Application of Remote Sensing Imagery and GIS for Horizontal Shoreline Change Detection

Yongyuth CHATRAPAKPONG and Sakda Khundee


Various optical remote sensing imageries, including digital orthophoto, color aerial photograph, SPOT 5, and Thaichote (THEOS), used to delineate sandy shoreline at the Chalatat Beach extending southeastward to Ban Kao Seng village. Sobel method of edge enhancement was adopted to improve the quality of remote sensing data. Tree alignment was defined to be as baseline in order to help clearly detecting, measuring, and comparing horizontal sandy shoreline change. The study was found that the three status of shoreline occurred, including stable to slightly change, accretion or deposition and also erosional shoreline. The latest seems to be the severe problem in study area.  All status of shoreline was mainly caused by human activities. Simple overlay technique of multi-dote shorelines of 2003, 2006, 2009, and 2011, gave a lot of erosional and depositional evident, which coincided with offshore investigation data such as sea depth and change of sea floor profile. Sand sediment was deposited behind T-groin at Ban Kao Seng village, and long shore sediment was accumulated at the sometime. On the other hand, in case of sediments beneath sea surface moved out, the shoreline erosion will be occurred, especially along the Chalatat beach.