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OALib Journal期刊
ISSN: 2333-9721
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dem对大地水准面精化的影响分析
DOI: 10.3969/j.issn.1000-2006.2014.01.026, PP. 145-150
Keywords: 大地水准面,dem,地形改正,积分半径,分辨率
Abstract:
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81m;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。
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