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Use of stereo aerial photography for quantifying changes in the extent and height of mangroves in tropical Australia

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Lucas, Richard M and Ellison, JC and Mitchell, A and Donnelly, B and Finlayson, M and Milne, T (2002) Use of stereo aerial photography for quantifying changes in the extent and height of mangroves in tropical Australia. Wetlands Ecology and Management, 10 (2). pp. 161-175. ISSN 0923-4861

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Abstract

The study investigated the use of aerial photographs, acquired in 1950 and 1991, for assessing the temporal dynamics of mangroves along theWest Alligator River in Australia’s Northern Territory. For both years, mangrove extent was mapped using an unsupervised classification of the digital orthomosaic and Digital ElevationModels (DEMs), or height maps, of the mangrove canopy were derived from stereo pairs. Helicopter and field observations in 1998 and 1999 respectively provided ground truth for interpreting the derived datasets. The comparison of mangrove extent revealed a substantial movement over the 41-year period, perhaps in response to hydrological changes that have resulted in a landward extension of saline conditions. Changes in the height of mangroves were observed but were difficult to quantify due to the reduced quality of the 1950 DEM. The study demonstrated the viability of using time-series of aerial photography for monitoring and understanding the long-term response of mangroves to environmental change, including hydrological variations and sea level rise.

Item Type: Article
Keywords: aerial photography, Australia, Digital Elevation Models, historical change, sea level rise, mangroves
Journal or Publication Title: Wetlands Ecology and Management
Page Range: pp. 161-175
ISSN: 0923-4861
Identification Number - DOI: 10.1023/A:1016547214434
Additional Information: The original publication is available at www.springerlink.com
Date Deposited: 20 Jan 2008 22:57
Last Modified: 18 Nov 2014 03:28
URI: http://eprints.utas.edu.au/id/eprint/3054
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