Abstract
A new model to extract coral reef area was proposed and applied to an estimation model of bottom depth. Image density on 1540 pixels of LANDSAT/5-TM and provided data on depth and bottom condition from JODC (Japan Oceanographic Data Center) were used for mapping coral reef area and for estimating bottom depth.Both models were adopted to Okinawa Main Island and Yaeyama Islands and discussed on its practical use. Moreover, limitations of applied model were also discussed and an errors analysis was performed. Depths from surface to 34m were measured with RMS residuals of 3.38m and 4.23 against the data obtained at fine atmospheric and the fine plus cloudy atmospheric conditions, respectively. Two and four bottom features models were compared each other on its application.Finally, using two bottom features model described above, a three-dimensional image and a isodepth image were obtained by a personal computer at an area of Yaeyama Islands.
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