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Date: Wed, 02 Jun 1999 08:23:50 -0700
From: Tom Anderson <tganders@tscnet.com>
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To: waphgis@u.washington.edu
Subject: Re: Calculating a proximity matrix
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Richard,

Is the data in raster or vector format?

Tom

Richard E. Hoskins wrote:

> Does anyone have MapBasic  code for MapInfo, or can any of this be done in
> MI itself  that will calculate a proximity matrix or the components of it
> such as:
>
> Given, say, a 1000 census tracts how can I determine
>
> 1. The IDs of the adjacent census tracts
> 2. The length of the shared boundary of the adjacent census tracts
> 3. The distance between centroids
> 4. Second order adjacent tracts, i.e. tracts that are adjacent to tracts
> that are adjacent to a census tract.
> 5. The distance from a centroid of a census tract and to the nearest point
> on the boundary of adjacent centroids
>
> For all the census tracts
>
> 1. The areas for each one (some data I have, has this for census tracts but
> suppose I had school districts)
> 2. The intercentroid distance
> 3. The distance from a centroid of a census tract and to the nearest point
> on the boundary of adjacent centroids
>
> The purpose is for developing routines to apply a variety of map smoothing
> techniques which need to have information about the neighboring regions,
> census tracts, Zipcodes, etc.
>
> More industrial strength GISs  can do some of this, but its not clear any of
> the desktop packages can.
> I am learning MapBasic now but I am a little lost about how to proceed and a
> jumpstart would be handy. Believe or not I can do some of this in SAS (not
> SAS GIS) but I know I am re-inventing a square wheel. (and I don't have
> access to ArcInfo right now)
>
> Thanks a lot
>
> Richard Hoskins



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