Nature research paper: Historical glacier change on Svalbard predicts doubling of mass loss by 2100
To improve feature selection during the SfM reconstruction, we enhance the digitized images by increasing contrast through histogram stretching and sharpening features using the Dehaze Tool in Adobe Lightroom. This radiometric enhancement step improves photogrammetric reconstructions over ice and snow, which tend to be lower contrast than the surrounding land.
Next, inside the target regions, we convolve the image with a Laplacian of Gaussian filter to locate the fiducial spot. We process the aerial photographs in a standard photogrammetric workflow in Agisoft Metashape 1.6.0. In brief, we first extract up to 40,000 keypoints from each image. Keypoint matching across all the images provides the constraints to solve for the unknown parameters, including the relative camera locations/orientations and the camera distortion parameters.
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