This drawing contains three surfaces:
- A surface imported from Google Earth
- A surface created from a DEM
- A surface (FG) created by first pasting the Google Earth surface, then the DEM
The DEM is a 10m surface. I smoothed the FG surface using NNI, with a 12m grid. This is the result:
Anyone care to explain what's going on, or what I'm doing wrong that I'm ending up with the strange contour 'web' over the river?