碩士 / 國立成功大學 / 測量及空間資訊學系 / 107 / Mean sea surface (MSS) is an important reference for vertical datum to connect land and ocean. MSS represents the surface whose altitude/tidal range is zero for land and ocean applications, respectively. Therefore, establishing MSS is necessary for the vertical datum connection. Satellite altimetry and tide gauge data are commonly used to establish MSS. In the study, tide gauges are divided into long-term and short-term stations with different observation periods. Long-term stations are used to correct seasonal signals and meteorological effect for short-term stations. To convert MSS from orthometric height to the ellipsoidal height, Taiwan Vertical Datum 2001 (TWVD2001) and GNSS observations (TWD97 [2010]) are used; For Satellite altimetry, reference frame transformation is required to merge multi-satellites data. Then, sub-optimal interpolation method is applied to generate the grid format MSS around Taiwan with 2^'×2^' spatial resolution. To keep the continuity from coasts to the offshore and improve the accuracy in coastal regions, we design 12 different ways to merge the two datasets. MSS are compared with tide gauge records. For tide gauge MSS, the offset referenced to TWVD 2001 tide gauge MSS and TWVD2001 becomes larger toward the south due to the changes of sea temperature and salinity. The satellite altimetry MSS is similar to the up-to-date MSS model. The difference of root-mean-square (RMS) is about 25 cm. And for the integrate MSS result, the minimum RMS in the research is 5.3 cm.
| Identifer | oai:union.ndltd.org:TW/107NCKU5367007 |
| Date | January 2019 |
| Creators | Han-WenChang, 張瀚文 |
| Contributors | Chung-Yen Kuo, 郭重言 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 107 |
Page generated in 0.0059 seconds