Specifying DEM settings

To specify the digital elevation model settings:

  1. From the Available Layers list, select the layer that contains the digital elevation model.
  2. Set the Background value: the value that indicates which pixels are to be handled as No Data.

    If this value is not specified through the parameter or found in the metadata, all pixels of the DEM are assumed to be valid.

  3. Specify the Elevation scale: the elevation scale used by the DEM.

    If this value is not specified through the parameter or found in the metadata, its value defaults to 1.0, indicating that the scale is 1:1.

  4. Specify the Elevation offset: the elevation offset used by the DEM.

    If this value is not specified through the parameter or found in the metadata, the offset defaults to 0.0, indicating that there is no offset.

  5. Specify the Elevation units: the units used to describe the elevation values of the input DEM file.

    If this value is not specified through the parameter or found in the metadata, its value defaults to METER.

    Available units are:
    • METER
    • FEET
  6. Specify the Elevation reference: the vertical reference for the elevation values.

    If this value is not specified through the parameter or found in the metadata, it is assumed to be MSL.

    Available options are:
    • Mean Sea Level: elevations are referenced to Mean Sea Level
    • Ellipsoidal: elevations are referenced to the ellipsoid
  7. Click DEM Info to verify if the DEM has negative values or NoData values defined through the metadata.
  8. Click OK to close the DEM File window.
Parent topic: The ATCOR Ground Reflectance workflow
Previous topic: Specifying elevation and illumination conditions
Next topic: Specifying visibility and ground reflectance

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