-----------------------------
Data files grl_bm3_xx_yyy.dat
-----------------------------

xx:  Horizontal resolutions 05/10/20/40 km.
yyy: Present-day ice surface zs, ice base zb,
     lithosphere surface zl/zl0_llra/zl0_elra,
     ice-land-ocean mask.

Geometry of the Greenland ice sheet by Morlighem et al. (2017)
(BedMachine Greenland v3).
Processing and downsampling by Ralf Greve.

Non-Greenlandic land and continental shelves
(Ellesmere Island, Svalbard, Iceland, Baffin Island)
changed to deep ocean.

Reference
---------

Morlighem, M. and 31 others. 2017.
BedMachine v3: Complete bed topography and ocean bathymetry mapping of
Greenland from multibeam echo sounding combined with mass conservation.
Geophysical Research Letters 44, doi: 10.1002/2017GL074954.
