Remote survey of large-scale braided, gravel-bed rivers using digital photogrammetry and image analysis

Details

Serval ID
serval:BIB_AD0D828A421A
Type
Article: article from journal or magazin.
Collection
Publications
Title
Remote survey of large-scale braided, gravel-bed rivers using digital photogrammetry and image analysis
Journal
INTERNATIONAL JOURNAL OF REMOTE SENSING
Author(s)
Westaway RM, Lane SN, Hicks DM
ISSN
0143-1161
Publication state
Published
Issued date
02/2003
Volume
24
Number
4
Pages
795-815
Notes
ISI:000181422100013
Abstract
The use of conventional survey methods to monitor large, gravel river
beds has traditionally led to a reliance on repeat measurements of
cross-sections which, unless very closely spaced, may give unreliable
information about three-dimensional channel morphology and
morphological change. Provided certain technological limitations can be
overcome, remote survey techniques, such as digital photogrammetry and
airborne laser scanning, remove the spatial and temporal constraints
typically associated with ground-based surveys, allowing high spatial
resolution, distributed, elevation mapping of gravel river beds. This
paper develops the use of digital photogrammetry for the survey of a
3.3 km reach of the braided Waimakariri River, New Zealand, which, when
combined with image analysis of water colour to infer water depth,
provides a Digital Elevation Model (DEM) of the entire river bed.
Central to the successful application of this method is DEM
post-processing. Errors take two forms: (i) individual point errors
associated with incorrect stereo-matching during automated data
collection; and (ii) spatially-variable systematic errors that are
associated with uncertainties in sensor position and orientation as
determined during the bundle adjustment. An automated post-processing
procedure is developed to deal with individual point errors and this
improves DEM surface quality in terms of accuracy, precision and
internal reliability. Systematic errors in the final DEM surface were
reduced by applying a simple correction based on surveyed photo-control
point elevations.
Web of science
Create date
03/02/2011 14:40
Last modification date
20/08/2019 15:17
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