
>             byteArray = geomFactory.GetWkb(geom);
>             OSGeo.FDO.Expression.GeometryValue qryGeomVal = new
> OSGeo.FDO.Expression.GeometryValue(byteArray);
>
>             //create the filter
>             OSGeo.FDO.Filter.Filter fltr;
>             fltr = new OSGeo.FDO.Filter.SpatialCondition(qryPropName,
> OSGeo.FDO.Filter.SpatialOperations.SpatialOperations_Intersects,
> qryGeomVal);
>
>             //set the filter on the query command
>             qrySelect.SetFilter(fltr.ToString());
>
>             }
>             catch (Exception ex)
>             {
>                 throw new Exception(ex.ToString());
>             }
>             finally
>             {
>                 //todo clean up
>             }
>
> the code falls over when i try and SetFilter - giving me an error:
> {"'FdoFgfGeometryFactory::CreateGeometryFromFgf': Unknown geometry type
> '769' discovered. "}
>
> I've managed to create attribute filters, and have tried to follow that
> pattern for a spatial filter - should I be creating a specific geometry
> type?
>
> Any ideas?
>
> Cheers
>
> Simon
> --
> View this message in context:
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>
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View this message in context: http://www.nabble.com/Creating-a-spatial-filter-tf4941500s18162.html#a14164229
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