Development diary or developer diary for PMC Farming Simulator 25 terrain mods. See also Dev Diary FS19 and Dev Diary FS22 pages for reference, there is a lot of development information for you to read.
More editing info and discussion about dev diaries at PMC Tactical Forum.
My First Terrain (for FS25), how I took mapUS and notepad++ to a wild ride.
Large Terrain Studies, trying to get large terrains in-game and working.