This project continues the “Bathymetric data and Height Datum Analysis” work conducted in 2012. There are four subjects within the scope of this project. First, the stability analysis of Dongsha and Yangmingshan satellite tracking station is continued and expanded to Taiwan tracking stations located in Peikang and Kenting for comparison. Secondly, tidal observation and analysis are maintained for Dongsha. Thirdly, the operation procedure of coral reef patch mapping is improved and ten 1/5000 map sheets are produced. In addition, the purchase of Zhang-Tan-Li tidal station for National Museum of Marine Science and Technology in Keelung is accomplished. And tidal observation and analysis are maintained for Cheng-Bin and Zhang-Tan-Li tide stations. Regarding the long-term analysis of satellite tracking stations, the velocity field of tracking stations are generally toward north and east. And the trends of velocity field magnitude are reduced from north to south of Taiwan. In Dongsha tidal analysis, the mean sea levels computed by arithmetic mean and harmonic analysis of observations are -0.0126m and -0.0164m from the continuous tide gauge. The operation procedure of coral reef patch mapping is improved and ten 1/5000 map sheets are produced. The purchase of Zhang-Tan-Li tidal station and maintenance of Cheng-Bin and Zhang-Tan-Li tidal stations are accomplished.