碩士 / 國立臺灣海洋大學 / 海洋環境資訊學系 / 95 / This study is concentrated on the image interpretation of remotely- sensed images around the Dong-Sha atoll as an example. From the comparison of characteristics and spatial resolution of different kinds of images, I expect to efficiently recognize the topography and the change of terrain features of Dong-Sha atoll as well as to point out whether or not the deserted stranded ships have been illegally occupied in the atoll.
Through analyses of satellite images and aerial photos of Dong-Sha atoll, I find that though the swath of aerial photo is smaller than that of satellite image, the spatial resolution of aerial photo is higher than that of satellite image. For instance, the image of Formosat-2 with a spatial resolution of 2 m can just find out the distribution of locations of large bamboo-made shelves around coral reef areas. The QuickBird satellite image with a spatial resolution of 0.6 m can identify the construction of ship. Conversely, doing an aerial photographing can plan a new flight in need, can fly over objects more than once, and can adjust the flight height based on height of clouds to take big-size aerial photos with a spatial of 10 cm even to 2-5 cm. The phenomena of the silt in the mouth of lagoons, the texture of bamboo-made shelves, and the construction of ships with fine structures can be recognized in aerial photos.
The currently used sea chart of Dong-Sha waters was drawn forty or fifty years ago. Although it was revised by Ocean Survey Bureau in 2001, the topography of Dong-Sha waters surrounded by coral reef areas has not been the same as that of decades ago. Through the aerial photos of this study, extant stranded ships are left six in coral reef areas. Compared with the ten stranded ships which are listed on the sea chart, six is a more correct statistic number. Due to the change of time, new stranding, relocation because of typhoons, or effloresce, most of the stranded ships have disappeared. Therefore, the sea chart is needed to be modified.
| Identifer | oai:union.ndltd.org:TW/095NTOU5282005 |
| Date | January 2007 |
| Creators | Wei-Hsin Chen, 陳維新 |
| Contributors | 何宗儒 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 63 |
Page generated in 0.009 seconds