Thanks for the link to the book Brent (Fraser). I'll check it out and add a link to it on my blog.
You raised an interesting concept that I didn't think of before: "Another interesting problem (and potential more difficult) is tracing the lineage of an object (historical-style relationships such as "was-created-from" and "became", etc)." Perhaps an example of this that applies to my data model would be a Coordinate feature that results from or was created from a Control Tie. But things could get complicated fairly quickly. A Coordinate in this context is actually the result of a Control Tie and a Network Adjustment. Brent (Pedersen) also mentioned a concept that I hadn't thought of. He wrapped my Monument events in a "history" object. I hadn't thought of linking events in this way. You guys have given me some great stuff to chew on. I know there will be some challenges, but I definitely plan on incorporating temporal data into my data model and I will incorporate both your suggestion and Brent Pedersen's into my work. Thanks very much for taking the time to discuss this. Landon -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Brent Fraser Sent: Thursday, December 13, 2007 3:09 PM To: [email protected] Subject: Re: [Geowanking] Time In GIS Landon, You could have a look at Gail Langran's book: Langran, Gail (1992): Time in Geographic Information Systems As Brent Pederson points out, it can be as simple as a table join once you've decided which objects you are going to model and which events are important to those objects. Another interesting problem (and potential more difficult) is tracing the lineage of an object (historical-style relationships such as "was-created-from" and "became", etc). Brent Fraser GeoAnalytic Inc. Calgary, Alberta ----- Original Message ----- From: "Landon Blake" <[EMAIL PROTECTED]> To: <[email protected]>; "OSGeo Discussions" <[EMAIL PROTECTED]> Sent: Thursday, December 13, 2007 1:48 PM Subject: [Geowanking] Time In GIS This is being sent to the geowanking and OSGEO discuss list. I apologize in advance if you catch it in your inbox twice, but I didn't want to miss any potential resources. I'm working on a GIS Data Model in which I am trying to model some temporal data. I've done a little research online, but most of the info is pretty ESRI specific. Although I'm somewhat curious about the use of temporal data in a GIS in general, I'm really interested in a specific approach to the problem. Does anyone know if there is material available that discusses using events to model temporal data? (Like the "events" we use in GUI programming.) I'd really like to read some "software-neutral" principles on how events can be used to model time in GIS if this is available. Or, if you have tackled this challenge personally, I'd love to learn more about your personal experience and solutions. Thanks, Landon (A.K.A. - The Sunburned Surveyor) P.S. - I posted about the particular circumstances that led to my interest in this topic and some existing material I found online at my OpenJUMP blog: http://openjump.blogspot.com/ Warning: Information provided via electronic media is not guaranteed against defects including translation and transmission errors. If the reader is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this information in error, please notify the sender immediately. ------------------------------------------------------------ -------------------- > _______________________________________________ > Geowanking mailing list > [email protected] > http://lists.burri.to/mailman/listinfo/geowanking > _______________________________________________ Geowanking mailing list [email protected] http://lists.burri.to/mailman/listinfo/geowanking _______________________________________________ Geowanking mailing list [email protected] http://lists.burri.to/mailman/listinfo/geowanking
