A few issues there, but its a start!
I see the problem, rebuilding.
so, for materials,
Airport -> launchpads, airports
drycrop -> shrubs, grass, trees in equal proportion
forest-> medium sized trees, fairly dense
grasscover -> mostly bare grass with mixed shrubs / a few trees as well
There is unfortunately a lot of "default" -> I'd map it the same as drycrop as that's basically what it mostly is.