Coral reef mapping in Vietnam's coastal waters from highspatial resolution satellite and field survey data

Tran, Van Dien, Phinn, S.R. and Roelfsema, C. M. (2012) Coral reef mapping in Vietnam's coastal waters from highspatial resolution satellite and field survey data. Asian Journal of Geoinformatics, 12 2: .

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Author Tran, Van Dien
Phinn, S.R.
Roelfsema, C. M.
Title Coral reef mapping in Vietnam's coastal waters from highspatial resolution satellite and field survey data
Journal name Asian Journal of Geoinformatics   Check publisher's open access policy
ISSN 1513-6728
Publication date 2012
Sub-type Article (original research)
Volume 12
Issue 2
Total pages 12
Place of publication Pathumthani, Thailand
Publisher Asian Remote Sensing Research Information Network
Collection year 2013
Language eng
Abstract A process for mapping the benthic cover of coral reefs at selected sites in Vietnam’s coastal waters from high-spatial resolution, multi-spectral satellite data was developed and tested. GeoEye-1, IKONOS, QuickBird satellite images in Dam Mon, My Giang and Nha Trang respectively were used and field data was collected in 2009. Images were corrected for radiometric, atmospheric, and depth effects. Band combination of three atmospheric corrected bands, second band of PCA, and depth-invariant index of spectral band 1, 2 were used for supervised classification at fine level of description. Calibration and validation field data were acquired through georeferenced photo-transect method and photos were analysed for benthic cover. The overall accuracy of Maximum Likelihood, Minimum Distance to Means and Mahalanobis Distance classifiers were compared for each study site derived from the individual confusion matrix. Overall accuracy of the classified image using Maximum Likelihood classifier were higher than other classifiers in Dam Mon and My Giang, but Mahalanobis Distance classifier was highest in Nha Trang. Overall accuracy of classified image increased when reduced number of benthic classes. Variable environmental conditions, including water clarity and depth, along with reef structures were identified as main factors causing mis-classification and reducing the overall accuracy.
Keyword Benthic cover
Coral reef mapping
GeoEye-1
IKONOS
QuickBird
Snorkelling survey
Vietnam
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: School of Geography, Planning and Environmental Management Publications
Official 2013 Collection
 
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Created: Fri, 05 Apr 2013, 10:33:26 EST by Helen Smith on behalf of School of Geography, Planning & Env Management