[mapserver-users] Buffers (fwd)

[Stephen Lime]

It's an interesting question, one that has a number of possible answers depending on
what exactly you want to do. MapServer has no formal buffering support. That is, there
is no way to take a feature, buffer it and create a new feature. However, if you think
about it many queries are themselves buffers. For example, a point query (nquery mode)
with a tolerance other than 0 effectively creates a search buffer (i.e. find all features within
x units of this point). Same goes for polygon features when using the featurequery modes.
MapServer also supports searches based on arbitrary polygons passed in via a url or
using MapScript. It's the users responsibility to get those features using java or whatever.

Display of the selected (eg. buffered) features then is handled using querymaps.

Steve

Stephen Lime
Internet Applications Analyst

Minnesota DNR
500 Lafayette Road
St. Paul, MN 55155
651-297-2937

>>> teb <teb at mallit.fr.umn.edu> 05/09/01 09:23AM >>>

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From: "PSU" <tqm101 at psu.edu>
To: <mapserver-info at lists.gis.umn.edu>
Subject: Buffers
Date: Wed, 9 May 2001 09:34:36 -0400
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Is there any information available reguarding buffering? At a 
minimum, I would like to display data liked to objects within a 
buffer area that users will define.

Thanks,
Tom

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