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《Beijing Surveying and Mapping》 2018-10
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Analysis of Influence of Residual Terrain Model on GNSS Height Transformation

LIU Cheng;China Railway Design Corporation;  
The ultra-high-order gravity field models such as EGM2008 and EIGEN-6 C4 is as high as 2190,and can greatly improve the accuracy of GNSS height transformation.Although the order of these ultra high order models is more higher than the other models,it is not possible to represent elevation anomaly information in full frequency bands.For this purpose,DTM data can be used to construct the remaining terrain model and transform it into residual elevation anomalies to the super high-order model.The truncation error is compensated.This paper uses the data of a dedicated passenger line as an example to analyze the contribution of the remaining terrain model to the GNSS height transformation,different fitting methods such as plane fitting、straight line and curve fitting and so on are used for comparative analysis,and draw some empirical conclusions.
【CateGory Index】: P228.4
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