To improving the terrain data, i actually try to follow the manual that using the cross section data and make it to terrain so that can be combine with the base terrain then i can have a new terrain with more accurate rivers. but dont know why when i try combining it is not combined terrain i get in result, it is just terrain (channel only) too
i already do the priority for the terrain (channel only) has higher priority with the base terrain and none rounding i choose because doesnt want more rounding again it is just 90 M SRTM data
my terrain is from 90m data and terrain channel only in 5 m , i already try in 1 m and 90 m but i know that in 90 it is the result cannot show the true result, because my river is only about 10-30 m width