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| GeoCommunity Mailing List |
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| Subject: | Re: [gislist] Directional Relationship |
| Date: |
06/29/2005 12:25:01 AM |
| From: |
George |
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Hello Mohamed:
Assalamo a'laikom, from Riyadh.
In your email you ended off with "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." I would say that the word "perhaps" is an unfortunate choice. In GIS, the "driver" is the most important part of the whole thing. The driver sets the target (Project), asseses the target needs, gets the data to reach the target, and uses the GIS tool to complete the whole process. Therefore, in my opinion, the "driver" is not a "perhaps" but the key to the whole endeavour - be it small or large.
Just my 2 halals worth!
George.
"Where ever you go, there you are."
GIS Consultant. UK , North America, the Middle East, and the EU.
--- On Tue 06/28, Mohamed Eleiche < mohamed_eleiche@hotmail.com > wrote:
From: Mohamed Eleiche [mailto: mohamed_eleiche@hotmail.com]
To: ajq3@spatialnetworks.com, nathanwh@macau.ctm.net, gislist@lists.geocomm.com
Date: Tue, 28 Jun 2005 16:17:19 +0300
Subject: Re: [gislist] Directional Relationship
Dear Nathan,<br><br>Thanks for your posting, and your confidence in this professional list,<br>This is the right place to ask such a question.<br><br>Let me declare something to you:<br>To achieve what you need (perform spatial/topological/tabular query)<br>can be done easily, in condition that you have the tools and capabilities to<br>do so :<br>You need GIS tool (which is not the major need),<br>and the most important thing that you have your geospatial<br>model and data capable of performing such query.<br><br>You can imagine your need as a target, and the geospatial data is the<br>highway,<br>and your car is the GIS tool, perhaps the driver also is vital.<br><br>Kind Regards<br><br>Mohamed Eleiche<br>GIS Consultant<br><br><br>----- Original Message -----<br>From: "Anthony Quartararo" <ajq3@spatialnetworks.com><br>To: "'Nathan Lai'" <nathanwh@macau.ctm.net>: <gislist@lists.geocomm.com><br>Sent: Tuesday, June 28, 2005 3:57 PM<br>Subject: Re: [gislist] Directional
Relationship<br><br><br>> Perhaps I am missing something, but isn't this a "simple" topological<br>> problem ? If you have features (points, lines and polygons) that you want<br>to<br>> be able to relate, compare and query against, then, you should have a<br>> "global" topological structure that would allow the system to compute what<br>> "points of interest" are "north" of "street A". I am not sure this is<br>> entirely and completely possible in a vector-based GIS, particularly<br>between<br>> the different feature types (points vs. lines vs. polygons). In it's<br>> simplest form, the topological structure of say, a mapquest.com "driving<br>> direction" tool tells you where to turn, and how to get from A to B, and<br>if<br>> there are any hotels or restaurants along the way, etc. This would not<br>> strictly be "topological" but it would combine that with overlay analysis<br>> and proximity analysis, but there is this "intelligence" built in to the<br>> datasets you are
querying against. Not sure this is helpful, but I am<br>> confident the topic is well past the "research" phase and there are a lot<br>of<br>> really smart, authoritative people on this list that can help you.<br>><br>> Anthony<br>><br>> -----Original Message-----<br>> From: gislist-bounces@lists.geocomm.com<br>> [mailto:gislist-bounces@lists.geocomm.com] On Behalf Of Nathan Lai<br>> Sent: Tuesday, June 28, 2005 12:25 AM<br>> To: gislist@lists.geocomm.com<br>> Subject: [gislist] Directional Relationship<br>><br>> Hi All,<br>><br>> I was told that directional relationship between spatial objects was still<br>> largely a research topic. Is that true? Actually, I would like my<br>> application to be able to answer question like "What are the sightseeing<br>> spots located at the north of street A?", "What are the restaurants<br>opposite<br>> to the building B?" Is that difficult to achieve this goal?<br>><br>> Thanks!<br>><br>> Nathan<br>><br>>
_______________________________________________<br>> gislist mailing list<br>> gislist@lists.geocomm.com<br>> http://lists.geocomm.com/mailman/listinfo/gisl
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