greg at tekknow.net greg at tekknow.net
Thu Feb 22 20:12:38 PST 2024
Hi Greg,
while I'm not sure that the IDW interpolation is the right interpolation
algorithm to use in order to obtain a valid DEM from irregularly sampled
elevation data and that Google Earth is a valid source of elevation data
at sufficient resolution and precision for a house building, it looks
like the main issue is due to the fact that the point vector layer
containing the elevation data is in a geographical Coordinate Reference
System, i.e. the unit of measure of the X and Y coordinates is the
degree, while the unit of measure of the Z coordinate (elevation) is
probably the metre.
Thus, in order for the the 3D terrain to be correctly displayed, you
firstly need to reproject the point vector layer containing the
elevation data to a projected Coordinate Reference System whose unit of
measure for the X and Y coordinates is the metre and then use such
reprojected point vector layer to create the DEM.
I suggest you to use an UTM projection suitable for your area.
Best regards.
Andrea
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