tudelft3d / geo1101.2020.ahn3 Goto Github PK

I've found an issue with the flattening of water in the DSM file.

This happend with the new AHN4 09DZ1, subtile 1 (with default 4x5 subtiling).

There are some 6m high ridges in the resulting geotif as you can see here:

This is not present in the DTM file, so also tried to create the DSM with Laplace interpolation instead of the QuadIDW:

With Laplace the results are different but still a 6m difference.

Maybe this is an result of the overhanging tree which is classified as water? However, the trees are filtered out the LAS for the DTM, which does not have this problem:

Could this be handled with filtering the outliers with different parameters?

Edit:
It seems that there's a hole in the data where these ridges appear.

Would it be possible to only use ground and water for the interpolation? And ignore the other classes for this?

Nice repo!
I was wondering if you have processed all the tiles, and if you offer links to download these tiles?
If not, can you guide me with the naming pattern of original tiles? For instance, tiles are named like this - 06HZ2, 11DN1, etc. Is there a way I can get all the tile names, or if there is a pattern being followed that I am missing?
Thanks.