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I found admin levels with all subunits for each continent and I combined them using QGIS. Here is the geojson file if you find it useful. https://gist.github.com/cmunns/76fb72646a68202e6bde


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I have to write here, because I have not got reputation for comments. I made vectorization of countours few years ago in ArcMap. There is ArcScan toolbar when I did it. Vectorization, of course, wasn't hundred per cent. You have to then manually edit some lines. In ArcScan toolbar I used Generate Features Inside Area. You can try it if you want. If you ...


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This comes down to the way ST_MakePolygon expects the input geometries. ST_Union is giving you MULITLINESTRINGs, but does not actually combine them. ST_MakePolygon is expecting a complete ring from what I can tell. Use ST_Polygonize instead. This should give you the result you want. WITH contour AS ( SELECT * FROM (VALUES ...


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You can do it in two ways: either by having the elevation data stored within the geometry (as a Z-index), or externally in the attributes table. If stored in the geometry, you can use QGIS' own convertion tool (which uses ogr2ogr? I'm not sure), by selecting your layer and 'Saving As...', then changing the export output from the custom ESRI Shapefile to ...



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