[geos-devel] GetIntersection

Paul Meems bontepaarden at gmail.com
Sat Sep 18 04:25:59 EDT 2010

Hi list,

We use the GDAL library with GEOS in our ActiveX control: MapWinGIS.ocx.
This ocx is used by MapWindow GIS as the mapping part.

We recently implemented the GetIntersection method from GEOS in our ocx and
I'm running some tests.
When I call the GetIntersection method on several small shapefiles it takes
16 minutes to process 9 shapefiles.
In our ocx we convert from shapefile to the GEOS geometry.

But when I call it with two large shapefiles it is processing a long time
(>5 hours) and then it crashes.
We haven't find out if our ocx is crashing or GEOS, but for now I want to
know if we can set some additional params to improve the performance.

I run the test on a 4core 8GB RAM WinVista and it is only using 650MB of RAM
and only 23-26% of my processor.
I want to let it use more of my resources so it will perform faster. After
that we can look deeper in the crash.



Paul Meems
Release manager, configuration manager
and forum moderator of MapWindow GIS.

Owner of MapWindow.nl - Support for
Dutch speaking users.
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