GNSS RTK Application to Determine Coastline Case Study at Northen Area of Sulawesi and GorontaloWahyudi Nugraha, Andri Daniel Parapat, Dewi Sekar Arum and Fatichatus IstighfariniE3S Web Conf., 94 (2019) 01016DOI: https://doi.org/10.1051/e3sconf/20199401016