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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: GISList: Distances between points |
| Date: |
06/10/2002 07:58:38 AM |
| From: |
Peter H. Van Demark |
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T.:
>I have a data set of approximately 25,000 records in a point file. I have a
>set of 25 control points.
>I would like to generate the distance from each of the points in the larger
>set to it's closest control point, with the end result being a table of
>these values, and their appropriate labels (ie: which of the points is being
>measured,which of the control points is it closest to, and what is the
>distance).
>
>Is there an easy, (or mostly painless) way to do this?
If you use Maptitude it is quite easy to tag map features in one layer with
field values, or the distance, to the closest map feature in another layer.
You would have the 25,000 points in one point layer, with fields ready to
receive the control point ID and the distance to that control point. You
would have the control points in another map layer.
Then you would open the dataview for the first layer, right-click on the
control point ID column heading, choose Fill and, using the Tag option, tag
the points with the appropriate field from the control point layer. You
would then right click on the control point distance column, choose Fill
and, again using the Tag option, tag the points with the distance,
automatically computed from the control point layer.
For more information on Maptitude, please visit
(http://www.caliper.com/maptovu.htm).
Peter
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Peter Van Demark
Director of GIS Products and Training Phone: 617-527-4700
Caliper Corporation Fax: 617-527-5113
1172 Beacon Street E-mail: peter@caliper.com
Newton MA 02461-9926 Web site: http://www.caliper.com
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