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Map format as of 1.10.2

NBT

In side a world/data/map_xxx.dat file:

0a      0000
# The root tag, a 0x0a compound tag with name length 0000 i.e. no name
        0a      0004    data
                01      0005    scale        00
#               ^ byte
                01      0009    dimension    01
#                                            ^ The End dimension
                02      0006    height       0080
#               ^ short                      ^ 128
                02      0005    width        0080
                03      0007    xCenter      05f5e100
#               ^ int                        ^ 1e8
                03      0007    zCenter      05f5e100
                07      0006    colors       00004000
#               ^ byte array                 ^ byte length: 16384
                ... (tons of bytes representing pixels)
        00
#       ^ End of data compound tag
00
# End of root tag

Each byte C representing a pixel is cacluated from the base color B and variant (0-3) number V. When V is 0, 1, 2, 3, the color RGB is multiplied by 180, 220, 255, 135 respectively then divided by 255 and floor to an integer RGB.

Changes in version 1.12

  • width and height are removed from the tag, and maps must have a fixed 128x128 size
  • Added byte trackingPosition
  • Added byte unlimitedTracking
  • Added byte locked
  • Added list of compounds banners
  • Added list of compounds frames
  • Added byte dimension
  • Added 64 colors for a total of 208 colors

Changes in version 1.16

  • Added 28 colors for a total of 236 colors

Changes in version 1.17

  • dimension is now a namespaced string instead of a byte
  • Added 12 colors for a total of 248 colors