西南石油大学学报(自然科学版) ›› 2009, Vol. 31 ›› Issue (2): 56-58.DOI: 10.3863/j.issn.1674-5086.2009.02.014

• 地质勘探 • Previous Articles     Next Articles

THE GRAVITY FIELD MODEL AND DEM IMPROVING THE GPS ELEVATION CONVERSION ACCURACY

SONG Lei1，2 HUANG Teng1 FANG Jian2 JIANG Min-wei1   

  1. 1.College of Civil Engineering，Hehai University，Nanjing Jiangsu 210098，China；2.Key Laboratory of Dynamical Geodesy，Institute of Geodesy and Geophysics，Chinese Academy of Sciences，Wuhan Hubei 430077，China
  • Received:1900-01-01 Revised:1900-01-01 Online:2009-04-20 Published:2009-04-20

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Abstract: In order to fully utilize the elevation information of GPS observation date and to improve the precision of normal height of observation point that are converted from GPS ellipsoid height in mountainous area，the gravity field model and
Digital Elevation Model（DEM）that are published recently are used to convert GPS elevation with the remove-match-restore method.The matched elevation is compared with that of three-grade leveling measure.The statistical results show that high-precision gravity field models can improve the accuracy of GPS elevation transformation up to 50% in mountainous area.In a certain extent，the terrain correction can improve the accuracy of GPS elevation conversion.The correction of elevation anomaly induced by terrain are relevant with undulation of terrain and elevation difference among GPS observation points.The conclusion is important to get high-precision normal elevation from the GPS observation information in mountainous area where the leveling is difficult to carry out.

Key words: gravity field model, digital elevation model （DEM）, GPS, anomaly, quasi-geoid

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