Study of Bathymetry Map Using Landsat ETM+ Data: A Case Study in Menjangan Island, Bali
| Main Authors: | Setiawan, Kuncoro Teguh; Coastal and Marine Resources Division, Indonesian National Institute of Aeronautics and Space (LAPAN), Jalan Lapan No. 8, Pekayon, Pasar Rebo, Jakarta 13710, Indonesia, Osawa, Takahiro; Center for Remote Sensing and Ocean Science (CReSOS), Udayana University, PB Sudirman Street, Post Graduate Building, Denpasar, Bali 80232, Indonesia, Nuarsa, I Wayan; Graduate School of Environmental Sciences, Udayana University, PB Sudirman Street, Post Graduate Building, Denpasar, Bali 80232, Indonesia |
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| Format: | Article eJournal |
| Bahasa: | eng |
| Terbitan: |
Graduate Study of Environmental Sciences, Postgraduate Program of Udayana University
, 2017
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| Subjects: | |
| Online Access: |
http://ojs.unud.ac.id/index.php/ijeg/article/view/28832 |
Daftar Isi:
- Bathymetry is a measure of the depth of the water surface to the sea floor. Bathymetric mapping plays important roles for fisheries and marine activities. Usually bathymetry data source is a bathymetric map issued by Oceanographic Hydrographic Offices, but these data are not cover the whole area in detailed. Remote sensing technology is one way that can be utilized to obtain bathymetry information. This research aims to produce a bathymetry map by applying the algorithm of estimate absolute depth developed by Van Hengel and Spitzer (1991). Three image data were used to comprise a LANDSAT TM data and two LANDSAT ETM+ data which were acquired at March 19, 1997 , June 23, 2000 and March 12, 2003. The three data have an average error of 29%, accuracy of 80% and the correlation coefficient R2 0.439 for 1997, an average error of 24%, accuracy of 70% and a correlation coefficient R2 0.883 for 2000 and the average error of 21%, accuracy of 80% and a correlation coefficient R2 0.998 for 2003. To produce a more complete bathymetric maps then conducted integration methods between the bathymetry of LANDSAT ETM+ and Hidrography Maps. The combined bathymetry maps has semi variance equal to 8 m with a height error map is in the interval of 0-10 m. Bathymetry maps were generated using Kriging interpolation method which showed an average error 36%, accuracy of 60% and a correlation coefficient R2 of 0.620. This study showed the LANDSAT ETM + imagery has the potential to produce bathymetric maps.