to Top Menu	Program "altchg" Change Altitude information of GRID data.
Working Dir.
LOG Filename
Input source Filename
New Altitude info type	0: Const value 1: Std GRID file (1st set) 2: Std GRID file (2nd set) Const Altitude (in m) Alt. data Filename
Name-label for new file	(areaname)
Output Filename	(new)