### Landscape

Seven attributes (counting "type_height") hold the informations about a tile.
These attributes are referred to as "type_height", "m1", "m2", "m3", "m4", "m5" and "m6".
The most important value is the class of a tile, stored in the upper 4 bits of the type_height attribute. The lower 4 bits are used to encode the height and slope data.

Special Attribute : m6. There are 4 bits of it that are used accross multiple tile classes

- Bits 7..6 :

  Presence and direction of bridge above, for tiles that support this.
  `00` | no bridge
  `01` | Axis X (North-East)
  `02` | Axis Y (South-West)

- Bits 1..0 :

  Only meaningfull in tropic climate. It contains the definition of the available zones
  `00` | normal
  `01` | desert
  `02` | rain forest

  In any other climate, those 2 bits are free of use.

For a graphical representation of the tile-layout have a look at Landscape grid page.

The owner of a tile, as frequently associated with attribute m1, can be either players (human or AI) or "Game entities". They are identified using:

`00` | current player
`01..08` | AI or network players
`0F` | a town owns the tile
`10` | nobody owns the tile
`11` | "water" owns the tile
`FF` | spectator in MP or in scenario editor

OTTD's class-specific periodic tile processing routine is called once every +256 ticks for each tile.

Class | Meaning & details of encoding
--- | ---
`0` | Ground
- | m1: owner of the tile (normally `10`) m2: see fields m3 bits 3..0: see fields 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:
  `0` | bare land / grass
  `1` | rough land (density must be 3)
  `2` | rocks (density must be 3)
  `3` | fields (density must be 3) m2: index into the array of industries (farms), INVALID_INDUSTRY (0xFFFF) if farm has been removed m3 bits 3..0: field type (legal values: 0 through 9)
  `4` | snow
  `5` | desert (density must be 1 or 3)
- m5 bits 1..0: density:
  `0` | bare land |  |  |  | 1/4 snow |
  `1` | 1/3 grass |  |  |  | 2/4 snow; | 1/2 desert
  `2` | 2/3 grass |  |  |  | 3/4 snow |
  `3` | full grass; | rough land; | rocks; | fields; | full snow; | full desert
m6 bits 7..6 : Possibility of a bridge above, in the direction specified m6 bits 1..0 : Tropic zone definition
`1` | Railway tracks
- | m1: owner of the tile m2: see waypoint and signals m3 bits 7..4: see signals m3 bits 3..0 = track type:
  `0` | conventional railway
  `1` | electrified railway
  `2` | monorail
  `3` | maglev
- m4 bits 7..4: see signals m4 bits 3..0: Ground type (values with fences are not valid for depots and checkpoints)
  `0` | on bare land
  `1` | on grass, no fences
  `2` | fence on the NW side
  `3` | fence on the SE side
  `4` | fences on the NW and SE sides
  `5` | fence on the NE side
  `6` | fence on the SW side
  `7` | fences on the NE and SW sides
  `8` | fence on the E side (track in the W corner)
  `9` | fence on the W side (track in the E corner)
  `A` | fence on the S side (track in the N corner)
  `B` | fence on the N side (track in the S corner)
  `C` | on snow or desert
  `D` | on grass with fence and shore or water on the free halftile
  `E` | higher part on foundation with snow, lower without snow
- - m5 bit 7 clear: railway track m5 bits 5..0: track layout: bit set = track present:
    bit 0: | in the X direction
    bit 1: | in the Y direction
    bit 2: | in the north corner (direction W-E)
    bit 3: | in the south corner (direction W-E)
    bit 4: | in the west corner (direction N-S)
    bit 5: | in the east corner (direction N-S)
  - m5 bit 6 set = with signals: There are at most 4 signals on a tile. The signals 0..3 belong to the directions:
    | Track `0` (X) | Track `1` (Y) | Track `2` (north) | Track `3` (south) | Track `4` (west) | Track `5` (east)
    Signal `0` |  |  |  | west |  | south
    Signal `1` |  |  |  | east |  | north
    Signal `2` | south-west | north-west | west |  | south |
    Signal `3` | north-east | south-east | east |  | north |
    - m2 bit 6: Signal 0 and 1: set = semaphore signals, clear = light signals m2 bit 2: Signal 2 and 3: set = semaphore signals, clear = light signals m2 bits 5..4: type of signal 0 and 1 (same values as m2 bits 1..0) m2 bits 1..0: type of signal 2 and 3
      `00`: | normal signals
      `01`: | pre-signals
      `10`: | exit-signals
      `11`: | combo-signals
- - m3 bits 7..4: bit set = signal 3..0 present m4 bits 7..4: bit clear = signal 3..0 shows red m5 bit 7 set, bit 6 clear: checkpoint m2: index into the array of waypoints. m5 bit 0:
    `0` | in X direction
    `1` | in Y direction
- - m5 bit 7 set, bit 6 set: railway depot m5 bits 1..0: exit towards
    `0` | NE
    `1` | SE
    `2` | SW
    `3` | NW
m6 bits 7..6 : Possibility of a bridge above, in the direction specified m6 bits 1..0 : Tropic zone definition
`2` | Roads
- | m3 bit 7 set = on snow or desert m7 bits 7..5: present road types
  bit 0 | normal road
  bit 1 | tram
  bit 2 | reserved
- - m5 bits 7 clear: road or level-crossing m2: Index into the array of towns, 0 for non-town roads m3 bits 6..4:
    `0` | on bare land
    `1` | on grass
    `2` | paved
    `3` | with streetlights
    `5` | tree-lined
    `6` | on grass with road works
    `7` | paved with road works
  - - m5 bits 3..0: owner of road type 1 (tram); OWNER_NONE (`10`) is stored as OWNER_TOWN (`0F`) m7 bits 4..0: owner of road type 2 (reserved) m5 bit 6 clear: road m1: owner of the road type 0 (normal road) m3 bits 3..0: counter for the roadworks m4 bits 3..0: road layout road type 0 (normal road): bit set = road piece present:
      bit 0: | NW piece
      bit 1: | SW piece
      bit 2: | SE piece
      bit 3: | NE piece
    - m4 bits 7..4: road layout road type 1 (tram) m6 bits 5..2: road layout road type 2 (reserved) m5 bits 5..4: bits to disallow vehicles to go a specific direction
      bit 0: | set = disallow driving in south-west or south-east direction
      bit 1: | set = disallow driving in north-west or north-east direction
  - - m5 bit 6 set: level crossing m1: owner of the railway track m3 bits 3..0: railway track type m4 bit 6: direction
      `0` | road in the X direction, rail in Y
      `1` | road in the Y direction, rail in X
- - m4 bit 5: set if crossing lights are on m4 bits 4..0: owner of the road type 0 (normal road) m5 bit 7 set, bit 6 clear: road depot m1: owner of the depot m5 bits 3..0: exit towards:
    `0` | NE
    `1` | SE
    `2` | SW
    `3` | NW
m6 bits 7..6 : Possibility of a bridge above, in the direction specified m6 bits 1..0 : Tropic zone definition
`3` | Town building
| m1 : Random bits (newhouses) m2 : index into the array of towns m3 bit 7 : set : House is complete m5 : year of house construction (relative to 1920); clamped to 0..255 (1920..2175) 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 : bit 6 of current animation frame (see m6) 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 : Current animation frame (bits 5..0); bit 6 in m3 Standard behaviour bits 7..2 : lift position (for houses type 04 and 05) bits 1..0 : tropic zone specifier m7 : If newhouses is activated Periodic processing time remaining 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: owner (normally `10`) m2 bits 7..6: ground density m2 bits 5..4: ground
  `0` | on grass
  `1` | on rough land (density must be 3)
  `2` | on snow or desert
  `3` | on shore (density must be 3)
- 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:
  `00`..`0B` | temperate climate trees
  `0C`..`13` | sub-arctic climate trees
  `14`..`1A` | rainforest trees
  `1B` | cactus plants
  `1C`..`1F` | sub-tropical climate, non-rainforest, non-desert trees
  `20`..`28` | toyland trees
- Note: the actually displayed set of trees depends on both type and number of trees m4 bits 7..5: type of hedge on the SW border of the tile (1 through 6, or 0=none) m4 bits 4..2: type of hedge on the SE border of the tile (1 through 6, or 0=none) m5 bits 7..6: number of trees minus one m5 bits 2..0: growth status:
  `0`..`2` | one of trees is growing
  `3` | all trees are fully grown
  `4`..`6` | one of trees is withering
m6 bits 1..0 : Tropic zone definition
`5` | Station tiles
- | m1: owner of the station m2: index into the array of stations m3 bits 7..4: persistent random data for newstations m3 bits 3..0: track type for railway stations m3 bits 2..0: present road types for road stops m3 bits 1..0: water class for buoys and water part of docks m4: custom station id; 0 means standard graphics m5: graphics index (range from 0..255 for each station type):
  `00`..`07` | railway station
  `00`..`01` | open platform
  `02`..`03` | open platform with station building
  `04`....`07` | roofed platform
  bit 0: clear = in X direction, set = in Y direction
  `00`..`8F` | all airports
  `00`..`05` | road stops:
  `00` | exit towards NE
  `01` | exit towards SE
  `02` | exit towards SW
  `03` | exit towards NW
  `04` | drive through X
  `05` | drive through Y
  `00`..`05` | ship dock
  `00` | SW coast part
  `01` | NW coast part
  `02` | NE coast part
  `03` | SE coast part
  `04` | X direction water part
  `05` | Y direction water part
m6 bits 5..3: the station type (rail, airport, truck, bus, oilrig, dock, buoy) m6 bit 2: 1 when a drive through road stop is built over a town owned road, otherwise 0 m6 bits 1..0 : Tropic zone definition
`6` | Water
- | m1: owner (for sea, rivers, and coasts normally `11`) m3 bits 1..0 : Water class (sea, canal or river) m4: Random data for canal or river tiles m5: tile type:
  `00` | water, canal or river
  `01` | coast or riverbank
  `10`..`1B` | canal locks
  `10` | middle part, (SW-NE direction)
  `11` | middle part, (NW-SE direction)
  `12` | middle part, (NE-SW direction)
  `13` | middle part, (SE-NW direction)
  `14` | lower part, (SW-NE direction)
  `15` | lower part, (NW-SE direction)
  `16` | lower part, (NE-SW direction)
  `17` | lower part, (SE-NW direction)
  `18` | upper part, (SW-NE direction)
  `19` | upper part, (NW-SE direction)
  `1A` | upper part, (NE-SW direction)
  `1B` | upper part, (SE-NW direction)
  `80`..`83` | ship depots
  `80` | ship depot, NE part (X direction)
  `81` | ship depot, SW part (X direction)
  `82` | ship depot, NW part (Y direction)
  `83` | ship depot, SE part (Y direction)
m6 bits 7..6 : Possibility of a bridge above, in the direction specified m6 bits 1..0 : Tropic zone definition
`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` | Industry tile
- | m1 bit 7: clear = under construction 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: animation state 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)
  `00`..`06` | coal mine
  `00` | wheel tower when not animated
  `01` | wheel tower when animated animation state in m3 bits 5..0; m3 bit 6 set = sound already generated
  `07`..`0A` | power station
  `08` | chimney
  `0A` | transformer; animation progress in m3(valid range `0`..`7`)
  `0B`..`0F` | sawmill
  `10`..`11` | forest
  `11` | trees cut down
  `12`..`17` | oil refinery
  `18`..`1C` | oil rig
  `1D`..`20` | oil wells
  `1D` | not animated
  `1E`..`20` | various stages of animation; progress of animation in m3
  `21`..`26` | farm
  `27`..`2A` | factory (temperate climate)
  `2B`..`2E` | printing works
  `2F`..`33` | copper ore mine
  `2F` | wheel tower when not animated
  `30` | wheel tower when animated; animation state in m3 bits 5..0; m3 bit 6 set = sound already generated
  `31` | chimney
  `34`..`39` | steel mill
  `3A`..`3B` | bank (temperate climate)
  `3C`..`3F` | food processing plant
  `40`..`47` | paper mill
  `48`..`58` | gold mine
  `4F` | wheel tower when not animated
  `58` | wheel tower when animated; animation state in m3 bits 5..0; m3 bit 6 set = sound already generated
  `59`..`5A` | bank (sub-arctic or sub-tropical climate)
  `5B`..`63` | diamond mine
  `64`..`73` | iron ore mine
  `74` | fruit plantation
  `75` | rubber plantation
  `76`..`77` | water supply
  `78` | water tower
  `79`..`7C` | factory (sub-tropical climate)
  `7D`..`80` | lumber mill
  `81`..`82` | candyfloss forest
  `82` | candyfloss 'trees' cut down
  `83`..`86` | sweet factory
  `87`..`88` | battery farm
  `88` | batteries 'reaped'
  `89` | cola wells
  `8A`..`8D` | toy shop
  `8E`..`93` | toy factory
  `8F` | Animated part; animation state in m3 (valid range `00`..`31`) Tile animation is started (m4 zeroed) on the periodic processing. While the animation is in progress, m4 holds the number of animation cycles that have already taken place. when this number reaches 8 the animation is stopped.
  `94`..`9B` | plastic fountains (various stages of cyclic animation)
  `9C`..`9F` | fizzy drink factory
  `A0`..`A3` | bubble generator
  `A1` | generators
  `A2` | bubble capture facility; animation state in m3 (valid range `00`..`27`)
  `A4`..`A6` | toffee quarry
  `A5` | animated part; animation state in m3 (valid range `00`..`45`)
  `A7`..`AE` | sugar mine
  `AE` | animated part; animation state in m3 (valid range `00`..`5F`)
  `AF`..`1FF` | NewGRF industries industry
m6 bits 5..3: random triggers (NewGRF) m6 bit 2: bit 8 of type (see m5) m6 bits 1..0 : Tropic zone definition m7: random bits (NewGRF)
`9` | Tunnel / bridge
- - | m1: owner m2 bits 7..4: see bridge ramp m3 bits 3..0: track type for railway m3 bits 2..0: present road types for road m4 bit 7 set = on snow or desert m5 bits 7 clear: tunnel entrance/exit m5 bit 7 set: bridge ramp m2 bits 7..4: bridge type:
    Type | Max. speed (mph) | Description
    --- | --- | ---
    `0` | 20 | wooden
    `1` | 30 | concrete
    `2` | 40 | girder, steel
    `3` | 50 | suspension, concrete
    `4` | 60 | suspension, steel
    `5` | 70 | suspension, steel
    `6` | 100 | cantilever, steel
    `7` | 130 | cantilever, steel
    `8` | 150 | cantilever, steel
    `9` | 160 | girder, steel
    `A` | 200 | tubular, steel
    `B` | 320 | tubular, steel
    `C` | 380 | tubular, silicon
- m5 bits 3..2: transport type
  `0` | railway
  `1` | road
- m5 bits 1..0: direction onto the bridge / out of the tunnel
  `0` | NE
  `1` | SE
  `2` | SW
  `3` | NW
m6 bits 7..6 : Possibility of a bridge above, in the direction specified m6 bits 1..0 : Tropic zone definition
`A` | `Unmovables`
- | m1: owner of the object (for lighthouses and transmitters normally `10`) m2: see company statue m5: tile type:
  `00` | transmitter
  `01` | lighthouse
  `02` | company statue m2: TownID on which the statue is built in
  `03` | company-owned land
  `80`..`93` | company headquarters (5 sets of 4 tiles each, updated quarterly depending on the company performance)
m6 bits 7..6 : Possibility of a bridge above, in the direction specified m6 bits 1..0 : Tropic zone definition
Classes `B` through `F` are reserved. The presence of a tile in one of the reserved classes will crash OTTD.

Original Copyright © 2003 by Marcin Grzegorczyk for TTDLX.
Transport Tycoon and Transport Tycoon Deluxe are Copyright © by Chris Sawyer.
All the other trademarks are the property of their respective owners.