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1 1.10 Application of estuarine and coastal classifications in marine ...

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ground resolution <strong>of</strong> 30 m. Each classified pixel <strong>in</strong> the source l<strong>and</strong> <strong>and</strong> water data sets were<br />

compared on a pixel-by-pixel basis to identify the spatial trend <strong>in</strong> the changes. A change pixel<br />

was classified as: (1) l<strong>and</strong> to l<strong>and</strong> = no change, (2) water to water = no change, (3) l<strong>and</strong> to water<br />

= change (loss), or (4) water to l<strong>and</strong> = change (ga<strong>in</strong>) (Barras et al. 2003). The f<strong>in</strong>al classification<br />

showed a net loss <strong>of</strong> wetl<strong>and</strong> <strong>and</strong> significant shorel<strong>in</strong>e erosion between 1990 <strong>and</strong> 2000. Figure 18<br />

shows that the Gulf <strong>of</strong> Mexico shorel<strong>in</strong>e experienced significant loss (150 to 200 m) south <strong>of</strong><br />

Rockefeller Wildlife Refuge due to erosion, but some ga<strong>in</strong>s were detected west <strong>of</strong> Freshwater<br />

Bayou. Analysis <strong>of</strong> a L<strong>and</strong>sat TM scene acquired on October 16, 2002, after the central<br />

Louisiana coast was struck by Hurricane Lili on October 3, 2002, revealed creation <strong>of</strong> over 256.6<br />

ha <strong>of</strong> new ponds <strong>in</strong> a formerly dense healthy marsh that had shown no significant loss s<strong>in</strong>ce the<br />

late 1970s (Barras et al. 2003).<br />

<strong>1.10</strong>.7.4 Mangrove Change Detection <strong>in</strong> Southeast Asia<br />

Mangrove forests are a unique tropical <strong>and</strong> subtropical plant community grow<strong>in</strong>g at the<br />

<strong>in</strong>terface between l<strong>and</strong> <strong>and</strong> sea. Mangrove forests <strong>and</strong> their associated ecosystems are an<br />

important natural resource for people (Barbier et al. 2008) <strong>and</strong> provide critical habitat for a wide<br />

diversity <strong>of</strong> organisms both above <strong>and</strong> below the water (Nagelkerken et al. 2008). The wide<br />

range <strong>of</strong> goods <strong>and</strong> services provided by mangrove forests has been valued at USD 200,000-<br />

900,000 ha -1 annually (Wells et al. 2006). Nevertheless, <strong>in</strong> the two decades between 1980 <strong>and</strong><br />

2000 an estimated 35% <strong>of</strong> the world’s mangroves were lost due to human <strong>and</strong> non-human<br />

processes. The rates <strong>of</strong> loss cont<strong>in</strong>ue to rise more rapidly <strong>in</strong> develop<strong>in</strong>g countries, where the<br />

majority (>90%) <strong>of</strong> the world’s mangroves are located (Duke et al. 2007). The primary causes<br />

47

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