ACCURACY ANALYSIS OF ESTIMATED CAMERA ORIENTATION PARAMETERS OF HISTORICAL IMAGES – CASE STUDY OF GEORG-SCHUMANN-BAU IN DRESDEN (GERMANY)

An automatic workflow is introduced to measure surface flow velocities in rivers. The provided tool enables the measurement of spatially distributed surface flow velocities independently of the image acquisition perspective. Furthermore, the study illustrates how river discharge in previously ungauged and unmeasured regions can be retrieved, considering the image-based flow velocities and digital elevation models of the studied river reach reconstructed with UAV photogrammetry.