Global marine gravity anomalies from Seasat,Geosat,ERS-1,TOPEX/POSEIDON satellite altimetry

• Main Authors: Kao, Eu-Chi, 高豫
• Other Authors: Cheinway Hwang
• Format: Others
• Language: zh-TW
• Online Access: http://ndltd.ncl.edu.tw/handle/65379738807251509118

碩士 === 國立交通大學 === 土木工程學系 === 85 === Global marine gravity anomalies at a 2'x2'grid have been determined fromSe asat﹑Geosat﹑ERS-1 and TOPEX/POSEIDON altimeter data. The inverse VeningMeine sz formula with an 1D FFT method was used to compute gravity anomaliesfrom gri dded north-south and west-east geoid gradients, in a remove-restoreprocedure w ith the EGM96 gravity model as the reference field. The data coverthe area 0° to 360° in longitude and 72°S to 72°N in latitude. In the 12 test areas where ship gravity and satellite-derived gravitywere compared, rms agreements of 6-10 mgals were obtained and the gravityanomalies derived in this work are 0.5 mgal on average better than thosederived by Sandwell and Smith (1997). Th e gravity anomalies are locatedat an ftp site (ftp://gps.cv.nctu.edu.tw) where an application program isavailable for extracting data in a subarea.