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Type: Conference paper
Title: An Image-Based Diversity Index For Assessing Land Degradation in an Arid Environment in South Australia
Author: Jafari, R.
Lewis, M.
Ostendorf, B.
Citation: The 13th Australasian Remote Sensing and Photogrammetry Conference (20-24 November, 2006, Canberra)
Publisher: ARSPC
Publisher Place: Canberra, Australia
Issue Date: 2006
Conference Name: The Australasian Remote Sensing and Photogrammetry Conference (20 Nov 2007 : Canberra, Australia)
Abstract: One of the major indirect effects of artificial watering points in a grazed landscape is the development around them of a zone of extreme degradation called a piosphere. To investigate the degradation status of such zone in an arid environment in South Australia, the Moving Standard Deviation Index (MSDI) was applied to Landsat TM band 3 data. We found that watering points had significantly higher MSDI values (p <0.001) than reference areas (non-degraded areas. The results of two vegetation indices, the Normalized Difference Vegetation Index (NDVI) and Perpendicular Distances vegetation index (PD54), which were used as reference indices showed that The PD54 was more appropriate than NDVI in this arid environment. Piospheres were found to be more heterogeneous (high MSDI values) than non-degraded areas and heterogeneity decreased by increasing distance from water points. This study confirms that MSDI can be used as an appropriate adjunct to PD54 for land degradation assessment in arid rangelands of South Australia, which are naturally heterogeneous.
RMID: 0020072677
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Appears in Collections:Soil and Land Systems publications
Environment Institute publications

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