DTG would it be possible to have SRTM/Lidar resetting tool like in tsc? when your building a route using srtm in tsc and you messed up on something you can regenerate the terrain again in that area. now in TSW PC editor unreal engine you would import the srtm/LIDAR files and hit create landscape area and the area would have srtm landscape. but if you messed up on area regenerate the terrain by clicking on on create landscape doesn't work. i guess you can delete the tile area but doesn't work when you click on create landscape.
I didn't quite figured how to recover a SRTM tile either. One workaround I do, when I need a recover is: A. Making regular backups of my entire plugin (including all landscape and scenery tiles) and if something went wrong I can B. manually replace the files in the plugin folder with the older ones.
Basically you must to delete the landscape tile in order to re-generate it with the original SRTM data. I have the same struggle but found at least a "temporary" fix for it. I don't know of any other way to go around this issue. https://forums.dovetailgames.com/threads/deleted-tiles-cant-be-created-anymore.79145/