The tile type.

00

Ground

01

Railway tracks

02

Roads

03

Town building

04

Trees

05

Station tiles

06

Water

07

Void

08

Industries

09

Tunnel / bridge

0A

Objects

Presence and direction of bridge above.

00

no bridge

01

Axis X (North-East)

02

Axis Y (South-West)

Only meaningfull in tropic climate. It contains the definition of the available zones

00

normal

01

desert

02

rain forest

The type of water that is on a tile.

00

Sea

01

Canal

02

River

03

Invalid, i.e. no water on this tile

The owner of a tile can be either companies (human or AI) or "Game entities".

00..0E

Normal companies

0F

a town owns the tile

10

nobody owns the tile

11

"water" owns the tile

FF

spectator in MP or in scenario editor

Class

Meaning & details of encoding

0

 Ground

• m1 bits 4..0: owner of the tile (normally 10)
• m2: see fields
• m3 bits 7..5: type of hedge on NE border of the tile
• m3 bits 3..0: see fields
• m3 bit 4: set if the tile is covered with snow
• m4 bits 7..5: type of hedge on the SW border of the tile (1 through 6, or 0=none)
• m4 bits 4..2: same as 7..5, but for the SE border
• m5 bits 7..5: update counter, incremented on every periodic processing for tile types, other than 03, 07, 0B, 10 and above.
  on wraparound, the tile is updated (for fields, the type of fields in m3 is increased, for other types the tile type in m5 is increased).
  For snow and desert, these bits are not used, tile is updated on every periodic processing.
• m5 bits 4..2: tile type:

• m5 bits 1..0: density:

• m6 bits 4..2: type of hedge on NW border of the tile

1

Railway tracks

• m1 bits 4..0: owner of the tile
• m2: see signals
• m3 bits 7..4: see signals
• m3 bits 3..0 = track type:

• m4 bits 7..4: see signals
• m4 bits 3..0: Ground type (values with fences are not valid for depots and checkpoints)

• m5 bit 7 clear: railway track
• m5 bits 5..0: track layout: bit set = track present:

• m5 bit 6 set = with signals:
  There are at most 4 signals on a tile. The signals 0..3 belong to the directions:

• m2 bit 7: Signal 0 and 1: set = semaphore signals, clear = light signals
• m2 bit 3: Signal 2 and 3: set = semaphore signals, clear = light signals
• m2 bits 6..4: type of signal 0 and 1 (same values as m2 bits 2..0)
• m2 bits 2..0: type of signal 2 and 3

• m3 bits 7..4: bit set = signal 3..0 present
• m4 bits 7..4: bit clear = signal 3..0 shows red
• m2 bits 8..10: track reserved for pbs

• m2 bit 11: opposite track is reserved, too
• m5 bit 7 set, bit 6 set: railway depot
• m2: Depot index
• m5 bits 1..0: exit towards

• m5 bit 4: pbs reservation state

2

Roads

• m2: Index into the array of towns (owning town for town roads; closest town otherwise, INVALID_TOWN if there is no town or we are creating a town)
• m7 bit 5 set = on snow or desert
• m7 bits 7..6: present road types

• m3 bits 7..4: owner of road type 1 (tram); OWNER_NONE (10) is stored as OWNER_TOWN (0F)
• m5 bits 7 clear: road or level-crossing
• m6 bits 5..3:

• m5 bit 6 clear: road
• m1 bits 4..0: owner of the road type 0 (normal road)
• m7 bits 3..0: counter for the roadworks
• m5 bits 3..0: road layout road type 0 (normal road): bit set = road piece present:

• m3 bits 0..3: road layout road type 1 (tram)
• m5 bits 5..4: bits to disallow vehicles to go a specific direction

• m5 bit 6 set: level crossing
• m1 bits 4..0: owner of the railway track
• m3 bits 3..0: railway track type
• m5 bit 0: direction

• m5 bit 5: set if crossing lights are on
• m7 bits 4..0: owner of the road type 0 (normal road)
• m5 bit 4: pbs reservation state
• m5 bit 7 set, bit 6 clear: road depot
• m1 bits 4..0: owner of the depot
• m2: Depot index
• m5 bits 1..0: exit towards:

• m7 bits 4..0: owner of the road type 0 (normal road)

3

Town building

• m1 : Random bits (newhouses)
• m2 : index into the array of towns
• m3 bit 7 :
• set : House is complete
• m5 : Age of house in years, clamped at 255
• clear : House is in construction
• m5 bits 7..5 : free
• m5 bits 4..3 : construction stage
• m5 bits 2..0 : construction counter
• m3 bit 6 : bit 8 of house type (m4), allowing 512 different types.
• m3 bit 5 : free
• m3 bits 4..0 : triggers activated (newhouses)
• m4 : town building type (with m3[6] bit)
• m5 : see m3 bit 7
• m6 :
• If newhouses is activated
• bits 7..2 : Periodic processing time remaining
• Standard behaviour
• bits 7..2 : lift position (for houses type 04 and 05)
• m7 :
• If newhouses is activated
• Current animation frame
• Standard behaviour (only for houses type 04 and 05)
• bits 7..4 : free
• bits 3..1 : lift destination. Values can be 0..6, except 1.
  So the building has 6 effective floors. This is due to the fact that the first floor is 2 'normal' floors high.
  One 'normal' floor has a height of 6 lift positions.
• bit 0 : Lift has destination when set

Newhouses is the name englobing a newGRF feature developped by TTDPatch devs (mainly Csaboka).
It allows the replacement of the properties as well as the graphics of houses in the game.
To distinguish between the standard behaviour and the newGRF one, HouseID (m4 + m3[6]) is tested for anything above 110.
110 is the count of standard houses. So above 110 means there is a new definition of at least one house

4

Trees

• m1 bits 4..0: owner (normally 10)
• m2 bits 8..6: ground

• m2 bits 5..4: ground density
• m2 bits 3..0: update counter, incremented on every periodic processing.
  on wraparound the growth status is updated (or, if it's 3, a random action is taken)
• m3 bits 7..0: type of trees:

• Note: the actually displayed set of trees depends on both type and number of trees
• m5 bits 7..6: number of trees minus one
• m5 bits 2..0: growth status:

5

Station tiles

• m1 bits 6..5: water class for buoys, water part of docks and for airport tiles

• m1 :
• If water class is not WATER_CLASS_CANAL (01)
• bits 4..0 : owner of the station
• If water class is WATER_CLASS_CANAL (01)
• bit 4:

• bits 3..0 : owner of the station; OWNER_NONE (10) is stored as OWNER_TOWN (0F)

• m2: index into the array of stations
• m3 bits 7..4: persistent random data for railway stations/waypoints and airports)
• m3 bits 7..4: owner of tram tracks (road stop)
• m3 bits 3..0: track type for railway stations/waypoints
• m4: custom station id; 0 means standard graphics
• m5: graphics index (range from 0..255 for each station type):

• m6 bits 7..6:

• If water class is WATER_CLASS_CANAL (01)
• bits 3..2 of owner of canal (see m6 bits 1..0)

• m6 bits 5..3: the station type (rail, airport, truck, bus, oilrig, dock, buoy, waypoint)
• m6 bit 2: pbs reservation state for railway stations/waypoints
• m6 bits 1..0:

• If water class is WATER_CLASS_CANAL (01)
• owner of canal (plus m6 bits 7..6); OWNER_NONE (10) is stored as OWNER_TOWN (0F)

• m7 bits 4..0: owner of road (road stops)
• m7 bits 7..6: present road types (road stops)
• m7: animation frame (railway stations/waypoints, airports)

6

Water

• m1 bits 6..5 : Water class (sea, canal or river)

• m1 :
• If water class is not WATER_CLASS_CANAL (01)
• bits 4..0 : owner (for sea, rivers, and coasts normally 11)
• If water class is WATER_CLASS_CANAL (01)
• bit 4:

• bits 3..0 : owner; OWNER_NONE (10) is stored as OWNER_TOWN (0F)

• m2: Depot index (for depots only)
• m4: Random data for canal or river tiles
• m5: tile type:

• m6 bits 7..6:

• If water class is WATER_CLASS_CANAL (01)
• bits 3..2 of owner of canal (see m6 bits 1..0)

• m6 bits 1..0:

• If water class is WATER_CLASS_CANAL (01)
• owner of canal (plus m6 bits 7..6); OWNER_NONE (10) is stored as OWNER_TOWN (0F)

7

Void

Tiles of this class form an invisible, one tile wide border at the south (bottom) edges of the map,
so as to protect several algorithms from the consequences of a wraparound at the edges.

8

Industries

• m1 bit 7: clear = under construction
• m1 bits 6..5 : Water class (sea, canal, river or land)

• If water class is WATER_CLASS_CANAL (01)
• bit 4:

• m1 bits 3..2: construction counter, for buildings under construction incremented on every periodic tile processing
• m1 bits 1..0: stage of construction (3 = completed), incremented when the construction counter wraps around
  the meaning is different for some animated tiles which are never under construction (types 01, 1E..20, 30, 58; see above)
• m2: index into the array of industries
• m3: random bits (NewGRF)
• m4: animation loop
• m5: type (plus m6 bit 2):
  (note: this is not the same as the industry type, which is stored in the array of industries)

• m6 bits 7..6:

• If water class is WATER_CLASS_CANAL (01)
• bits 3..2 of owner of canal (see m6 bits 1..0)

• m6 bits 5..3: random triggers (NewGRF)
• m6 bit 2: bit 8 of type (see m5)

• m6 bits 1..0:

• If water class is WATER_CLASS_CANAL (01)

• owner of canal (plus m6 bits 7..6) ; OWNER_NONE (10) is stored as OWNER_TOWN (0F)
• m7: animation frame

9

Tunnel / bridge

• m1 bits 4..0: owner
• m3 bits 7..4: owner of tram
• m3 bits 3..0: track type for railway
• m5 bit 4: pbs reservation state for railway
• m5 bits 7 clear: tunnel entrance/exit
• m5 bit 7 set: bridge ramp
• m6 bits 5..2: bridge type:

• m5 bits 3..2: transport type

• m5 bits 1..0: direction onto the bridge / out of the tunnel

• m7 bits 4..0: owner of road
• m7 bit 5 set = on snow or desert
• m7 bits 7..6: present road types for road

A

Objects

• m1 bits 6..5 : Water class (sea, canal, river or land)

• m1 :
• If water class is not WATER_CLASS_CANAL (01)
• bits 4..0 : owner of the object (for lighthouses and transmitters normally 10)
• If water class is WATER_CLASS_CANAL (01)
• bit 4:

• bits 3..0 : owner of the object; OWNER_NONE (10) is stored as OWNER_TOWN (0F)

• m2: index into the array of objects, bits 0 to 15 (upper bits in m5)
• m3: random bits
• m5: index into the array of objects, bits 16 to 23 (lower bits in m2)

• m6 bits 7..6:

• If water class is WATER_CLASS_CANAL (01)
• bits 3..2 of owner of canal (see m6 bits 1..0)

• m6 bits 1..0:

• If water class is WATER_CLASS_CANAL (01)
• owner of canal (plus m6 bits 7..6); OWNER_NONE (10) is stored as OWNER_TOWN (0F)

• m7: animation counter

Classes B through F are reserved. The presence of a tile in one of the reserved classes will crash OTTD.