Timeline for Difference between projection and datum
Current License: CC BY-SA 4.0
38 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Jun 14, 2022 at 7:03 | history | edited | Taras♦ | CC BY-SA 4.0 |
added 1 character in body; edited title
|
| Nov 27, 2018 at 23:05 | history | edited | PolyGeo♦ | CC BY-SA 4.0 |
edited title
|
| Jul 24, 2018 at 2:49 | history | tweeted | twitter.com/StackGIS/status/1021588148772585477 | ||
| S Jan 10, 2018 at 13:26 | history | notice removed | Ian Turton | ||
| S Jan 10, 2018 at 13:26 | history | unlocked | Ian Turton | ||
| Jan 10, 2018 at 13:26 | history | wiki removed | Ian Turton | ||
| Jan 10, 2018 at 13:25 | history | protected | Ian Turton | ||
| S May 27, 2016 at 5:46 | history | notice added | PolyGeo♦ | Wiki Answer | |
| S May 27, 2016 at 5:46 | history | locked | PolyGeo♦ | ||
| Feb 19, 2015 at 20:40 | history | edited | PolyGeo♦ |
edited tags
|
|
| Aug 6, 2014 at 16:43 | answer | added | dotMorten | timeline score: 20 | |
| Aug 6, 2014 at 16:01 | comment | added | dotMorten | I wrote an in-depth article on this on my blog here: sharpgis.net/post/2007/05/05/… It covers all these concepts in a hopefully easy to understand manner. | |
| Oct 9, 2013 at 0:37 | answer | added | derelict | timeline score: 15 | |
| Jul 20, 2013 at 23:39 | comment | added | Devdatta Tengshe | I have rolled back the revision of the title, since a datum doesn't always mean a Geographic Coordinate system, nor does a projection always mean projected coordinate system. | |
| Jul 20, 2013 at 23:37 | history | rollback | Devdatta Tengshe |
Rollback to Revision 3
|
|
| Jul 20, 2013 at 14:16 | history | edited | Tomas | CC BY-SA 3.0 |
edited title
|
| Jul 13, 2013 at 8:57 | answer | added | Reza | timeline score: 13 | |
| May 22, 2013 at 6:11 | answer | added | Qaiser Imtiaz - TOGAF | timeline score: 18 | |
| May 15, 2013 at 6:57 | answer | added | DLG | timeline score: 8 | |
| Jan 28, 2012 at 15:42 | comment | added | MappaGnosis | There won't be a single answer for this as "datum" in GIS can be one of at least three different things e.g. geodetic datum (a reference from which measurements are made), a single reference point (often sea level as in "Ordnance Survey datum" = mean sea level at Newlyn in Cornwall, UK) and a reference ellipsoid (which is probably how most GIS people use the term. Finally here's a fourth meaning for the sake of pedantic completeness - datum = singular of data (so any single piece of information is a datum) :) | |
| Mar 22, 2011 at 1:01 | comment | added | BenjaminGolder | Great question for beginners! Here is another great explanation of the differences between datums, projections, coordinate systems, etc. with some illustrations (This is linked to in the PostGIS documentation): sharpgis.net/post/2007/05/… | |
| Aug 19, 2010 at 20:10 | answer | added | whuber | timeline score: 118 | |
| Aug 17, 2010 at 15:28 | history | edited | Adam Matan |
edited tags; edited tags
|
|
| Aug 10, 2010 at 22:26 | answer | added | WolfOdrade | timeline score: 13 | |
| Aug 10, 2010 at 15:02 | comment | added | mkadunc | I think someone should mention the distinction between the two possible interpretations of "Map Projection" - namely "Projected CRS", which includes the datum and is what wwnick seems to be describing (gis.stackexchange.com/questions/664/…) and "Projection Method", which is what is described in dev's answer (gis.stackexchange.com/questions/664/…). | |
| Aug 8, 2010 at 9:45 | history | edited | scw |
edited tags
|
|
| Aug 4, 2010 at 19:52 | answer | added | mkadunc | timeline score: 49 | |
| Aug 4, 2010 at 8:40 | vote | accept | fmark | ||
| Aug 4, 2010 at 8:39 | history | made wiki | Post Made Community Wiki by fmark | ||
| Aug 4, 2010 at 8:38 | comment | added | fmark | Good idea, wikifying now - should help us develop a good, canonical answer :) | |
| Aug 4, 2010 at 8:24 | comment | added | JasonBirch | I wonder if this would be best as a community wiki, where we could collectively roll all of the answers up into a single, combined best answer. I'm personally not especially fond of broad questions where the answers are easily found on wikipedia, etc. | |
| Aug 4, 2010 at 7:39 | answer | added | wwnick | timeline score: 209 | |
| Aug 3, 2010 at 17:44 | comment | added | matt wilkie | the answer using text from the Manifold docs is rated higher because one doesn't have to click through to get the meat. Personally I don't find the projection page that illuminating, the datum one one the other hand I like, especially for the graphic: help.arcgis.com/en/arcgisdesktop/10.0/help/003r/… | |
| Aug 3, 2010 at 12:04 | answer | added | BlocK | timeline score: 27 | |
| Aug 3, 2010 at 6:24 | comment | added | Adam Matan | This is going to be one of the highly viewed questions on this stackexchange. | |
| Aug 3, 2010 at 3:50 | comment | added | Kirk Kuykendall | ESRI's docs have discussions on Projected Coordinate Systems and Datums. | |
| Aug 3, 2010 at 3:15 | answer | added | Devdatta Tengshe | timeline score: 122 | |
| Aug 3, 2010 at 2:25 | history | asked | fmark | CC BY-SA 2.5 |
