TRaCK: Tropical Rivers and Coastal Knowledge

Science and knowledge that governments, communities, industries for sustainable use of Australia's tropical rivers and estuaries

Flood inundation mapping of tropical river catchments in Northern Australia using optical and ALOS-PALSAR data

TitleFlood inundation mapping of tropical river catchments in Northern Australia using optical and ALOS-PALSAR data
Publication TypeConference Paper
Year of Publication2010
AuthorsBartolo, R, Ward, DP, Jones, D
Conference Name15 Australasian Remote Sensing and Photogrammetry Conference, 13-17 September 2010
Date Published09/2010
Conference LocationAlice Springs, Northern Territory, Australia
Keywords4: Material Budgets
Abstract

Defining the extent of wet season inundation in floodplain and riverine environments is an important component of the annual catchment surface and groundwater budgeting process. This paper reports on a project to map the flood inundation extent of the Daly River (Northern Territory) catchment and was undertaken as part of a larger flood mapping project for Theme 4 (catchment water budgets and water resource assessment) through the Tropical Rivers and Coastal Knowledge (TRaCK) program. Determining the extent of flooding in tropical catchments using remote sensing is dependent on a number of factors: local conditions at the time of image acquisition (e.g.: cloud cover and flooding under vegetation); sensor selection (e.g.: optical and SAR); and definition of flood extent (interannual and Intrannual analysis).
Using historic rainfall data for the Daly catchment, 2009 was identified as a suitable year for the mapping of a wet year maximum inundation extent. Optical remote sensing Imagery (Landsat 5 TM) were captured during the 2009 wet season, coincident with ALOS PALSAR ScanSAR scenes. Classification of extent of flooding for a single flood event (March 7-8, 2009) was conducted using Geographic Object Based Image Analysis (GEOBIA) approaches. Whereby the use of both optical and SAR data reduced the potential for confusion between the vegetation types and enabled issues of cloud to be addressed in the optical image.
The results from this project will be used in a number of TRaCK projects: Theme 4 (catchment water budgets and water resource assessment): Theme 5 (food webs and biodiversity) as part of the assessment process for defining the biodiversity and biomass components of floodplain and riverine ecosystems and Theme 1 (scenario evaluation).

URLhttp://www.scribd.com/doc/37461127/15arspc-Submission-210