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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, Ellison, JC, Mitchell, A, Donnelly, B, 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, vol. 10, no. 2 , pp. 161-175 , doi: 10.1023/A:1016547214434.

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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
Authors/Creators:Lucas, Richard M and Ellison, JC and Mitchell, A and Donnelly, B and Finlayson, M and Milne, T
Keywords: aerial photography, Australia, Digital Elevation Models, historical change, sea level rise, mangroves
Journal or Publication Title: Wetlands Ecology and Management
ISSN: 0923-4861
DOI / ID Number: 10.1023/A:1016547214434
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