TransDEM Forum

I suspect I know the answer to this, but it may be something others have experienced:

Using TransDem (86) and T12 (61388) and Windows 7, I recently tried to re-create all the 200 UTM tiles I am using on a route.

After figuring out the T12 import process, I commited the scenery folder created by TransDem. Everything worked fine except that I have 2 or 3 copies of the same UTM files throughout the route - all placed neatly in the correct places!

I will try this again but I suspect this results from committing the route first, and then the scenery folder with UTM files? Otherwise I will have to go through my route and delete all the excess UTM tiles which is quite fiddly!

Any quick advice on this issue?

Newer versions of TransDEM have some built-in check mechanism which is supposed to compare the <Name> attribute of an existing UTM tile with the actual position when placing a new one into the route at the same location. The name consists of the encoded UTM coordinates. This - in theory - should prevent double entries. It's a multi-step procedure which includes "best guess" elements and I'm halfway sure there are still some loopholes.

No obvious remedy here, unfortunately. It would probably need a full analysis for your particular case, I'm afraid.