Landscape

• O - bit is free
• X - bit is used
•     - bit of _map_* is abused for different purposes
• NOTE: counting the bits starts with bit0 in the most left position (eg. a bit screwed LE format; BIT by BIT)

• _map_owner[] - 8 bits in size, used to identify the owner of that tile (eg piece of rail, bridge, etc.).
• _map2[] - 16 bits in size, used to identify the index of the given tile (object) in the (object-)array.
• _map3[] - 16 bits in size, which is split up into _map3lo[] and _map3hi[] is used for general storage.
• _map_type_and_height[] - 8 bits in size, stores tile height (lower 4 bits) and tile class (upper 4 bits).
• _map5[] - 8 bits in size, is used for general storage.