Lot Subfile

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This page pertains to the format of the Lot Subfile within the Savegame files. This file has Type ID C9BD5D4A. It can be viewed and mapped using the SC4 Savegame Explorer, but not edited. This particular subfile was decoded by RippleJet.

Contents

Description

This subfile contains data about all the lots in the city. Used for both ploppable and growable lots.

Structure

The Lot Subfile has the following format:

DWORD	Size
DWORD	CRC
DWORD	Memory
WORD	Major Version?  (only seen 0x0008)
DWORD	Lot IID
BYTE	Flag byte 1  (See Appendix 1 below)
BYTE	Min X Tile
BYTE	Min Z Tile
BYTE	Max X Tile
BYTE	Max Z Tile
BYTE	Commute X Tile
BYTE	Commute Z Tile
FLOAT32	Y Position
FLOAT32	Y Coordinate if slope conforming, height above Y Position (0x00000000 if Lot Foundation)
FLOAT32	Y Coordinate if slope conforming, height above Y Position (0x00000000 if Lot Foundation)
BYTE	Lot Width
BYTE	Lot Depth
BYTE	Lot Orientation
BYTE	Flag byte 2  (See Appendix 2 below)
BYTE	Flag byte 3  (See Appendix 3 below)
BYTE	Zone Type
BYTE	Zone Wealth
DWORD	Date Lot Appeared (was plopped or grew)
DWORD	Building IID
BYTE	Unknown, several values seen, but the same value often appears in several lots
DWORD	Memory Address for linked industrial lot
DWORD	0x4A232DA8, Industry Subfile Type ID. Appears only if the previous DWORD is not 0x00000000
DWORD	Memory Address of the Anchor or Farm Lot
DWORD	0xC9BD5D4A, Lot Subfile Type ID. Appears only if the previous DWORD is not 0x00000000
BYTE	Count  (0x00 or 0x01)
BYTE	Count of RCI Types  (0x01, 0x02 or 0x03)
DWORD	Demand Source Index  (See Appendix 4 below)
WORD	Capacity
BYTE	Count of RCI Types  (0x00, 0x01, 0x02 or 0x03)
DWORD	Demand Source Index  (See Appendix 4 below)
WORD	Total Capacity  (including filler lots, e.g. farm fields, mechanics and outs)
FLOAT32	Total § Capacity  (for C, I and Civics, 0x00000000 for R) - see also SGPROP 0x8A0B4100
FLOAT32	Total §§ Capacity  (for C, I and Civics, 0x00000000 for R) - see also SGPROP 0x8A0B4100
FLOAT32	Total §§§ Capacity  (for C, I and Civics, 0x00000000 for R) - see also SGPROP 0x8A0B4100
WORD	0x0002  (Unknown)
DWORD	Count of Properties  (I've seen up to 0x00000007)
SGPROP	SaveGame Properties, repeated Count times  (See Appendix 5 below)
DWORD	Count of Commute Blocks  (number of destinations commuted to from here)
DWORD	Count of Commute Paths  (usually 0x00000002 = morning and evening)
DWORD	Count of Bytes in the Path
BYTES     	Commute Path  (See Appendix 6 below)
DWORD	Number of Commuters
BYTE	Unknown, 0x00 or 0x03
BYTE	Unknown, 0x00, 0x01 or 0x02
BYTE	Unknown, 0x08, 0x09, 0x0A or 0x0B  (0x00 if the commute path has disappeared)
BYTE	Unknown, 0x00 or 0x03  (0x04 if the commute path has disappeared)
SINT16	Commute Destination, X Tile  (See Appendix 7 below)
SINT16	Commute Destination, Z Tile  (See Appendix 7 below)
FLOAT32	Trip Length
DWORD	Unknown  (See Appendix 8 below)
BYTE	Unknown  (takes many different values)

Appendix 1 - Flag Byte 1

    0x01 (00000001b) - Might have to do with road access
    0x02 (00000010b) - Might have to do with road (job?) access
    0x04 (00000100b) - Might have to do with road access
    0x08 (00001000b) - Means the lot is watered
    0x10 (00010000b) - Means the lot is powered
    0x20 (00100000b) - Means the lot is marked historical
    0x40 (01000000b) - Might mean the lot is built

Appendix 2 - Flag Byte 2

This one is normally 0x03, but 0x00, 0x01, 0x02, 0x04 and 0x06 have also been seen. It seems to be going hand-in-hand with Flag Byte 1:

    0x01 (00000001b) - Flag Byte 1 = 0x10 - Powered (empty growable zones)
    0x02 (00000010b) - Flag Byte 1 = 0x50 - Powered and built
    0x03 (00000011b) - Flag Byte 1 = 0x58 - Powered, watered and built
    0x04 (00000100b) - Seen it once on a tall office under construction
    0x06 (00000110b) - Seen it once on a water tower without power

Appendix 3 - Flag Byte 3

This is normally 0x00, but 0x01, 0x03 and 0x06 have also been seen. All those having 0x01 or 0x03 were growable lots under construction. Thus, the lowest bit seems obvious after a number of confirmations:

    0x01 (00000001b) - A growable lot that is under construction
    0x02 (00000010b) - ?
    0x04 (00000100b) - ?

Appendix 4 - Demand Source Index

    0x00001010 = R§
    0x00001020 = R§§
    0x00001030 = R§§§
    0x00003110 = CS§
    0x00003120 = CS§§
    0x00003130 = CS§§§
    0x00003320 = CO§§
    0x00003330 = CO§§§
    0x00004100 = IR
    0x00004200 = ID
    0x00004300 = IM
    0x00004400 = IHT

Appendix 5 - Structure of SGPROP (SaveGame Properties)

This structure is used on the SGPROP entries. Known entries are listed further below.

DWORD   Property Name Value
DWORD	Property Name Value  (doubled for some unknown reason)
DWORD	0x00000000
BYTE	Data Type, 01=UInt8, 02=UInt16, 03=UInt32, 07=SInt32, 08=SInt64, 09=Float32, 0B=Boolean
BYTE	KeyType, 0x00 = 0 reps, 0x80 = more than 0 reps
WORD	0x0000
DWORD	Rep Count  (this one appears only if KeyType = 0x80)
DATA	Property Value (repeated Rep Count times, type according to Data Type)

Appendix 6 - Structure of Commute Paths

BYTE	Starting Traffic Type  (see below)
BYTE	Path Start Tile X (network in front of the lot)
BYTE	Path Start Tile Z (network in front of the lot)

  Commute legs, repeated for each transit switch
    BYTE	Transit Switch 0x4T  (T = Traffic type, see below)
    BYTE	Length of Path (Count of quads)
        TAYSTE    	Path Direction  (0 = West, 1 = North, 2 = East, 3=South)
    TAYSTES	00b  (repeated 0, 1, 2 or 3 times, in order to fill the last BYTE)

Traffic types are in the same order as in the Traffic Simulator:

    0x00 = Walk
    0x01 = Car
    0x02 = Bus
    0x03 = Passenger Train
    0x04 = Freight Truck
    0x05 = Freight Train
    0x06 = Subway
    0x07 = Light Rail
    0x08 = Monorail

A tayste is two bits, one byte contains four taystes. Each tayste takes the path one tile in the direction indicated.

Appendix 7 - Destination Tile

A job located in a neighbouring city has the XZ coordinate of the border crossing.

  • A job located in the western neighbour has an X coordinate of -1 (0xFFFF).
  • A job located in the northern neighbour has a Z coordinate of -1 (0xFFFF).
  • A job located in the eastern neighbour has an X coordinate of 64 (0x0040), 128 (0x0080) or 256 (0x0100).
  • A job located in the southern neighbour has a Z coordinate of 64 (0x0040), 128 (0x0080) or 256 (0x0100).

If the commute path has disappeared (e.g. work demolished or redeveloping), the X coordinate becomes 0xDFA8 (-8,280).

Appendix 8 - Unknown

For residential lots, this value is often 2, but values of 9 and 11 have also been observed. This value is always 16 for industrial lots. If the commute path has disappeared (e.g. work demolished or redeveloping), this DWORD becomes 0x0012FC70.

Savegame Properties (SGProps)

Known entries for SGPROP for the Lot Subfile are listed below.

0x2A4F9C74 - Unknown
Type: UInt32
Rep Count = 1 (usually, but 6 has been seen for the passenger rail station)
0x4A611773 - Unknown
Type: UInt8 (Type 01)
Rep Count = 0
0x691C863C - Unknown
Type: UInt32
Rep Count = 0
0x8999B10B - Unknown
Type: UInt32
Rep Count = 0
0x8999B20B - Unknown
Type: UInt32
Rep Count = 0
0x8A0B4100 - Job/Freight Capacity and Usage (for C, I and Civics)
Type: UInt16 (Type 02)
Rep Count = 12
Rep 1 = Integer Value of Total § Capacity
Rep 2 = Integer Value of Total §§ Capacity
Rep 3 = Integer Value of Total §§§ Capacity
Rep 4 = Freight Capacity (only for ports)
Rep 5 = Some § Job Count
Rep 6 = Some §§ Job Count
Rep 7 = Some §§§ Job Count
Rep 8 = Some Freight Usage (only for ports)
Rep 9 = Actual § Job Count
Rep 10 = Actual §§ Job Count
Rep 11 = Actual §§§ Job Count
Rep 12 = Actual Freight Usage (only for ports)
0xC999C45E - Unknown
Type: UInt32
Rep Count = 0
0xC999E206 - Unknown
Type: UInt32
Rep Count = 0
0xE999B11F - Unknown
Type: UInt32
Rep Count = 0
0xEA54D283 - Budget Item: Department
Type: UInt32
Rep Count = 1 (0xC921CEEB = Mass Transit)
0xEA54D284 - Budget Item: Line
Type: UInt32
Rep Count = 1 (0x00000001)
0xEA54D285 - Budget Item: Purpose
Type: UInt32
Rep Count = 1 (0xCA550301 = Mass Transit Switch)
0xEA54D286 - Budget Item: Cost
Type: SInt64
Rep Count = 1 (0x000000000000000A = 10 § per month)


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