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Simple and effective monitoring of historic changes in nearshore environments using the free archive of Landsat imagery

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dc.creator Knudby, Anders
dc.creator Newmanb, Candace
dc.creator Shaghude, Yohanna W.
dc.creator Muhando, Christopher A.
dc.date 2016-02-19T07:34:54Z
dc.date 2016-02-19T07:34:54Z
dc.date 2009
dc.date.accessioned 2018-04-18T11:49:47Z
dc.date.available 2018-04-18T11:49:47Z
dc.identifier Knudby, A., Newman, C., Shaghude, Y. and Muhando, C., 2010. Simple and effective monitoring of historic changes in nearshore environments using the free archive of Landsat imagery. International Journal of Applied Earth Observation and Geoinformation, 12, pp.S116-S122.
dc.identifier http://hdl.handle.net/123456789/450
dc.identifier.uri http://hdl.handle.net/123456789/10176
dc.description The recently released archive of Landsat imagery can be used to detect historic changes in nearshore environments. We used a series of free Landsat images spanning the years from 1984 to 2009 to detect changes in the spatial extent of dominant substrate types, coral, algae, and seagrass, around Bawe and Chumbe islands in Zanzibar, and we compared the use of true-colour composites and supervised classifications. Results indicate temporal changes in the spatial extent of seagrass meadows are easily mapped with Landsat imagery, whereas temporal changes in algae cover and particularly coral cover pose greater challenges because of the similarities in spectral reflectance properties between the relevant substrate types. Supervised classification requires substantially more processing than the simple display of true-colour composites, but does not improve interpretation in our study. We suggest that historic Landsat imagery, obtained at no cost and processedminimally with free software, is the best available data source for studies of historic changes in the nearshore environments of East Africa. 2009 Elsevier B.V. All rights reserved
dc.language en
dc.publisher Elsevier
dc.subject Environments
dc.subject Archive of Landsat imagery
dc.subject Monitoring of historic changes
dc.title Simple and effective monitoring of historic changes in nearshore environments using the free archive of Landsat imagery
dc.type Journal Article


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