Timeline for Polygon creation (Clockwise rotation or not) [duplicate]
Current License: CC BY-SA 3.0
14 events
| when toggle format | what | by | license | comment | |
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| Aug 31, 2016 at 4:04 | history | closed | PolyGeo♦ | Duplicate of Order of polygon vertices in general GIS: clockwise or counterclockwise [closed] | |
| Aug 31, 2016 at 4:04 | history | edited | PolyGeo♦ | CC BY-SA 3.0 |
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| Aug 31, 2016 at 3:57 | review | Close votes | |||
| Aug 31, 2016 at 4:04 | |||||
| Aug 31, 2016 at 3:37 | comment | added | jbalk | This has already been answered here: gis.stackexchange.com/questions/119150/… | |
| Aug 29, 2016 at 1:03 | comment | added | mdsumner | The point of simple features was to remove the ambiguity about what was a hole and was is not. Any Polygon is just one island, anything that comes next is a hole in that island. That's why you need multipolygons, one island per Polygon in a MultiPolygon. In this context the winding doesn't matter, though I think the spec is the reverse of that for shapefiles. It's interesting there's no answers here, maybe no one's really 100% sure - like me :) | |
| Aug 27, 2016 at 8:35 | comment | added | mdsumner | Read this? gis.stackexchange.com/questions/119150/… | |
| Aug 15, 2016 at 4:06 | history | tweeted | twitter.com/StackGIS/status/765036922137894912 | ||
| Jan 23, 2013 at 20:29 | history | edited | Kirk Kuykendall |
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| Jan 23, 2013 at 20:20 | comment | added | Kirk Kuykendall | A bit of theory: I suspect the use of the surveyor's formula for area calculation was what drove people to adopt the clockwise convention. Clockwise coordinates produce positive areas using this formula, whereas counterclockwise coordinates produce negative areas. | |
| Jan 23, 2013 at 20:16 | comment | added | Kirk Kuykendall | No, outer rings must be created clockwise. | |
| Jan 23, 2013 at 12:53 | comment | added | Jermain Marthin | Appreciate your reply. Outter lings must be created counterclockwise. Understood! | |
| Jan 22, 2013 at 21:43 | comment | added | Kirk Kuykendall | Arcmap 10.1 crashes a lot when labeling a featureclass that contains polygons whose outter rings are counterclockwise. | |
| Jan 22, 2013 at 21:04 | answer | added | user681 | timeline score: 2 | |
| Jan 22, 2013 at 16:39 | history | asked | Jermain Marthin | CC BY-SA 3.0 |