Lineage 2 - L2J geodriver map format

File name: xx_yy.l2j

Blocks of 256x256 data (little-endian)

1. byte: block type

0 - "flat" block, bytes 2+3 -> height (short)

1 - "complex" block, bytes 2-129: array of 8x8 two-byte height (short) values, double of the flat block value

2 - "multilayer" block, 256 (8x8) variable-length blocks of data:

byte - amount of layers (1-125)

array of two-byte height (short) values, one per layer, double of the flat block value

All values seem to be clamped to the nearest multiple of 8.

Default sea floor is at -3720, but there are places on the map which go way below that.