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Data files grl_b2_xx_w(o)em_yyy.dat
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xx:  Horizontal resolutions 05/10/20/40 km.
yyy: Present-day ice surface zs/zs_ref, ice base zb,
     lithosphere surface zl/zl0_llra/zl0_elra,
     ice-land-ocean mask.

Geometry of the Greenland ice sheet by Bamber et al. (2013).
Interpolation on the EPSG:3413 grid,
further processing and downsampling by Ralf Greve.

Files ..._wem_... include Ellesmere Island as ice-free land,
while files ..._woem_... are without Ellesmere Island
(changed to ocean).

Reference
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Bamber, J. L. and 10 others. 2013.
A new bed elevation dataset for Greenland.
The Cryosphere 7 (2), 499-510, doi: 10.5194/tc-7-499-2013.
