Hello,
I have a question to Blue Kenue developpers.
I would like to know how is the interpolation performed when mapping bathymetry using a ascii grid (.asc) onto the mesh (t3s)?
I made a comparison in GIS between a DEM created from the bottom elevation at each mesh nodes and my original DEM. You can see the comparison below. I am surprised since I would have expected to have almost no bathymetry difference between the two DEMs AT EACH NODE LOCATION.
My mesh has a resolution varying between 3 and 10 m and the original DEM has a 1 m resolution. When looking at the global comparison, I can see that the difference between the two models is almost nill on plane surfaces (roads) but is almost always positive on sloping terrain. And it seems to be rather negative at the bottom of the rivers. Once more, to obtain differences BETWEEN my mesh nodes is normal, but I would have expected a better result around each node. It some case is the difference very important (0,5 to 1 m).
Can someone explain how is the spatial interpolation performed when using Map Objects? I need to try a comparison with a model bathymetry created with a classical interpolation from xyz points to see how it behaves.
Thanks in advance for your help!
Best regards
PL