Very-high-resolution mapping of river-immersed topography by remote sensing

Auteur(s) et Affiliation(s)



Description :
The remote sensing techniques used for river bathymetry are reviewed. They can be divided into 2 types : active remote sensing, such as ground penetrating radar and bathymetric lidar; or passive remote sensing, such as through-water photogrammetry and radiometric models. This last technique, which consists of finding a logarithmic relationship between river depth and image values, appears to be the most used, lidar is an emerging technique. For each depth measurement method, the AA. detail the physical principles and then a review of the results obtained in the field. This review shows a lack of data for very shallow rivers, where a very high spatial resolution is needed. Hence the AA. propose an application of 2 techniques, radiometric models and through-water photogrammetry, with very-high-resolution passive optical imagery, light platforms, and off-the-shelf cameras. They show that, in the case of the radiometric models, measurement is possible with a spatial filtering of about 1 m and a homogeneous river bottom. In contrast, with through-water photogrammetry, fine ground resolution and bottom textures are necessary.


Type de document :
Article de périodique

Source :
Progress in physical geography, issn : 0309-1333, 2008, vol. 32, n°. 4, p. 403-419, nombre de pages : 17, Références bibliographiques : 3 p.

Date :
2008

Editeur :
Pays édition : Royaume-Uni, London, Sage Publications