^ I don't think that's right. It is the land cover data (GlobCover 2009) that has it wrong - it should not have been classed as anything but desert. The bathymetric data is
correct despite that it doesn't translate into Freeciv since there is no way to show a depression within flat land aside from swamp or water tiles (which is likely the same problem with the land cover data being misclassified.) But perhaps the bathymetric data can be used to qualify the land data in such cases where:
1] inland area is below sea level,
2] surrounding terrain is either desert, frozen, or "wet" (vegetation present.)
3] Make the depression representative of the surrounding land when that land is desert, or frozen
4] Make the depression a lake or swamp when the surrounding land is not desert or frozen
Maybe?
Hmm, that method might cause a problem with the Dead Sea though, where there is inland -saltwater- in a desert. Any freshwater lake in a desert would be suspect since the presence of the lake would likely transform the desert to plains or grassland. Not so with saltwater though.
Sea ice data sets: https://nsidc.org/data/G02135
The "Extent" images would probably be easiest to deal with since the other series "accumulation", etc., use percent values. Extent is an easier match to Freeciv "arctic"/glacier tiles.
^ March 1st, 2021 north pole sea ice extent.
2021 Maximum sea ice extent:
http://usicecenter.gov/PressRelease/ArcticMaximum2021
Best method might be to first simplify the land cover classes to a minimal set that translates well to Freeciv. Too much ambiguity among the classes, coupled with the increasing degree of uncertainty, is maddening.
