Status and distribution of mangrove forest of the world using earth observation satellite data

Giri, C., Ochieng, E., Tieszen, L. L., Zhu, Z., Singh, A., Loveland, T. and Duke, N. (2011) Status and distribution of mangrove forest of the world using earth observation satellite data. Global Ecology and Biogeography, 20 1: 154-159. doi:10.1111/j.1466-8238.2010.00584.x

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Author Giri, C.
Ochieng, E.
Tieszen, L. L.
Zhu, Z.
Singh, A.
Loveland, T.
Duke, N.
Title Status and distribution of mangrove forest of the world using earth observation satellite data
Journal name Global Ecology and Biogeography   Check publisher's open access policy
ISSN 1466-822X
Publication date 2011-01
Year available 2010
Sub-type Article (original research)
DOI 10.1111/j.1466-8238.2010.00584.x
Volume 20
Issue 1
Start page 154
End page 159
Total pages 6
Editor Martin T. Sykes
Tim M. Blackburn
David J. Currie
Place of publication Oxford, U.K.
Publisher Blackwell Science
Collection year 2011
Language eng
Formatted abstract
Aim:  Our scientific understanding of the extent and distribution of mangrove forests of the world is inadequate. The available global mangrove databases, compiled using disparate geospatial data sources and national statistics, need to be improved. Here, we mapped the status and distributions of global mangroves using recently available Global Land Survey (GLS) data and the Landsat archive.
Methods:  We interpreted approximately 1000 Landsat scenes using hybrid supervised and unsupervised digital image classification techniques. Each image was normalized for variation in solar angle and earth–sun distance by converting the digital number values to the top-of-the-atmosphere reflectance. Ground truth data and existing maps and databases were used to select training samples and also for iterative labelling.
Results: were validated using existing GIS data and the published literature to map ‘true mangroves’.
Results  The total area of mangroves in the year 2000 was 137,760 km2 in 118 countries and territories in the tropical and subtropical regions of the world. Approximately 75% of world's mangroves are found in just 15 countries, and only 6.9% are protected under the existing protected areas network (IUCN I-IV). Our study confirms earlier findings that the biogeographic distribution of mangroves is generally confined to the tropical and subtropical regions and the largest percentage of mangroves is found between 5° N and 5° S latitude.
Main conclusions:  We report that the remaining area of mangrove forest in the world is less than previously thought. Our estimate is 12.3% smaller than the most recent estimate by the Food and Agriculture Organization (FAO) of the United Nations. We present the most comprehensive, globally consistent and highest resolution (30 m) global mangrove database ever created. We developed and used better mapping techniques and data sources and mapped mangroves with better spatial and thematic details than previous studies.
© 2010 Blackwell Publishing Ltd

Keyword Global distributions
Image processing
Remote sensing
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ
Additional Notes Article first published online: 17 AUG 2010 Early View (Articles online in advance of print)

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
School of Biological Sciences Publications
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Citation counts: TR Web of Science Citation Count  Cited 252 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 350 times in Scopus Article | Citations
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Created: Mon, 15 Nov 2010, 17:54:43 EST by Dr Norman C Duke on behalf of School of Biological Sciences