Title: Quality Assessment of Hydrogeomorphological Features Derived from Digital Terrain Models
Authors: POGGIO LauraSOILLE Pierre
Publisher: OPOCE
Publication Year: 2008
JRC N°: JRC47243
ISSN: 1018-5593
Other Identifiers: EUR 23489 EN
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC47243
Type: EUR - Scientific and Technical Research Reports
Abstract: Digital terrain models (DTM) provide a model for representing the continuous earth elevation surface that can contain errors introduced by the main phases of generation and modelling. Uncertainty of the model is rarely considered by users. Assessment of uncertainty require information on the nature, amount and spatial structure of the errors. DTMs of di®erent original resolution were compared in order to assess the quality of derived hydrological and morphological features. SRTM dataset with resolution of 100m, DEM dataset mosaic from various sources with a resolution of 60m and ASTER derived dataset with a resolution of 30m were used. The error propagation was modelled with a stochastic approach. The probabilistic distribution of extracted hydrological features was drawn considering the spatial structure of errors in the datasets. The features considered were stream network and watershed divides net. The distribution of the Strahler order of the features was studied. An analysis of the overall probability of features extracted from variously prepared datasets was carried in order to get information on where is the most probable stream network or watershed divides net.
JRC Institute:Institute for Environment and Sustainability

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