I'm not absolutely sure but as far as I recall a UTM tile only needs one particular corner point to actually exist on a baseboard. This is the SW point for 1000m tiles and the respective corner for 500m quarter tiles. If that baseboard can be found in the route, then TransDEM creates the tile. Therefore, at least in theory, gaps in UTM tile coverage across route modules can be avoided. But I may be wrong here.
I thought about 720m or 360m tiles once or twice. Technically, it wouldn't be such great challenge (apart from mainly routine work to add more options all through the class hierarchy). However, one of the reasons I went for the 1000m UTM grid in the first place was the advantage of human readable tile names. With 720/360m tiles, UTM coordinates of tile corners will be multiples of 40m, yielding rather cryptic names when applying the current naming scheme.
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