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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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BradHards is right. If you let us know the environment you are working in the stackexchange community can narrow down the answers specific to your tools. For now I will answer the high level question of what 1.4m resolution means. Forgive me if I provide basic info you already know, but I am unaware of your level of understanding and don't want to skip ...



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