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uniDEM Convert Lidar

uniDEM can convert lidar points and metadata into elevation models (DEM) or images.

Points To DEM

Lidar point elevation or metadata can be gridded into a Digital Elevation Model (DEM).
The following parameters are used to create the DEM:
  1. Select Source - select from loaded lidar data or read and translate directly from storage
    • A loaded point cloud
      • Select DataSet → Select the dataset that may contain one or more LIDAR files
      • Select Data → Select one or more LIDAR files from the Dataset
    • A single point cloud file
    • All point cloud files within a folder
  2. Select source for projection and extents
    • Define manually - define the projection, pixel spacing and DEM extents in a dialog
    • Copy from an existing dataset - use the spacing and extents of another loaded dataset
  3. Select data for Z (elevation) value - select from elevation or any loaded lidar metadata such as Intensity
  4. Select algorithm to perform gridding with
    • Average - the average of all values within that pixel
    • Maximum - the highest of all values within the pixel
    • Minium - the lowest of all values within the pixel
    • Count - the number of points that were captured within the pixel
    • Standard deviation - the standard deviation of the point values that were captured within the pixel
  5. Select point classes to use - creates the DEM with only the selected lidar classes
  6. Select point filtering option - filters the lidar points from the DEM creation
    • Use all points - does not filter any points
    • Filter points using metadata - filter out points with certain metadata valus
    • First return only - build the DEM using only the first lidar returned to the sensor for a given beam
    • Last return only - build the DEM using only the last lidar returned to the sensor for a given beam
  7. Locate output file location - enter the name of the output DEM file and where it will be written

Default shortcut: none

Points To Image

Lidar point elevation or metadata can be gridded into a grey scale or color image.
The following parameters are used to create the DEM:
  1. Select Source - select from loaded lidar data or read and translate directly from storage
    • A loaded point cloud
      • Select DataSet → Select the dataset that may contain one or more LIDAR files
      • Select Data → Select one or more LIDAR files from the Dataset
    • A single point cloud file
    • All point cloud files within a folder
  2. Select source for projection and extents
    • Define manually - define the projection, pixel spacing and DEM extents in a dialog
    • Copy from an existing dataset - use the spacing and extents of another loaded dataset
  3. Select data for image value - select from any loaded lidar metadata such as Intensity or the point elevation (Z)
  4. Select color scheme - select the colormap to be applied to the image (refer to Shader Color Scheme)
  5. Select color scale - automatically or manually define the color map range
  6. Select algorithm to perform gridding with
    • Average - the average of all values within that pixel
    • Maximum - the highest of all values within the pixel
    • Minium - the lowest of all values within the pixel
    • Count - the number of points that were captured within the pixel
    • Standard deviation - the standard deviation of the point values that were captured within the pixel
  7. Select point classes to use - creates the DEM with only the selected lidar classes
  8. Select point filtering option - filters the lidar points from the DEM creation
    • Use all points - does not filter any points
    • Filter points using metadata - filter out points with certain metadata valus
    • First return only - build the DEM using only the first lidar returned to the sensor for a given beam
    • Last return only - build the DEM using only the last lidar returned to the sensor for a given beam
  9. Locate output file location - enter the name of the output image file and where it will be written

Default shortcut: none

Crop/Merge Points

Lidar point data cropped into defined regions and or merged from multiple files to one file.
The following parameters are used to create the DEM:
  1. Select Data - select the data files to use in the crop and/or merge
  2. Crop data to - select method to crop to one of the following options:
    • Current drawing - output points will be those within the drawn polygon or rectangle
    • Existing shape - output points will be those within the loaded shape
    • Extents of one dataset - output points will be those within the extents of the selected shape
    • DEM Selection Mask - output points will be those intersecting with any selected pixel in the selection mask for a layer
    • DEM Selection Mask - output points will be those intersecting with any selected pixel in the selection mask for a layer
    • Merge only (no cropping) - the points of the selected files will be merged
  3. Locate output file location - enter the name of the output lidar file (las or laz) and where it will be written

Default shortcut: none