I've spent over 12 years putting together properties and buildings map layers for the municipality I live in, and I have about 6 main/major revisions to these map layers, wherein each took me a few concentrated months to accomplish(apart from the gradual and subtle, but continued daily/weekly/monthly/annually work I've put into them). When I compare each to the other, I find it interesting how properties have been sub-divided, buildings built, marinas carved into the earth, and so on. 6 months ago, I finally setup my system so that so it is receiving construction permits in realtime, and construction permit completions in realtime, so now I am able to record data with accuracy down to the week, or day, and the same thing with property division and title transfers.
So when comparing these major revisions of my map layers with one another, I've often wished I could animate them, and create a movie that shows a month of change occurring in 10 seconds for example, or whatever... and extruding the building foot prints(3D) using the permit start/finish dates, and a bunch of other fun visual/timeline stuff. But alas, I've not had the tools to do this, hence, this is why I wished OSM had them(the tools) :-) But yes, I do understand your points as it relates to general contributions... but it would still be fun none the less, right? Eric On Sep 24, 2010, at 4:09 AM, Serge Wroclawski wrote: > When an object is saved in OSM, the changeset ID is saved with it, and > the changeset includes its own metadata in the form of both > automatically entered attributes (the user, the date), and also its > own set of tags. > > The problem with specifying a date in the form you mentioned are a few: > > 1) All data is already implied to be as of the date entered into the DB. > 2) Data that's not individually surveyed (ie is from an import) should > already store some metadata about its collection > 3) This doesn't solve the timeline proble, > > 1 and 2 seem self-explanatory (and if that's not the case, let me know > and I'll elaborate). > > The problem is 3: > > You may say (as you do) that a park is empty at some point and then a > playground is entered. But for this to be useful, we'd have to assume > that you've surveyed the entire park and have entered everything in > the park. > > You might think you've entered everything, but then I'll come around > and enter in the water fountains, portable toilets and waste bins. > > So does that mean these objects didn't exist when you were there and > were added later? > > Then we're back where we are now, not knowing if this is a new > feature, or simply one that's not been entered into the system. > > - Serge > > _______________________________________________ > newbies mailing list > [email protected] > http://lists.openstreetmap.org/listinfo/newbies > Eric Jarvies [email protected] CONFIDENTIALITY NOTICE: The information contained in this e-mail is privileged, confidential, proprietary and is intended only for the use of the individual or entity named above. Any contained or attached works in/of this email bearing a Copyright notice should not be duplicated or transmitted to any other party without the express written consent of Eric Jarvies, or unless indicated in any such terms or conditions as may be referenced in said works respective license(s). If you are not the intended recipient, and have received this email in error, or from someone without permission to redistribute, you are notified that any disclosure, copying, distribution, electronic storage or use of this communication is prohibited. If you received this communication in error, please notify me immediately by e-mail, attaching the original message, and subsequently deleting the original message from your computer and any network to which your computer is connected. Thank you, and sorry for any inconvenience this may have caused. _______________________________________________ newbies mailing list [email protected] http://lists.openstreetmap.org/listinfo/newbies
