测绘通报 ›› 2018, Vol. 0 ›› Issue (2): 116-119,130.doi: 10.13474/j.cnki.11-2246.2018.0056

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Elevation Accuracy Assessing of SRTM,ASTER GDEM and AW3D Using GNSS Dynamic Precise Point Positioning(PPP)Data

WEI Dehong1, ZHANG Yongyi2, ZHANG Xingfu1   

  1. 1. Guangdong University of Technology, Department of Surveying and Mapping, Guangzhou 510006, China;
    2. Guangzhou Urban Planning Design & Survey Research Institute, Guangzhou 510060, China
  • Received:2017-05-05 Online:2018-02-25 Published:2018-03-06

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Abstract:

SRTM,ASTER GDEM and AW3D are typical global digital elevation models (DEMs) and they gradually play a critical role in many applications.This paper aimed to assess SRTM,ASTER GDEM and AW3D using GNSS dynamic precise point postioning (PPP) data.Firstly,we collected data by GNSS system fixed on the roof of a car along Guangzhou to Zhaoqing highway and subsequently obtained dynamic measuring data by PPP technology.Secondly,we transformed the ellipsoidal height of dynamic measuring points to orthometric height by earth gravitation model 2008 (EGM2008) and instrument height.Finally,four interpolation methods (Linear,Nearest,Cubic and Spline) are used to validate the orthometric heights of SRTM,ASTER GDEM and AW3D.The results show that the interpolation results of four methods have a good consistency and the standard deviations (STDs) of height of SRTM3 V4.1,ASTER GDEM V2,AW3D30 are better than 3.4,4.1,and 3.3 m respectively.The validating results of three DEMs are better than their target height accuracies of 16,17,and 5 m respectively.The proposed method is quick,efficient,and applicable for assessing DEMs.

Key words: GDEM, dynamic PPP, EGM 2008, accuracy check

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