From rhoskins@home.com Wed Jun  2 08:39:03 1999
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Message-ID: <009b01bead0d$e66c7440$7b790518@olmpi1.wa.home.com>
From: "Richard E. Hoskins" <rhoskins@home.com>
To: <waphgis@u.washington.edu>
References: <004901bead00$e0ed35c0$7b790518@olmpi1.wa.home.com> <37554C85.6055EAE4@tscnet.com>
Subject: Re: Calculating a proximity matrix
Date: Wed, 2 Jun 1999 08:38:02 -0700
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good point ... vector. IDRISI (raster GIS)  does all of this but a raster
coverage won't work for an entire state.

~ R



----- Original Message -----
From: Tom Anderson <tganders@tscnet.com>
To: <waphgis@u.washington.edu>
Sent: Wednesday, June 02, 1999 8:23 AM
Subject: Re: Calculating a proximity matrix


> 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
>
>
>

.