[gdal-dev] GEOS geometry processing question

Frank Warmerdam warmerdam at pobox.com
Tue Mar 18 16:19:28 EDT 2008


Martin Chapman wrote:
> Frank,
> 
>  
> 
> I notice the gdal code appears to re-order the geometries when geos is in
> use.  What is the purpose of this?  Is it for optimized processing or is it
> critical to the outcome of the geos algorithms?

Martin,

Do you mean that the geometries within something like a MULTIPOINT,
MULTILINESTRING or MULTIPOLYGON get reordered?   This is certainly not
something being specifically done by OGR but may be a side effect of
translating to GEOS format and back.

Best regards,
-- 
---------------------------------------+--------------------------------------
I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
light and sound - activate the windows | http://pobox.com/~warmerdam
and watch the world go round - Rush    | President OSGeo, http://osgeo.org



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