Timeline for How to Generate Points on Corner of Polygon Only
Current License: CC BY-SA 3.0
18 events
| when toggle format | what | by | license | comment | |
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| Nov 17, 2015 at 22:21 | answer | added | phloem | timeline score: 0 | |
| Feb 3, 2015 at 0:11 | comment | added | FelixIP | Assuming polygons are rectangular in shape Minimum bounding geometry will do the job. Features to points and delete identical can be applied later. | |
| Feb 2, 2015 at 23:21 | answer | added | ianbroad | timeline score: 0 | |
| Feb 2, 2015 at 23:17 | comment | added | Chris W | Also, if you do go the Simplify or Generalize route to clean up the original grid (assuming you can do that without damaging it and those vertices are in fact extra), be careful what method you use. Some of them can actually move the point you're trying to preserve - say two corners don't quite meet, it might snap them together somewhere between. Obviously this would be an error in the original survey grid, but you'd compound it by 'arbitrarily' moving the corner points. | |
| Feb 2, 2015 at 23:12 | answer | added | Chris W | timeline score: 1 | |
| Feb 2, 2015 at 22:43 | comment | added | Vince | I'd recommend aggressive generalization, but not on the original table (leave it alone). You can use the spaghetti & meatballs technique to link the generalized shapes back to the original | |
| Feb 2, 2015 at 22:39 | comment | added | Jennifer | Basically, I'm trying to compare survey grids (Version 2.6 to Version 4.1) to determine where in the area the grid has shifted and by how much. | |
| Feb 2, 2015 at 22:32 | comment | added | Chris W | I would caution against removing those vertices unless you know you can. They may be there for a reason - for example, the bottom left cell's west line doesn't appear to be straight. Is the grid topologically correct (meaning all cells share common vertices, with no overlap or gap)? One method you might try is Feature to Line first, and then Feature to Vertices on those with a point location restriction to ends. Not sure if going to lines will work though - the overlap may create a line from each segment rather than each side. Whichever way you'd need to clean duplicates from the result. | |
| Feb 2, 2015 at 22:29 | history | edited | PolyGeo♦ | CC BY-SA 3.0 |
deleted 25 characters in body; edited tags
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| Feb 2, 2015 at 22:26 | comment | added | Jennifer | Geographic Coordinate System: GCS_North_American_1983 Datum: D_North_American_1983 Prime Meridian: Greenwich Angular Unit: Degree | |
| Feb 2, 2015 at 22:23 | comment | added | Michael Stimson | Use a bendsimplify tolerance of fairly large. I don't know what spatial reference you are in or how far between your vertices so I can't suggest a tolerance; try double the value then evaluate the results, if still unsuccessful then double again. | |
| Feb 2, 2015 at 22:20 | comment | added | Jennifer | That produced far less points, but still not only on the corners. | |
| Feb 2, 2015 at 22:15 | comment | added | Michael Stimson | Generalize help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//… or simplify help.arcgis.com/en/arcgisdesktop/10.0/help/index.html#//… the polygons to remove the vertices on the straight sections and then repeat feature vertices to points. | |
| Feb 2, 2015 at 22:13 | comment | added | Jennifer | I'm using ArcGIS 10.1 | |
| Feb 2, 2015 at 22:07 | comment | added | Ryan Garnett | What GIS application are you using? In QGIS you could look at using Vector - Simplify Geometries. ArcGIS will have a similar tool. It will remove vertices from a shapefile from within a tolerance, which is based on a distance. | |
| Feb 2, 2015 at 21:57 | comment | added | Jennifer | I agree, thanks Ryan. I did not create the original polygons, they come off our main server. Is there a tool I could use to clean up all non essential ones? | |
| Feb 2, 2015 at 21:56 | comment | added | Ryan Garnett | Why do you have so many vertices for rectangles? If you were to remove all the non essential vertices (ie: the ones between corners) you would be able to get what you want. Having all those vertices is not a good thing to have in your polygons. | |
| Feb 2, 2015 at 21:51 | history | asked | Jennifer | CC BY-SA 3.0 |