Accounting for uncertainty in DEMs from repeat topographic surveys : improved sediment budgets

Auteur(s) et Affiliation(s)

WHEATON, J.M.

Dep. of Watershed Sciences, Utah Sate Univ., Logan, Etats-Unis

BRASINGTON, J.

Inst. of Geography and Earth Sciences, Univ. of Wales, Aberystwyth, Royaume-Uni

DARBY, S.E.

School of Geography, Univ., Southampton, Royaume-Uni

SEAR, D.A.

School of Geography, Univ., Southampton, Royaume-Uni

Description :
The aim of this paper is to present a new technique that allows more robust estimation of DEM quality and its influence on sediment budgets derived from DEM differencing. The novel contributions set out here are : 1) a new technique for estimating the magnitude of DEM uncertainty in a spatially variable way using fuzzy set theory; and 2) a technique for discriminating DEM of Difference DoD uncertainty on the basis of the spatial coherence of erosion and deposition units using Bayes Theorem. The application of these new techniques is illustrated with 5 yeats of high resolution data (GPS surveys) from a braided reach of the River Feshie in the Highlands of Scotland.

Type de document :
Article de périodique

Source :
Earth surface processes and landforms, issn : 0197-9337, 2010, vol. 35, n°. 2, p. 136-156, nombre de pages : 21, Références bibliographiques : 1,5 p.

Date :
2010

Editeur :
Pays édition : Royaume-Uni, Chichester, Wiley

Langue :
Anglais