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NDSM

  • 1.  NDSM

    Posted 04-10-2020 12:57

    hello everyone

    please,can I nDSM generation from lidar (point cloud) without georeferencing?

    thanks



  • 2.  Re: NDSM

    Posted 04-23-2020 23:27

    Hello,

     

    Yes, I think so:

    (1) load the point cloud into Trimble eCognition software

    (2) convert point cloud into raster layer (using lowest points) 

    (3) classify Trees and Buildings (elevated objects) in the raster file

    (4) interpolate the elevation inside the elevated object boundaries (creates a DTM layer)

    (5) convert point cloud into raster layer (using highest points, creates a DSM layer) 

    (6) subtract the DTM from the DSM layer to generate the nDSM (using the layer arithmetics rule)

    (7) export the nDSM raster layer

     

    But, if your input data has no coordinate information, the output would have no georeference information. The workflow above is independent if your data is georeferenced or not.

     

    Regards,

    Christian



  • 3.  Re: NDSM

    Posted 04-24-2020 09:08

    Thank you very much to answer.

    Please,number (2 and 5) how get it?

    Or video illustrate it.

    God bless you

     

    في الجمعة، 24 أبريل 2020 في 9:27 ص تمت كتابة ما يلي بواسطة

    christian_weise@trimble.com <trimble@jiveon.com>:

     

    Trimble <https://community.trimble.com/?et=watches.email.thread>

    Re: NDSM

     

    reply from Christian Weise

    <@Christian Weise//community.trimble.com/people/christian_weise@trimble.com?et=watches.email.thread>

    in Mapping and GIS Solutions Community - View the full discussion

    <https://community.trimble.com/message/28141-re-ndsm?commentID=28141&et=watches.email.thread#comment-28141>

     



  • 4.  Re: NDSM

    Posted 04-26-2020 23:49

    Please check out this video from our YouTube Channel: 

    https://www.youtube.com/watch?v=Sw8IJ8myvMI&list=PL3E9iXC9uqkxtf47I1aLEH3pZIKf9BJbY&index=9&t=0s

     

    eCognition tv - YouTube offer several channels and one of them (eCognition Deconstructed) is a monthly video series that features a specific algorithm - In 10 to 15 minutes, we breakdown the functionality and provide theoretical explanations and real-world. The first link refers to the "rasterize point cloud" algorithm.

     

    The YouTube channel offers also access to eCognition webinars. We have 3 different categories of webinars.
    - Starting Point [Discover new products or versions] GREEN icon
    - Elevate your Skills [hear how others use eCognition] ORANGE icon
    - Power Hour [Advanced workflows & demos] BLUE icon

     

    Regards,

    Christian