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

Inproceedings
Cite key
Chandler1996
Language
en
Journal
International Archives of Photogrammetry and Remote Sensing
Volume
XXXI
Number
B7
Pages
99-104
URL
http://www.isprs.org/proceedings/XXXI/congress/part7/99_XXXI-part7.pdf
Description
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.