Maptitude - http://research.umbc.edu/~roswell/maptitude.html
I encourage some more discussion on the merge by value feature. I have never
understood it - now I have a glimmer. This sounds like a very powerful
feature.
Richard Hoskins
[EMAIL PROTECTED] <mailto:[EMAIL PROTECTED]>
GMT -8
-----Original Message-----
From: Peter H. Van Demark [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, April 11, 2001 8:45 AM
To: Maptitude
Subject: Re: [Maptitude] Thematic Mapping Question
Maptitude - http://research.umbc.edu/~roswell/maptitude.html
All:
I want to add to the previous answers another one that uses the Merge by
Value command, which is under-documented (my fault). It is a great way to
combine records that have a common value.
Using Kjartan's formula field to merge records with the same lat/lon, and
another formula field (Count is a good name) with 1 as its formula, you can
merge on the first formula field, add the second formula field, and
copy/add/whatever other fields to get your summary table. Then use Locate
by Coordinate to turn the table into a point layer, and use the Count field
for your theme(s).
Peter
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Peter Van Demark
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Caliper Corporation Fax: 617-527-5113
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