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| GeoCommunity Mailing List |
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| Subject: | Re: [gislist] Directional Relationship |
| Date: |
06/28/2005 08:00:01 AM |
| From: |
Anthony Quartararo |
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Perhaps I am missing something, but isn't this a "simple" topological
problem ? If you have features (points, lines and polygons) that you want to
be able to relate, compare and query against, then, you should have a
"global" topological structure that would allow the system to compute what
"points of interest" are "north" of "street A". I am not sure this is
entirely and completely possible in a vector-based GIS, particularly between
the different feature types (points vs. lines vs. polygons). In it's
simplest form, the topological structure of say, a mapquest.com "driving
direction" tool tells you where to turn, and how to get from A to B, and if
there are any hotels or restaurants along the way, etc. This would not
strictly be "topological" but it would combine that with overlay analysis
and proximity analysis, but there is this "intelligence" built in to the
datasets you are querying against. Not sure this is helpful, but I am
confident the topic is well past the "research" phase and there are a lot of
really smart, authoritative people on this list that can help you.
Anthony
-----Original Message-----
From: gislist-bounces@lists.geocomm.com
[mailto:gislist-bounces@lists.geocomm.com] On Behalf Of Nathan Lai
Sent: Tuesday, June 28, 2005 12:25 AM
To: gislist@lists.geocomm.com
Subject: [gislist] Directional Relationship
Hi All,
I was told that directional relationship between spatial objects was still
largely a research topic. Is that true? Actually, I would like my
application to be able to answer question like "What are the sightseeing
spots located at the north of street A?", "What are the restaurants opposite
to the building B?" Is that difficult to achieve this goal?
Thanks!
Nathan
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