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Earth Science | Biosphere | Vegetation | Vegetation Cover
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The mangroves of Torres Strait were mapped with classified Landsat TM satellite imagery. There was 15,663 ha of mangrove mapped on the islands and reefs of central Torres Strait. The largest area of mangrove, 4,744, 3,209, 1,484 and 1,142 ha were mapped on the islands of Boigi, Saibai, Moa and Turnagain Island respectively, which accounted for over two-thirds, 68%, of the mangroves of the central Torres Strait study area. Approximately one-third (49) of the 174 islands of central Torres Strait had mangroves. There was a significant correlation between the distribution of mangroves and the underlying geology; most of the mangroves in Torres Strait were located on coastal alluvium landform features. The mangrove basemaps have been entered into the Torres Strait Geographic Information System for future research, monitoring and conservation planning. Refer to the report: Long BG and McLeod I. (1997) Distribution of Mangroves in Torres Strait. CSIRO Marine Research. Cleveland, Australia. 17 pp.
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Normalised Difference Vegetation Index (NDVI) images from Feb. 1991 have been compiled by processing and compositing AVHRR data from the Alice Springs receiving station to a nominal 1km resolution. The NDVI equation produces values in the range of -1.0 to 1.0, where increasing positive values indicate increasing green vegetation and negative values indicate nonvegetated surface features such as water, barren land, ice, and snow or clouds. Each image is compiled from AVHRR data collected over a fortnight.