In our Red Cross water rescue team at Ringerike in Norway, we have this autum and winter made a map of a river for public use, and as a tool for all search and resque team, police and firedepartment.

Unfortunately we got some "hole" in the map, especially in the generated overlay in google earth. I figure that this happends when there are to wide distance between the tracks.

Are there any opportunity to fix this whitout going to the river again (the river is frosen at this part of the season).

Top right of the screen, select Edit. Increase Max Interpolation higher. Max setting is 250 m.