Maptitude - http://research.umbc.edu/~roswell/maptitude.html
It seems to be that the easiest way to perform this task is to do the
following:
1. join your sales data to the cczip5pt.cdf file.
2. Join the cczip5.cdf (zip boundaries) to the joined view created in step
one using the field "enclosing zip." This creates a 1 to many join which
automatically aggregates any numerical data fields (i.e. "sales").
3. Shade the Zip Code Boundaries by Sales.
The primary advantages of this, in my opinion are as follows:
1. is that it doesn't require you to build or modify any of the base zip
code geographies (merge by value creates new layers).
2. the map themes will still be based on zip code boundaries, which may be
important (areas of influence create different boundaries altogether).
3. the joined views and themes can be saved in the map and automatically
updated as new sales data becomes available. This requires that the sales
file is always of the same table structure and file name (e.g. field names,
types, etc). Simply overwrite the previous sales file with a new one and,
when you open the map, the new data is read and shaded appropriately.
Let me know if you'd like more information on this approach...
Good Luck!
Michael Kesselman
Vice President, Engineering
Geonomics, Inc.
[EMAIL PROTECTED]
----- Original Message -----
From: "Steve-Hendel" <[EMAIL PROTECTED]>
To: "'Maptitude List'" <[EMAIL PROTECTED]>
Sent: Monday, February 05, 2001 11:22 AM
Subject: [Maptitude] Wish - Mapping Data for Enclosing Zips
> Maptitude - http://research.umbc.edu/~roswell/maptitude.html
>
> Hello to everyone. I have been a fan of Maptitude for a long time,
> since it is cheap. powerful, and relatively easy to use. We are not yet
> using it for any production applications here at Office Depot, but I and
> some others occasionally use it for desktop work. Other departments are
> using MapInfo and formerly Atlas GIS as they have connections with other
> vendors whose products we use.
>
> We often create ZIP code area maps denoting things like sales,
> market potential and market penetration. Maptitude provides some great
data
> on USPS 5-digit ZIP code areas and ZIP code centroids. But you can't
create
> an area map for point data, which is what the ZIP centroids are. My wish
is
> that there be a way, inside of Maptitude, to include data for enclosed
point
> ZIP codes in their enclosing ZIP areas.
>
> For example, in Charlotte NC, the area ZIP 28208 encloses thirteen
> point ZIPSs (28219, 28228, 28240, 28254, 28258, 28260, 28265, 28266,
28272,
> 28275, 28289, 28290, and 28296). We have sales data for each of these 14
> ZIP codes, as that is provided by the customer address. Yet we have area
> data and demographic information only for the area ZIP 28208. Is there a
> way, without external processing, that we can specify to have point ZIP
data
> mapped into the area ZIP in which the point ZIPs are enclosed? If not,
> please add it to the wish list.
>
> Thanks. This is a most interesting, active, and helpful list. I am
> happy to finally be able to contribute, if only a question. Maybe in the
> future, I can help provide some answers too.
>
> Steve Hendel
> Director - Systems Development
> Office Depot
> 2200 Old Germantown Rd
> Delray Beach FL 33445-8299
> 561-438-1321
>
>
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