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Texture-based classification of sub-Antarctic vegetation communities on Heard Island.

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Murray, H and Lucieer, A and Williams, R (2010) Texture-based classification of sub-Antarctic vegetation communities on Heard Island. International Journal of Applied Earth Observation and Geoinformation, 12 (3). pp. 138-149. ISSN 1569-8432

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Abstract

This study was the first to use high-resolution IKONOS imagery to classify vegetation communities on sub-Antarctic Heard Island. We focused on the use of texture measures, in addition to standard multispectral information, to improve the classification of sub-Antarctic vegetation communities. Heard Island’s pristine and rapidly changing environment makes it a relevant and exciting location to study the regional effects of climate change. This study uses IKONOS imagery to provide automated, up-to-date, and non-invasive means to map vegetation as an important indicator for environmental change. Three classification techniques were compared:multispectral classification, texture based classification, and a combination of both. Texture features were calculated using the Grey Level Co-occurrence Matrix (GLCM). We investigated the effect of the texture window size on classification accuracy. The combined approach produced a higher accuracy than using multispectral bands alone. It was also found that the selection of GLCM texture features is critical. The highest accuracy (85%) was produced using all original spectral bands and three uncorrelated texture features. Incorporating texture improved classification accuracy by 6%.

Item Type: Article
Keywords: Vegetation mapping Multispectral classification Grey level co-occurrence matrix (GLCM) Texture-based classification Sub-Antarctic Heard Island IKONOS imagery
Journal or Publication Title: International Journal of Applied Earth Observation and Geoinformation
Page Range: pp. 138-149
ISSN: 1569-8432
Identification Number - DOI: 10.1016/j.jag.2010.01.006
Additional Information: The definitive version is available at http://www.sciencedirect.com
Date Deposited: 14 Jul 2010 02:32
Last Modified: 18 Nov 2014 04:11
URI: http://eprints.utas.edu.au/id/eprint/9907
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