Properties:
- whole sphere
- equal area projection
- map border is an ellipse, major axis / minor axis length ratio 2:1
- equator mapped to major axis,
- center meridian is mapped to minor axis
- meridians and parallels are mapped to 4th order curves
Published 1892 by Ernst von Hammer (1858-1925).
NOTE that this projection counts longitude from -180 to 180 deg, instead of the 0 to 360 deg
range used by the other projections!
eof.