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Identification of mangroves and coral reefs in the southern Gulf of Kachchh using principal component analysis and geo-spatial techniques: A case study

DRS at CSIR-National Institute of Oceanography

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Title Identification of mangroves and coral reefs in the southern Gulf of Kachchh using principal component analysis and geo-spatial techniques: A case study
 
Creator Prerna, R.
Naidu, V.S.
Soniya, S.
 
Subject mangrove swamps
coral reefs
satellite sensing
geosensing
 
Description The major objectives of this study were to extract the coral reef zones and mangroves using IRS P6 LISS IV data by employing the most appropriate technique, suited for the particular feature. Firstly, a few sample locations of corals were superimposed on the imagery to note the behaviour of the coral pixels was observed, the range of the reflectance values was noted in all bands. Since these values were not normally distributed, it was considered best to use the modal value of the dataset to truly represent the reflectance of coral pixels instead of using the entire range. The final range was taken as 1 from the mode, which was used for the extraction of coral pixels by band mathematics in ENVI 5.0. The findings suggested that corals covered 14.01 km sup(2) of the study area. For extracting the mangroves, the technique of Principal Component Analysis (PCA) was applied. This technique was found to give better results by not only identifying the mangrove swamps but also to differentiate between the dense and sparse mangroves. The greatest variance in the dataset could be identified by this method, thereby making it easier to outline the variations existing within the mangroves. Further classification (by supervised method) of the principal components was required to identify Dense and Sparse mangroves. The final findings highlighted that out of the 89.69 km sup(2) of the study area, mangroves covered 38.35 km sup(2) (42.76 percent). Further classification of the mangroves quantified to 7.47 km sup(2) of dense mangroves and 30.88 km sup(2) of sparse mangroves showing a reasonably high prominence of mangroves in the area. The area quantifications were executed using ArcGIS software.
 
Date 2013-02-01T09:24:33Z
2013-02-01T09:24:33Z
2012
 
Type Conference Article
 
Identifier Proceeding of 13th Esri India User Conference 2012: GIS - Opening our world; Noida; India; 2012; 10pp
http://drs.nio.org/drs/handle/2264/4228
 
Language en
 
Rights Copyright [2012]. All efforts have been made to respect the copyright to the best of our knowledge. Inadvertent omissions, if brought to our notice, stand for correction and withdrawal of document from this repository.
 
Publisher ESRI India