The travertine terraces of the Bora coast, at the southeastern part of Miyako Island, Okinawa Prefecture have been designated and notified as a new natural monument by the Ministry of Education, Culture, Sports, Science and Technology and Agency for Cultural Affairs. They are distributed in a small area, ca. 70 m (long) × 30 m (wide), and lie between the low-tide level and 6 m a.s.l. Their diameters are between 10 cm (minimum) and 6 m (maximum), while the relative heights among rimstone pools are between 1 cm and 1 m. The terrestrial laser scanner (TLS) technique is an effective method for drawing precise contour maps and expressing complex small-scale topography. In addition, it is cheaper and less time consuming than producing a map with a total station. To express the characteristics of the travertine terraces, precise contour maps are drawn with 2.5 cm and 20 cm contour intervals using a TLS (VZ-400) and software programs. Information is provided for readers who need to draw a precise contour map successfully with TLS and software programs. The principle and application of the terrestrial laser scanning method are described in the text. Large-scale precise contour maps and photographs of travertine terraces are also presented.
2017 公益社団法人 東京地学協会