DBPapers
DOI: 10.5593/sgem2010.05.11.S1.926

THE DEVELOPMENT OF GEOINFORMATICS BASED FRAMEWORK TO QUANTIFY GULLY EROSION

AUTHOR/S: F. SATTAR, R.J.WASSON, D. PEARSON, G. BOGGS, W. AHMAD, M. NAWAZ
Sunday 1 August 2010 by Libadmin2010

10th International Multidisciplinary Scientific GeoConference - SGEM2010, www.sgem.org, SGEM2010 Conference Proceedings/ ISBN 10: 954-91818-1-2, June 20-26, 2010, Vol. 1, 1159-1166 pp

ABSTRACT

In this study a methodological framework is presented using tools and techniques of
geoinformatics to quantify gully erosion. The study was conducted in the Fergusson
catchment; a sub-catchment of the Daly river, Northern Australia. Various airborne and
field based reconnaissance surveys have shown that the catchment in places is severely
affected by gully erosion producing large amounts of sediment.

The framework applied comprised of Cartosat-1 (2.5 m resolution) stereo imagery 2008,
topographic maps 1:20,000, 1 Second ( 30m) SRTM level 2 DEM, Stereo Aerial
Photos of 1948 at the scale of 1:30,000 and Differential GPS data points. Oriented
images were produced using Image Analysis software and a Digital Surface Model was
generated. Stereo Analyst for ArcGIS software was used for three dimensional
visualization of the earth surface and identification and mapping of gullies. Stereo
Aerial Photos of 1948 were orthorectified and three dimensional views were generated
for each pair of photographs and a map of gullies in1948 was created. GIS based
analysis was performed to measure the volumetric changes of gully erosion between
2008 imagery and 1948 aerial photographs. A spatial database was developed
incorporating the gully morphological and soil loss information. This study will
contribute to the construction of a sediment budget of the Daly River catchment.

Keywords: Cartosat-1 Imagery, Digital Surface Model, Gully Erosion, Three Dimensional Visualization. Sediment Budget

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