Combine elevation data
I need to combine two elevation layers (sounding grids):
- one larger area which contains older data (Old Layer)
- one smaller area which contains updated data (New Layer)
The combined layer has to contain the New Layer and Old Layer for the locations where the New Layer has no information / is not valid. (In other words, the large area, cropped by and updated with the latest sound grid).
With the operations in the Combine/Compare Terrain Layers, I can't figure out how to achieve this. Any suggestions?
(and if there would be an alternative route using points rather than grids, that is also an option for me).