Analysis of errors introduced by DEM in geoid refinement

WANG Zengli, LIU Xuejun

Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2014, Vol. 38 ›› Issue (01) : 145-150.

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南京林业大学学报（自然科学版）
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Journal of Nanjing Forestry University (Natural Sciences Edition） ›› 2014, Vol. 38 ›› Issue (01) : 145-150. DOI: 10.3969/j.issn.1000-2006.2014.01.026

Analysis of errors introduced by DEM in geoid refinement

  • WANG Zengli1,2, LIU Xuejun1
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Abstract

There’re several factors affecting the accuracy of terrain correction to obtain geoid with centimeter-level: accuracy of DEM,resolution and the integral radius. Derive the linear relationship between DEM and terrain correction by computing the spherical harmonic expansions. The result showed that the accuracy of DEM should be better than 81m. After the relationship between resolution and the degree of spherical harmonic expansions and integral radiusanalyzed, the best suitable factors for geoid with centimeter-level was giant.This article chosed different resolution and different integral radius to compute terrain correction with DEM of Tibet. The test results showed that the resolution of 6″ DEM could meet the needs of geoid with centimeter-level. And it needs 50’ integral radius to meet the corresponding requirements.

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WANG Zengli, LIU Xuejun. Analysis of errors introduced by DEM in geoid refinement[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 2014, 38(01): 145-150 https://doi.org/10.3969/j.issn.1000-2006.2014.01.026

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