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| GeoCommunity Mailing List |
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| Subject: | Re: [gislist] Directional Relationship |
| Date: |
06/28/2005 08:15:02 AM |
| From: |
Mohamed Eleiche |
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Dear Nathan,
Thanks for your posting, and your confidence in this professional list,
This is the right place to ask such a question.
Let me declare something to you:
To achieve what you need (perform spatial/topological/tabular query)
can be done easily, in condition that you have the tools and capabilities to
do so :
You need GIS tool (which is not the major need),
and the most important thing that you have your geospatial
model and data capable of performing such query.
You can imagine your need as a target, and the geospatial data is the
highway,
and your car is the GIS tool, perhaps the driver also is vital.
Kind Regards
Mohamed Eleiche
GIS Consultant
----- Original Message -----
From: "Anthony Quartararo" <ajq3@spatialnetworks.com>
To: "'Nathan Lai'" <nathanwh@macau.ctm.net>: <gislist@lists.geocomm.com>
Sent: Tuesday, June 28, 2005 3:57 PM
Subject: Re: [gislist] Directional Relationship
> 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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