Abstract
The development of remote sensing technology has experienced significant progress. This progress is marked by the availability of images of various resolutions with complete channels, open-source, and their development in various image classification techniques such as edge detection techniques. This study aims to examine changes in the coastline in Banmaleng Village, Gili Raja Island, Sumenep Regency using the Canny edge detection algorithm on multitemporal Landsat 7 and 8 imagery in 2005 - 2020. The edging process includes (a) minimize noise by applying a Gaussian filter, (b) determine the image intensity gradient, (c) apply non-maximum emphasis to eliminate spurious responses to objects, (d) define multiple thresholds for determining potential image edges, (e) Track edge hysteresis by pressing all other weak edges that are not connected to firm edges. Canny edge detection produces sharp edges to analyze coast line changes quite well. Every five years, the coastline of Banmaleng Village experienced shifting from 0 , 4 to 2 , 3 meters in several areas. Keywords : Edge Detection, Landsat, Coastline, Canny Algorithm, Gili Raja
Highlights
Coasts are one of the most dynamic habitats on earth
Triatmodjo (2012) states that the coastline is a line that forms the boundary between the land and the ocean, which is influenced by tides and prone to erosion and sedimentation
Ginting & Faristyawan (2020) stated that the coastline position, which is the boundary line between land and water areas, is very complex due to the many interactions between sea, land processes
Summary
The shape of the coast is influenced by natural forces, and in many places, it responds strongly to changing environmental conditions. The coast terminology often interchanges with coastline and seashore Coastline change over time is an interesting event to study. Triatmodjo (2012) states that the coastline is a line that forms the boundary between the land and the ocean, which is influenced by tides and prone to erosion and sedimentation. Ginting & Faristyawan (2020) stated that the coastline position, which is the boundary line between land and water areas, is very complex due to the many interactions between sea, land processes. Liu & Jezek (2004) mention that knowledge related to coastlines is needed as a basis for interpreting the character of coastal and marine resources
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