GNSS RTK Application to Determine Coastline Case Study at Northen Area of Sulawesi and Gorontalo

Geospatial Information Agency, 16911 Cibinong West Java, Indonesia

^* Corresponding author: wahyudi.nugraha@big.go.id

Abstract

Article 12 of Indonesia Government Regulation No.4-year 2011 about Geospatial Information [5], coastline is an element of base map. Article 13 subsection 1 states that the boundary form between the land and the ocean were affected by the tides. In subsection 2, coastline is divided into three types, namely lowest, highest, and mean sea level tides. Studies about coastline is important to support many maritime activities such as to determine administrative area (such as province, etc.), determine the length of coastline, coastal and marine management, also inland and marine spatial planning. Due to the importance of coastline, data with good accuracy is needed. Coastline mapping technology has developed rapidly. Previous method of coastline mapping is to trace marine debris carried by wave to the coast. At present time, because of needs of coastline data with higher accuracy and in the bigger scales, the GNSS RTK technology is starting to be used. GNSS technology generated coordinates and elevation and use tides values as reference datum. After the above, Digital Elevation Model generated from those points are combined with bathymetry and land elevation data resulting three types of coastline in accordance with the Indonesia Government Regulation about Geospatial Information Article 13 Subsection 2.