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Coastal wetland and shoreline change mapping of Pichavaram, south east coast of India using Satellite data
Hong Yeon CHO, Lakshumanan.C
Korea Ocean Research and Development Institute
Ansan, P.O Box29, Seoul 425-600. Korea
Usha Natesan
Centre for Environmental Studies
Anna University
Chennai- 600 025, India
Abstract
Study of Coastal wetland and shoreline changes should be done for better understanding of various conditions of wetland ecosystem and delineation of coastal wetland boundary and its areal extent is important for understand the underlying processes. The conventional method of mapping is very difficult and time consuming and costlier. Since the mangrove forests associated with wetlands are marshy in nature and contain a number of tidal creeks and channels.
The configuration of the entire coastal area can be easily observed through satellite imagery whereas in conventional surveys, it takes long time to accurately arrive at the location and extension of these features. Satellite data by virtue of its repetitive (temporal) multi-spectral and synoptic nature can provide images, which will enable us to observe or study the measure of changes of shoreline and its associated features Nayak et.al (1986).
Manipulation of Remotely Sensed digital data by image processing technique is found to be one of the most useful techniques in extracting details of interest through enhancement as well as classification. Geometric correction was applied to digital data sets using SOI toposheets. Ground truth information on the various coastal wetland classes was transferred to the images and treating statistics and confusion matrix were generated for the ground truth sites. Supervised classification methods have been used for wetland classification. Wetland map for Pichavaram area were prepared from LANDSAT-TM (1987), IRS 1-C (1998) by supervised classification method using ERDAS-IMAGINE Image processing software.
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