| 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 |
2018-04-18T11:12:26Z |
|
| dc.date.available |
2018-04-18T11:12:26Z |
|
| 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/123456789/9217 |
|
| 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 |
|