Z Reference points in Surface

Im trying to construct a landscape model and i just want to model the surface point. How can i modify the reference grid so that it looks better. I uploaded to Grashopper using Docofossor asc import.

Here are some reference pics.


Im trying to construct a landscape model and i just want to model the surface point. How can i fix ?

Can you upload the files that you are using?

Landscape Processing.gh (12.0 KB)
DTM_1.zip (2.5 MB)

Here is the grasshopper file and also the asc. points that i used. I apprieciate any help!