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Hi,
Regarding: http://trac.osgeo.org/fdo/wiki/FDORfc38
- Multi-polygon support for SHP.
In our last discussions on this RFC, there was concern
about performance impact.
Dan has done some prototype performance testing to determine
the impact of this proposed change. He used some datasets that included complex
multi-polygons including Norway data and Australia data that had detailed multi-polygons
for all the islands (100’s of loops for each feature). Following are some
statistics with before and after timings. With each of these datasets, the time
to render on the screen was much longer than these load times and there is no
difference that an end user would see in these cases.
Australia: 9 multipolygon features with 3 of them having
between 800 and 900 polygon loops each, others averaging about 100 loops each.
.015 seconds to .125
seconds
Europe: 54 multipolygon features with Norway having 862
loops, with others of 653, 509, 359 loops, and the rest averaging about 100
loops each.
.016 seconds to .17
seconds
Queensland parcels: 2,000,000 polygons
Unchanged at 1.6 seconds
So, yes it takes longer to process, but the overall
timings are still sub-second for the complex cases. There is also no impact on
cases of regular polygons.
Dan will be back from his vacation soon and will be able to
do the implementation. So, I’d like to get to a vote on this if nobody
has objections.
Thanks,
Orest.
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