Maptitude - http://research.umbc.edu/~roswell/maptitude.html
Hi Ken,
> I'm working with a state-wide data file of block group data involving
> approx. 3,400 BGs. I have tagged all the BGs with another geographic
> code and am attempting to aggregate BG data for the new tagged geography
> (e.g. 26 regional watershed polygons). Whether I choose a user-defined
> aggregation method or accept the default aggregation type, I get the
> same result....a fatal "floating point error" which crashes the system.
The problem may not be a divide-by-zero. I'm assuming you're using
the Merge-by-Value command to perform the aggregation? If so, the
problem could be with the Block Group geography you're using, or
potentially with the successfulness of the Tag operation you did.
If there are any serious quirks in your boundaries, the aggregation
might choke on them as it attempts the merge. What's the source
of the BG data? Did you edit the boundaries at all? Regarding the
Tagging operation, did all the BGs get tagged? Try doing a color
theme on the Tagged watershed field -- see any holes?
-Philip Villars
Philip Villars (617) 527-4700 / 5113 FAX
Manager of Technical Support Services
Caliper Corporation
1172 Beacon St.
Newton MA 02461
www: www.caliper.com
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