Hi again! We are now experimenting with the spatial query performance
of Mitab on Windows CE. In our setup, we have a dataset of 3022
objects, and we are simply setting a spatial filter and measuring the
time it takes to loop through the filtered dataset using
IMapInfoFile::GetNextFeature(). The release build of the test program
is executed on a Qtek 2020i. Our data has been generated by MapInfo,
but we get the same results when using data generated by tab2tab -o.
When setting a rectangle covering 709 objects, it takes 11 seconds to
loop through them. When using a rectangle covering 66 objects, it
takes 8 seconds. Unfortunately, this is insufficient for our
purposes. Does anyone else have experience of spatial query
performance issues, particularly on Windows CE? Any ideas of what we
could try to get better results? What should be the computational
time complexity with regard to the number of objects in the rectangle
and the total number of objects?
Regards,
Jerker
Tetrasoft
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