Chandler, J.H. and Lane, S.N. and Richards, K.S. (1996)
The determination of water surface morphology at river channel confluences using automated digital photogrammetry and their consequent use in numerical flow modelling
- Cite key
- International Archives of Photogrammetry and Remote Sensing
- This paper describes the development and application of automated digital photogrammetry to derive the 3D coordinates of a dynamic and turbulent water surface of an actively braiding pro-glacial stream in the Swiss Alps. A net of surface marker target was constructed using cheap polystyrene balls constrained by a series of fine lines. Stereo imagery was acquired using a pair of synchronised semi-metric Hasselblad cameras and scanned at a resolution of 20 microns. Image coordinates were measured automatically using Visilog, a general image processing package, transformed into photo-cooordinates and sorted automatically using the collinearity condition. Final object coordinates were derived using a self-calibrating bundle adjustement, elevations corrected for combined spherical offset and buoyancy. These surface morphological data are being used to assist the development of a 3D computerised flow model.