Maptitude - http://research.umbc.edu/~roswell/maptitude.html The BG boundaries are the ones supplied in the AGS block group data sets sold by Caliper Corp. so I have assumed that the topology is complete. I'll try your theme map idea and let you know the result. Kevin Byrnes Philip Villars wrote: > 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 > !.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.!.! > > ______________________________________________________________________ > To unsubscribe, write to [EMAIL PROTECTED] ______________________________________________________________________ To unsubscribe, write to [EMAIL PROTECTED]
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