[fdo-users] Creating a spatial filter
simon hope
simonh at geobiz.co.nz
Mon Dec 10 14:46:49 EST 2007
So far I've been using the windows binaries only - I'm assuming the unit
tests are part of the source packages.
Simon
Dan Stoica wrote:
>
> In general when in doubt or looking for snippets, your best bet is the
> unit tests. At least this is my approach :-)
>
> 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: Sunday, December 09, 2007 3:08 PM
> To: fdo-users at lists.osgeo.org
> Subject: RE: [fdo-users] Creating a spatial filter
>
>
> Gavin,
>
> Thanks for the advice that worked - here is the code for completeness:
>
> //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.GetFgf(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());
>
> Cheers
>
> Simon
>
>
> Gavin Cramer wrote:
>>
>> 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
>>> --
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>>>
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>>
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