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3D is not (yet) implemented in QGIS, but you can store the height in an attribute table field and create a 3D output manually with ogr2ogr -z_field fieldname outside QGIS. See Is it possible to create 3D dxf with OGR? for an example. This is rather 2.5D, because all vertices of a line must have the same elevation (as contours have). In QGIS, you could use ...


There's a couple of ways of going about this. In both cases ensure you have set up snapping. Cut your hole (Egypt) as per the tutorial and you will get your original polygon with a hole where you want the new feature to be but note how, in creating the ring, it leaves the original outside edge alone (you need to digitize along the edge in this case ...

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