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DEM对大地水准面精化的影响分析(PDF)

《南京林业大学学报(自然科学版)》[ISSN:1000-2006/CN:32-1161/S]

Issue:
2014年01期
Page:
145-150
Column:
研究论文
publishdate:
2014-02-16

Article Info:/Info

Title:
Analysis of errors introduced by DEM in geoid refinement
Article ID:
1000-2006(2014)01-0145-06
Author(s):
WANG Zengli12 LIU Xuejun1
1. Key Laboratory of Virtual Geographic Environment,Ministry of Education,Nanjing Normal University,Nanjing 210046,China;
2. College of Civil Engineering,Nanjing Forest University,Nanjing 210037,China
Keywords:
geoid DEM terrain correction integral radius resolution
Classification number :
P225
DOI:
10.3969/j.issn.1000-2006.2014.01.026
Document Code:
A
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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Last Update: 2014-01-15