This directory contains surface characterization data for Earth

LandSeaMask_ERA40_*.xml
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- global land-sea masks for Earth (1=land, 0=sea)
- originating from ECMWF ERA40, derived via A.v.Engeln
- resolution of 0.25 and 1.0 degree in both lat and lon (number given in filename)
- extended with data(lon=360)==data(lon=0) for indicating data is cyclic

SurfaceAltitude_ERA40_*.xml
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- global surface altitude in meters matching the LandSeaMask
- extended with data(lon=360)==data(lon=0) for indicating data is cyclic