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In global context, the anthropogenic pressure increases the loss of wetland and its resources. Wetlands and estuaries are highly productive and act as critical habitats for a variety of plants, fish, shellfish, and other wildlife. The detection and evaluation of the wetland with modern technology is an important phenomenon to conserve the wetland area and its ecosystem. Remote sensing (RS) has a long history of successful applications within the field of wetland delineation, using a multitude of satellite platforms and sensors. This paper is trying to explore the object-based approach to derive the change detection of wetland of selected administrative areas of South Eastern coast in Ampara District within the period of 1991 to 2017. Further, it also explores the human activities that pressure on wetland including agricultural practices (land encroachment), new settlements, solid waste dumping, land cover changes etc. Satellite Imagery (Landsat) and topohseets were georeferenced for the overlay analysis and Ground control points with GPS also collected to secure the precision. Also, Google Earth imagery of 1991 and 2017 were collected and subjected to the GIS analysis for the conclusion. According to the results, agricultural land have increased by 9.4 per cent in 1991 and 16.4 per cent in 2017. Built-up land shows the increase of 0.1 per cent in 1991 and 2.1 per cent in 2017 and the Forest land has decreased as 80.3 per cent in 1991 and 72.2 percent in 2017.

sustainable geoscience and geotourism

Application of Geospatial Technology for Wetlands’ Mapping and Change-Detection: A Case Study in Selected Areas of South Eastern Coast in Ampara District, Sri Lanka