Study area falls in two UTM zones

[dilishask]

Hi,
The watershed I am working on falls in two UTM zones. Since TopoToolbox works only on projected coordinate system, can you suggest what is the best way to tackle this issue?

[wschwanghart]

Hi, this is more a geodesic question. If distortions and horizontal accuracies of ~ 1 m are not an issue, just choose one of the two projections. Alternatively, use another projection which is better suited for the extent and location of your study site.

[dilishask]

Thank you for the reply.