Replace LiDAR area

Nicky
Nicky
in Elevation Data

Hello everyone,

I have a LiDAR file from 2018 that covers a large area (ski resort).

New spot surveys have been carried out with the drone and I would like to update my topo file in Global Mapper.

However, I do not know what process or command to use to "replace" the old point cloud with the new one only in the area updated?

Does anyone have any ideas?

Thanks in advance,

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  • bmg_mike
    bmg_mike Global Mapper Guru Moderator, Trusted User

    What you could do is load the new point cloud and create a coverage polygon from it (right-click under Layer menu in Control Center), then use the coverage polygon to select and delete points from the old point cloud so there is no overlap.

    Mike

    Global Mapper Guru

  • Nicky
    Nicky

    Hi Mike,

    Thanks for your answer.

    I thought about it and did it but the coverage polygon is too wide and creates empty areas (because the coverage of the recent drone survey has holes, especially on the edges..)

    So I would have to create a smaller buffer zone inside, delete the points that are too far out, delete the interior points on the old topo and then import the new ones...

    I was just wondering if there was a more efficient solution with less risk of error and less manipulation...

  • bmg_mike
    bmg_mike Global Mapper Guru Moderator, Trusted User

    Hi Nicky,

    If your end goal is to just get an updated terrain vs having a blended Lidar data set, then what you could do is:

    • separately grid each Lidar data set. Use a small gap filling value for the drone survey
    • enable feather blending for the drone survey-derived grid to smooth the transition into the underlying lower-resolution grid.

    Mike

    Global Mapper Guru

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