[GIS] Extract DEM and DTM information from LIDAR image using E-Cognition

demdigital image processingecognitionlidarlidar-analyst

I´m trying to extract DEM and DTM from a LIDAR file. Currently, I rasterize the image but don´t know which algorithm I need to apply to obtain the DEM and DTM information in different models to be able to compare both of them.

Best Answer

I've recently completed this same analysis, just in ArcMap 10.1-10.3; you won't need eCognition, although it can create segmented object-based DSM/DTM.

  1. add the .LAS file to an LASD dataset in arc catalog
  2. convert to raster using the LAS toolset mentioned by Cameron above
  3. using the raster calculator tool (LAS elevation) - (DEM), which should be your DSM/DTM.

Next you can reclassiffy these accordingly, including masking out other unwanted noise (e.g. set a threshold for the heights you're looking for)

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