These very high resolution geospatial data make it possible to produce precise and complete information on the height of the forest canopy, the slope of the terrain and the presence of paths and watercourses. These data can now be used to create river maps with unmatched precision and accuracy. However, the existing methods, developed to process aerial photos, are no longer suitable for data volumes of several hundred terabytes and require numerous manual interventions. As part of this project, the researchers propose an innovative approach to automate the process and guarantee an improved end result.
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More specifically, this approach is based on (1) terrain modeling carried out by triangulation based on the lidar points on the ground directly making tile-mapping and interpolation unnecessary and (2) modeling of watercourses from thalwegs to avoid pre-treatment in the field and manual waterway connections.
To implement their approach, the research team set the following two objectives: