Timeline for How to rectify polygon shapes in QGIS?
Current License: CC BY-SA 3.0
20 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| May 4, 2020 at 16:50 | answer | added | J.R | timeline score: 0 | |
| May 4, 2020 at 16:23 | answer | added | LAT | timeline score: 3 | |
| Jan 18, 2018 at 15:53 | vote | accept | q9f | ||
| Jan 18, 2018 at 10:07 | answer | added | Stefan | timeline score: 4 | |
| May 26, 2013 at 17:22 | history | edited | underdark | CC BY-SA 3.0 |
deleted 7 characters in body; edited title
|
| May 26, 2013 at 15:14 | history | reopened |
q9f PolyGeo♦ Ian Turton |
||
| May 26, 2013 at 9:37 | review | Reopen votes | |||
| May 26, 2013 at 15:14 | |||||
| May 26, 2013 at 9:22 | comment | added | q9f | When did that question get closed? This question is about post-processing of existing polygons, not about creating simple rectangels. | |
| May 6, 2013 at 7:32 | history | closed | underdark | exact duplicate | |
| Apr 6, 2013 at 3:08 | answer | added | Jorge Santos | timeline score: 2 | |
| Jan 28, 2013 at 19:03 | history | tweeted | twitter.com/#!/StackGIS/status/295970350410395648 | ||
| Dec 31, 2012 at 14:26 | comment | added | whuber | @Under I cannot find it either. A closely related one (where I wrote a comment, not an answer) is Finding Polygons Without Right Angles. In my search I also uncovered How to Create Polygons with Straight Lines and Right Angles in QGIS as well as a duplicate (which I have just closed and merged). | |
| Dec 31, 2012 at 0:10 | comment | added | underdark | @whuber Wasn't there a similar question a few months ago? I cannot seem to find it. I think you answered it back then. | |
| Dec 29, 2012 at 9:50 | history | edited | underdark | CC BY-SA 3.0 |
edited body
|
| Dec 28, 2012 at 16:23 | comment | added | whuber | @Nathan It's nowhere as easy as that in general, because each time you change a vertex location you create distortions elsewhere. Even when fixing near-rectangles (as opposed to more complicated polygons) you can wind up producing new features that are clearly not very good approximations to the original ones. One problem is that there is not a unique way to calculate a new point at a bad vertex. See forums.esri.com/Thread.asp?c=93&f=987&t=303128#948330 for a discussion and pseudocode. I tested that approach (using Excel, of all things!) and found that it tends to work well. | |
| Dec 28, 2012 at 14:02 | comment | added | urcm | read this answer for orthogonal digitizing. | |
| Dec 28, 2012 at 13:17 | comment | added | Nathan W | In theory it should be pretty easy to write something to do this. Loop each point in the odd shape, checking the angle to the next point from the current one if it's not 90 then calculate the new point and adjust the point. Now someone just needs to write the code :) | |
| Dec 28, 2012 at 12:08 | review | Close votes | |||
| Dec 28, 2012 at 15:16 | |||||
| Dec 28, 2012 at 11:54 | comment | added | Nathan W | Ignore my close flag. It is a different question. | |
| Dec 28, 2012 at 11:29 | history | asked | q9f | CC BY-SA 3.0 |