DEM对大地水准面精化的影响分析

doi:10.3969/j.issn.1000-2006.2014.01.026

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南京林业大学学报（自然科学版） ›› 2014, Vol. 38 ›› Issue (01): 145-150.doi: 10.3969/j.issn.1000-2006.2014.01.026

DEM对大地水准面精化的影响分析

王增利^1,2,刘学军¹

1.南京师范大学虚拟地理环境教育部重点实验室,江苏南京 210046;
2.南京林业大学土木工程学院,江苏南京 210037

出版日期:2014-01-15 发布日期:2014-01-15
基金资助:
收稿日期:2012-11-15 修回日期:2013-03-18
基金项目:国家自然科学基金项目(40971230)
第一作者:王增利,实验师,硕士。E-mail: wzl20012001_2001@163.com。
引文格式:王增利,刘学军. DEM对大地水准面精化的影响分析[J]. 南京林业大学学报:自然科学版,2014,38(1):145-150.

Analysis of errors introduced by DEM in geoid refinement

WANG Zengli^1,2, 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

Online:2014-01-15 Published:2014-01-15

摘要/Abstract

摘要： 对厘米级大地水准面精化中影响地形改正精度的几个因子:DEM精度、分辨率及积分半径进行了分析和评价。通过对地形质量影响的球谐展开分析,推导并量化了地形质量与DEM之间的线性关系,从而得到DEM精度至少需达到81 m; 综合分析DEM分辨率与球谐展开级数、积分半径之间的相互关系,给出适合厘米级大地水准面精化的分辨率和积分半径。以我国地表起伏较大的西藏某区为研究区域,选取不同分辨率DEM、不同积分半径,并利用SRTM计算地形影响。结果表明,6″分辨率的DEM和50’的积分半径可以满足大地水准面的厘米级精度要求。

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.

中图分类号:

P225

王增利,刘学军. DEM对大地水准面精化的影响分析[J]. 南京林业大学学报（自然科学版）, 2014, 38(01): 145-150.

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

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DEM对大地水准面精化的影响分析

Analysis of errors introduced by DEM in geoid refinement

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