+7I'm trying to replace part of a raster DEM so I cut a hole in it and created a few points in a shapefile to define new heights in the hole - I want to interpolate across the hole to these new heights keeping everything else the same.
I'm using RasterDEMGenerator but the hole is filled with elevation=0 except for tiny spikes where my control points are
+61How do you have the RasterDEMGenerator set up? And how does the spacing of the new points relate to the DEM spacing?
+7How do you have the RasterDEMGenerator set up? And how does the spacing of the new points relate to the DEM spacing?
I'm working in degrees so:
I have 3 control points and I'm trying to use them to interpolate across a hole, which is maybe around 500 cells cut from the original dem - as shown in the pic below.
+61Thinking out loud here, how about generating a TIN first of the original DEM and the control points and then create a new DEM from that?
+7How do you have the RasterDEMGenerator set up? And how does the spacing of the new points relate to the DEM spacing?
OK. The problem is when I cut the hole - it's creating values at zero, not nulls. So I just need to filter these out before channelling everything into RasterDEMGenerator.
+10OK. The problem is when I cut the hole - it's creating values at zero, not nulls. So I just need to filter these out before channelling everything into RasterDEMGenerator.
Hi,
If your initial DEM is already a Raster, you might have to set a nodata value on this initial DEM (the one with the hole) to prevent values from the "hole" to be considered as "real" values.
