Importing a Geolocated Terrain

You can import a terrain that is already geolocated or import a terrain and add geolocation information afterwards.

This task shows you how to:

Before you begin: Make sure a terrain object has been created as a 3D part. See Create a Terrain Object.
See Also
Using B.I. Essentials in Terrain Preparation

Import a Geolocated Terrain File in a Geolocated 3D Part

You can import a terrain file in a geolocated 3D part. A geolocated 3D part is assigned a geolocation extension determined by a CRS, an activation status and a position.

  1. In the top bar, select Add > Import in the list.
  2. Select Terrain File.
    The Import dialog box appears.
  3. Select a geolocated import format, for example stl.

    Note that for Srtm, the Import with geolocation check box is selected by default.

  4. Click Geolocation tab.
  5. Select the Import with geolocation check box.

    The check box is selected if the format is geolocated.

    You can now edit the source CRS as well as the point to re-center the cloud.
    Important: A single CRS is used in a product structure. The CRS can be managed by Data Setup.
  6. Make the required changes in the:
    • Source area to modify the detected and proposed CRS.
    • Target area to modify the origin point information (X, Y, Z values) to recenter the cloud of points.
    The Part area contains the target 3D part information for the terrain file. As the 3D part is already geolocated, the position boxes reflect the values of the geolocation extension. You can modify them by clicking Transfer but note that such a change will modify the extension. The cloud will be re-centered at the point given by the extension.
  7. Select the file you want to import.
  8. Click Apply in the Import dialog box.
  9. Click OK.
    The terrain file is imported.

Import a Geolocated Terrain File in a Non-Geolocated 3D Part

You can import a terrain file with no geolocation information in a 3D part and add geolocation information afterwards. Although not intrinsically geolocated, a terrain file can contain coordinates that refer to a coordinate reference system.

  1. In the top bar, select Add > Import in the list.
  2. Select Terrain File.
    The Import dialog box appears.
  3. In the Geolocation tab, click the Import with geolocation check box.
    You can now edit both the source and target CRS of the terrain file as well as the point to re-center the cloud.
  4. Modify the terrain file information:
    • Source CRS and or
    • Target CRS and the origin point information.

    Important: The source CRS can be compound, but planar units and elevation units have to be the same.

  5. Add geolocation information to the 3D part either:
    • Click Transfer (the geolocation information in the Target area is applied to the 3D part to define its geolocation), or
    • Click Geolocate Part button .
    Geolocating the 3D part adds a geolocation extension to the 3D part. To tune geolocation for its ancestors, use the geolocation B.I. with this position and the target (destination) CRS.