Tilemap decoding thing

so you know how images are “decoded” (ig, thats probably what its called)

img`
. . . . . 
. 3 . 3 . 
. . . . . 
3 . . . 3 
. 3 3 3 . 
`

how are tilemaps decoded? i’m trying to make a gms2 to makecode arcade tilemap importing thing so this would really help

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