Calculating the focal length

This tool is not directly related to GNSS data processing, but it helps to calculate the focal length of the camera, which is necessary for data processing in photogrammetric programs.
Instructions for calculating the focal length:

1. Click the Tools tab and select Focal Length Calculation.

2. In the opened window specify the following parameters: flight altitude of your aircraft, previously obtained focal distance in millimeters (from the result of aerotriangulation in photogrammetric software) and error values by height of your control points.

3. Click the "Calculate" button. The program will calculate average height error and focal length, which can be used in photogrammetric programs.

4. If necessary, the new focal length can be written to the EXIF tags of your photos by clicking the "Write to Tags" button. This will help in further photogrammetric data processing.

5. Specify the folder with the photos.

6. The program will write the new focal length to all photos in the specified folder.

The program replaces the focal length in the original files without creating copies of the photos.