Section 1037

Terrain data in tile map format: oasis (all types), earth, earth and stones, sand?

value	type
0x00	earth
0x01	scrub
0x02	earth & stones
0x04	earth or sand? (changes to earth on update)
0x08	earth or sand? (changes to earth on update)
0x10	oasis grass
0x20	beach
0x40	driven sand
0x80	thick scrub

It is a bit flag, because:

value	type
0x03	earth & stones
0x04	earth or sand? (changes to earth on update)
0x08	earth or sand? (changes to earth on update)
0x30	oasis grass
0x50	oasis grass
0x60	driven sand
0x70	oasis grass

When wiped, grass is gone and farms cannot be placed anymore. Everything is one texture.

Example image of this section

See this which is based on this map