I'm trying to overlay the 1990 block groups onto the 2000 block
groups. These are the geography/data cds that I bought from Caliper.
What happens is the overlay starts to process. and then it stops with
the message "Encountered topological problems when processing
polygons 14708142 and 18188130. Error at or near coordianate (-
119571922,364891287) Click OK to continue. Reference info:
aggr,321,0."
My goal is to calculate some changes in demographics. Like the growth
in hispanic population from 1990 to 2000.
When I zoom to that area (it's in the 1990 layer), I can see that
these polygons overlap each other.
Is there some kind of workaround or fix? I don't need perfection,
just trends.
Bob
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