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LAS 1.2 has a classification byte, which is 8 bits. However 3 of those bits are used for the flags (withheld, synthetic, and keypoint). With laspy, classification accesses the 5 bits that LAS 1.2 allows for the classification number. 2^5 is 32, meaning you can store 32 classes (0-31) in that 5-bit integer. It doesn't touch the flag bits. ...

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