Orthometric Height Determination by GPS Ellipsoidal Heights and a prior Information of Local Geoid

• Main Authors: Jung-Ho Tseng, 鄭榮和
• Other Authors: R.J.YOU
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/89196148514682628033

碩士 === 國立成功大學 === 測量工程學系 === 89 === The datum inconsistency must be taken into consideration for the orthometric height determination by integration of GPS heights,spirit heights and the geoidal undulation ,because those heights refer to different reference surfaces. In the study, a height datum transformation model has been developed,and the least squares collocation has been used for solving the systematic errors caused by a priori undulation model and height networks. It is shown that the transformation model developed in the study can improve the absolute accuracy of orthometric heights compared with models that do not consider the datum inconsistency problem and the systematic errors. The absolute accuracy of transformed orthometric heights is about 2-3 cm both for the local and for linear leveling height transformation with a global undulation model EGM96 or a local undulation model. But the relative accuracy of all transformation models tested in the study is similar.