OFP Forum, OFP Home, OFP File Formats, OFP Tools, OFP Missions, OFP 3D Modeling, OFP Terrain
Operation Flashpoint (OFP) aka ArmA: Cold War Assault (CWA)
OFP terrains were in the early days called islands. Default bis terrains are all 50 meter cell size and 256 x 256 cells per terrain making them 12.8km x 12.8km in total size. OFP terrains are made out of WRP files, to edit WRP files get WrpTool which is hands down the best terrain editor available.
OFP Resistance texture descriptions explains what type of terrain each texture represents.