GEODATA.DAT
Geodata info:
[0] - x dimension of the map / 10
[2] - y dimension of the map / 10
[4] - z dimension of the map
[6] - X-com craft type (ignore this if a base mission)
0 - SkyRanger 1 - Lightning 2 - Avenger 3 - Interceptor 4 - Firestorm
[8] - Alien craft type (ignore this if not a ufo mission)
0 - (No UFO) 5 - Small Scout 6 - Medium Scout 7 - Large Scout 8 - Harvestor 9 - Abductor 10 - Terror Ship 11 - Battleship 12 - Supply Ship
[10] - Terrain type
0 - Jungle 1 - Farm 2 - Forest 3 - X-Com Base 4 - Alien Base 5 - Urban 6 - Desert 7 - Mountains 8 - Polar 9 - Mars
(no other values decoded at this time)