Splitting

1. Split Polygons by multiple LineStrings
2. Split rectangles along North-South axis
3. Split rotated rectangles into equal parts
4. Split Polygons into equal-area parts
5. Splitting by Line creates narrow gap in Polygonal coverage
6. Splitting Polygon creates invalid coverage with holes
   1. Solution

Split Polygons by multiple LineStrings

https://gis.stackexchange.com/questions/299849/split-polygon-into-separate-polygons-using-a-table-of-individual-lines

Split rectangles along North-South axis

https://gis.stackexchange.com/questions/239801/how-can-i-split-a-polygon-into-two-equal-parts-along-a-n-s-axis

Split rotated rectangles into equal parts

https://gis.stackexchange.com/questions/286184/splitting-polygon-in-equal-parts-based-on-polygon-area

See also next problem

Split Polygons into equal-area parts

http://blog.cleverelephant.ca/2018/06/polygon-splitting.html

Does this really result in equal-area subdivision? The Voronoi-of-centroid step is distance-based, not area based…. So may not always work? Would be good to try this on a bunch of country outines

Splitting by Line creates narrow gap in Polygonal coverage

https://gis.stackexchange.com/questions/378705/postgis-splitting-polygon-with-line-returns-different-size-polygons-that-creat

The cause is that vertex introduced by splitting is not present in adjacent polygon.

• Perhaps differencing splitting line from surrounding intersecting polygon would introduce that vertex?
• Or is it better to snap surrounding polygons to split vertices? Probably need a complex process to do this - not really something that can be done easily in DB?

Splitting Polygon creates invalid coverage with holes

https://gis.stackexchange.com/questions/344716/holes-after-st-split-with-postgis

Solution

None so far. Need some way to create a clean coverage