The accuracy of coastline base map data for Indonesia could be much improved by making use of Lidar bathymetry technology. In this article, the authors describe how Lidar bathymetry survey techniques were applied to a section of coastline in the Sunda Strait.
From an article in Hydro International by Agung Syetiawan and Herjuno Gularso.
The determination of a sea or coastal area depends on the availability of coastline data, as it is based on the coastline reference (see Figure 1). The definition of the area of Indonesia’s sovereignty could be improved if it were based on accurate coastline data. Unfortunately, a coastline base map at a scale of 10,000 was only available for about 8% of the total of 108,000km of coastline in Indonesia in 2019. Shoreline data was therefore generated by integrating elevation data (Digital Elevation Model; DEM) for land and sea that was obtained by topographic and bathymetric surveys. However, the topographical conditions in Indonesia are unique, with shallow water characteristics. Furthermore, some of the coastal areas are inland seas that are difficult to access using technologies such as sounding sensors. An alternative method is therefore needed to accelerate the availability of coastline data in Indonesia that utilizes Lidar technology for bathymetry survey activities. Improving the availability of coastline data on a large scale is expected to benefit the national economy, in particular the maritime sector.
Airborne Lidar Bathymetry
Lidar (Light Detection and Ranging) is part of a remote sensing system that uses active sensors and that works by comparing the characteristics of the transmission signal with its reflection; namely, the differences in pulse propagation time, wavelength and angle of reflection. In the Lidar bathymetry application, the laser used is a green light that can penetrate to the bottom of the water. When the laser hits the surface of the water, part of the laser wave is reflected and refracted in all directions and another part penetrates the water. The basic principles of Lidar bathymetry are shown in Figure 2.
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