[geos-devel] GEOSDiffernce vs GEOSIntersection complexity?

G. Allegri giohappy at gmail.com
Sat Jul 5 01:29:09 PDT 2014

As I supposed the problem was on QGIS side. A lot of empty
geometrycollections were returned, which made QGIS write tons of logging.

Sorry for the buzz,
Il 04/lug/2014 17:08 "G. Allegri" <giohappy at gmail.com> ha scritto:

> I'm trying to understand why the two tools in QGIS using the respective
> functions have so much differnce in execution times.
> I've made the two tools as similar as possible, to have the GEOS calls as
> the only difference. The execution time differs of a copule of magnitude of
> orders. I wonder if the two overlay operations, on the GEOS side, are so
> differnt to justify such a difference on the execution time. At first sight
> they appeared to be similar from the point of view of the geometrical
> operations involved in the computation, aren't they?
> Giovanni
> --
> Giovanni Allegri
> http://about.me/giovanniallegri
> Twitter: https://twitter.com/_giohappy_
> blog: http://blog.spaziogis.it
> GEO+ geomatica in Italia http://bit.ly/GEOplus
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