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Posted on behalf of a user:

I was wondering if there is any documentation on how to interpret the variables within the new Lidar_Surface_Detection VGroup. In particular, I cannot find any information on decoding the Surface_Detection_Flag and I was curious which provide information on surface types.

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  1. Subject Expert Answer:

    The table below describes the bit fields for the Surface_Detection_Flag:


    Bit

    Interpretation

    1

    surface detected (0 = no, 1 = yes)

    2, 3

    surface located type (0 = derivative test; 1 = threshold test; 2 = multi-shot averaged data test)

    4, 5, 6

    is saturated; 532 parallel, 532 perpendicular and 1064, respectively

    7, 8, 9

    has negative signal anomaly; 532 parallel, 532 perpendicular and 1064, respectively

    10

    Failure: Z(min gradient) < Z(max gradient)

    11

    Failure: vertical extent exceeds limit

    12

    Failure: peak signal below threshold

    13

    Failure: vertical separation between 532 and 1064 surface top altitudes exceeds allowable limit

    14

    Failure: surface detected at 1064 nm only, but overlying color ratio below threshold

    15, 16

    unused/reserved for future use