This has been reported here and a ticket was created: Using StampsExport with an external dem - #13 by jun_lu
You can also try the suggested fix, but I think it requires modification of the source code of SNAP.
This has been reported here and a ticket was created: Using StampsExport with an external dem - #13 by jun_lu
You can also try the suggested fix, but I think it requires modification of the source code of SNAP.