The map of the surrounding of Garmisch-Partenkirchen, map.asc,
contains 4 columns. Those 4 numbers describe a map pixel with a length
of half a minute in east-west and north-south direction. This equals a
side-length of approximately 916m NS and 626m EW. The 4 columns are:
geographical longitude in degrees (East positive), 
geographical latitude in degrees (North positive), average altitude of
the pixel over sea level in meters, land use category (majority value)
in numbers. The following land use categories are distinguished

1:urban
2:agriculture
3:grassland
4:deciduous forest
5:coniferous forest
6:mixed forest
7:water
8:marsh or wetland
9:desert, sand,open spaces with little or no vegetation
10:tundra
11:ice
12:tropical or subtropical forest
13:scrub and/or herbaceous vegetation associations
14:missing data 
15:missing data

If you use this map for any publication, written or otherwise, please
quote: 

Renate Koeble, Gerhard Smiatek: "Land use data" 
in: Vol.7 of the Eurotrac Series 1996, "Tropospheric Modelling and
Emission Estimation" Eds. Peter Borrell, Patricia M. Borrell, Tomislav
Cvitas, Kerry Kelly and Wolfgang Seiler, p. 261-267.