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External Models

Gemini Terrain has three external model types that can be inserted into a drawing:

  • IFC models
  • DWG models
  • PDF models

Georeferencing External Models

The program supports georeferencing of external models using a Helmert transformation based on two points. This method makes it possible to correctly place the model in a geographic coordinate system by using two known reference points.

You insert models into the drawing with the following option on the context menu:

  • Georeference Model...

Procedure

  1. Insert the file into the drawing.
  2. Select the georeferencing function.
  3. Select two reference points in the model.
  4. Select corresponding points in the map.
  5. The Helmert transformation is performed.

The program calculates displacement, rotation, and scaling based on the two points. Georeferencing ensures that the model can be correctly placed in a global coordinate system.

Georeferencing IFC Models

For IFC models, you can choose to export a new IFC file after georeferencing. This writes the georeferencing to the file without changing the geometry, but be aware that this information may not necessarily be interpreted in other programs.