Jason Roberts wrote:
Dear geospatial software experts,
By integrating with GEOS, OGR can perform various spatial operations on
individual geometries, such as buffer, intersection, union, and so on.
Is there a library that efficiently performs these kinds of operations
on entire OGRLayers? For example, this library would have functions that
would buffer all of the features in a layer, or intersect all of the
features in one layer with all of those in another. Basically, I am
looking for an open source technology that replicates the "geoprocessing
tools" found in ArcGIS and other GIS packages. These tools traditionally
operate on one or more layers as input and produce one or more layers as
output.
Jason,
I'd like to see something along this line happen. I to do it efficiently
it would be necessary to dig into GEOS past the C interface so that
a spatial index on a collection of features can be maintained over time
rather than created and discarded for each pairwise test of two geometries.
I am somewhat hesitant to have this sort of processing go into GDAL/OGR
itself, especially as an extensive set of methods on OGRLayer. I think
it could be done as a layered processing library without any noticable
loss of performance.
Best regards,
--
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I set the clouds in motion - turn up | Frank Warmerdam, [email protected]
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush | Geospatial Programmer for Rent
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