For calculations with MEMO, a file must be provided which contains orography height and surface type for each grid location The following surface types are distinguished and must be stored as percentage:
* water (type: 1)
* arid land (type: 2)
* few vegetation (type: 3)
* farmland (type: 4)
* forest (type: 5)
* suburban area (type: 6)
* urban area (type: 7)
Only surface types 1–6 have to be stored. Type 7 is the difference between 100% and the sum of types 1–6. If the percentage of a surface type is 100%, then write the number 10 and for all other surface types the number 99.
The orography height is the mean height for each grid location above sea level in meter.