Gemini Terreng: Georeference PDF or image

Gemini Terreng: Georeference PDF or image

To start the process, you will need the following:

a) A raster file in formats such as .jpg, .jpeg, .tif, or .tiff, or a PDF file. If you are attempting to georeference a PDF file, please use Adobe Acrobat or another software that allows you to convert the PDF to a raster format such as .tif, .tiff, .jpg, or .jpeg. Otherwise, we recommend using this link: Link to Adobe PDF to Image Conversion

b) Reference points – a reference file in a global coordinate system (e.g., NTM5, UTM32) to obtain the positional information. This could be, for example, a DWG file with a map or points representing the corners of a building.

c) The most crucial requirement is that the objects in both the PDF/raster file and the reference file have common visible points.

  1. Create a project in Gemini Terrain and select the desired project coordinate system
  2. Create a new APPLAG (.gmi file) in Gemini called ‘Reference Points in Global System,’ which consists of a reference map or points in the project coordinate system (in our case, UTM 32).
  3. Import the reference file with points or .DWG
  4. The reference file consists of points, each of which has a unique S_OBJID code. If they are not established you need to create them in Gemini. They will have the global coordinates. We will come back to the  S_OBJID code later in the tutorial.
  5. Create a new empty APPLAG (.gmi file) in Gemini and name it ‘Local Points.
  6. Create a new APPLAG in Gemini (Bgr-fil).
  7. Follow these steps to select either the converted PDF file (in raster formats .jpg, .jpeg, .tif, .tiff) or the raster file directly, then click OK.
  8. Zoom in to point 0,0,0 to view the raster file in the window. If it’s difficult to see, it means you are far from the origin. Create a line starting from the origin at North 0, East 0, Height 0, with a length of 1000m. This line will help you identify where the raster is located on the canvas.
  9. Now, we are going to insert points into the ‘Local points’ layer that correspond to the points used in the ‘Reference points in the global system,’ specifically those with the S_OBJID code.
  10. Repeat this process at least 3 times, so you will need a minimum of 3 common points.
  11. The georeferencing is almost ready; now, proceed with the final step:
  12. The pop-up window displays the newly generated georeferenced location of the TIFF file. Click ‘NO’:
  13. Proceed to the provided path on your PC and import the TIFF file to Novorender :) Great job!
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