to Top Menu	Program "gflat" Generates a standard GRID format file of flat (plane) surface data.
Working Dir.
LOG Filename
Name-label for new file	(areaname)
Projection number	(+800 for Old-TOKYO)
(Origin Lat. unless UTM)	(in deg. and min.)
(Origin Long. unless UTM)	(in deg. and min.)
Grid Location Parameters	/   SW corner Northing / Easting (km)    /   Mesh size (m) in NS / EW    /   Number of mesh to N / E [count both end]
(Const.) Grid data value
Obs. altitude value (m)
Output Filename	(new)