REMOTE SENSING IN MEASURING AND MONITORING GEOPHYSICAL CHANGES IN RIVERS AND COASTLINES

The study aimed to detect geophysical changes of rivers and coastlines in Pangasinan, Zambales and Bataan using Google Earth measuring tools and Historical Imagery. Clear satellite imageries of the sites were selected for accuracy and better judgment of the image from 2004 to 2016. The Path Tool was used for tracing the riverbank and the coastlines and was used also for measuring the width of the riverbanks and the movement of the coastlines. The Placemark served as sampling points of measurement and placed every 500 meters in the riverbanks and the coastlines. RMSE was computed between field and Remote sensing measurements to determine accuracy. Community survey near the sites were done and the record of tide levels were gathered to support the claims of the geophysical changes.