南京林业大学学报(自然科学版)
南京林業大學學報(自然科學版)
남경임업대학학보(자연과학판)
JOURNAL OF NANJING FORESTRY UNIVERSITY(NATURAL SCIENCE EDITION)
2014年
1期
145-150
,共6页
大地水准面%DEM%地形改正%积分半径%分辨率
大地水準麵%DEM%地形改正%積分半徑%分辨率
대지수준면%DEM%지형개정%적분반경%분변솔
geoid%DEM%terrain correction%integral radius%resolution
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。
對釐米級大地水準麵精化中影響地形改正精度的幾箇因子:DEM精度、分辨率及積分半徑進行瞭分析和評價。通過對地形質量影響的毬諧展開分析,推導併量化瞭地形質量與DEM之間的線性關繫,從而得到DEM精度至少需達到81 m;綜閤分析DEM分辨率與毬諧展開級數、積分半徑之間的相互關繫,給齣適閤釐米級大地水準麵精化的分辨率和積分半徑。以我國地錶起伏較大的西藏某區為研究區域,選取不同分辨率DEM、不同積分半徑,併利用SRTM計算地形影響。結果錶明,6″分辨率的DEM和50′的積分半徑可以滿足大地水準麵的釐米級精度要求。
대전미급대지수준면정화중영향지형개정정도적궤개인자:DEM정도、분변솔급적분반경진행료분석화평개。통과대지형질량영향적구해전개분석,추도병양화료지형질량여DEM지간적선성관계,종이득도DEM정도지소수체도81 m;종합분석DEM분변솔여구해전개급수、적분반경지간적상호관계,급출괄합전미급대지수준면정화적분변솔화적분반경。이아국지표기복교대적서장모구위연구구역,선취불동분변솔DEM、불동적분반경,병이용SRTM계산지형영향。결과표명,6″분변솔적DEM화50′적적분반경가이만족대지수준면적전미급정도요구。
There?re several factors affecting the accuracy of terrain correction to obtain geoid with centimeter-level:accu-racy 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 in-tegral 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.