利用升降轨sentinel-1A提取昆明DEM及其精度分析
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摘要
昆明位于低纬度高海拔区域,海拔在2 000 m左右,为了分析利用INSAR技术提取昆明城区的DEM精度。文中利用升降轨模式下的sentinel-1A获取昆明区域DEM,然后通过相关系数值法和均值法分别对升降轨DEM进行数据融合,对两种融合方法得到的DEM进行对比,结果显示前者比后者得到DEM的精度高。再将相干系数法融合得到DEM与SRTM3 DEM在相同区域采用叠加分析的相减法得到高程异差图,最后由检查点法和剖面法分别对高程异差图进行精度分析。结果表明,融合DEM有效的消除雷达叠掩、透视收缩等引起的"空洞"现象,更好显示地面起伏和纹理特征。其高程异差值统计标准差为±29. 50 m,高程异差值的绝对值小于30 m的区域占84. 5%。
Kunming is located at a low latitude and high altitude,with an altitude of about 2000 meters. In order to analyze the DEM accuracy by using INSAR technology in Kunming City,in the paper,DEM was got using descending mode Sentinel-1A,and then the data fusion of DEM was carried out by the correlation coefficient value method and the average method respectively. Comparing the DEM obtained by the two fusion methods,the results showed that the former had higher precision than the latter. Then the coherence coefficient method was combined to obtain the elevation difference map by the subtraction method of DEM and SRTM3 DEM in the same region. Finally,the checkpoint method and the profile method were used to analyze the accuracy of the elevation heterodyne map. Results showed that the fusion of DEM effectively eliminated the " hollow" phenomenon caused by the radar mask stack,the foreshortening and so on,better displaying the surface relief and the texture feature. The statistical standard deviation of the elevation difference was ± 29. 50 m,and the area where the absolute value of the elevation difference was less than 30 m accounted for 84. 5%.
Kunming is located at a low latitude and high altitude,with an altitude of about 2000 meters. In order to analyze the DEM accuracy by using INSAR technology in Kunming City,in the paper,DEM was got using descending mode Sentinel-1A,and then the data fusion of DEM was carried out by the correlation coefficient value method and the average method respectively. Comparing the DEM obtained by the two fusion methods,the results showed that the former had higher precision than the latter. Then the coherence coefficient method was combined to obtain the elevation difference map by the subtraction method of DEM and SRTM3 DEM in the same region. Finally,the checkpoint method and the profile method were used to analyze the accuracy of the elevation heterodyne map. Results showed that the fusion of DEM effectively eliminated the " hollow" phenomenon caused by the radar mask stack,the foreshortening and so on,better displaying the surface relief and the texture feature. The statistical standard deviation of the elevation difference was ± 29. 50 m,and the area where the absolute value of the elevation difference was less than 30 m accounted for 84. 5%.
引文
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[17]蒋厚军,廖明生,张路,等.高分辨率雷达卫星COSMO-Sky Med干涉测量生成DEM的实验研究[J].武汉大学学报(信息科学版),2011,36(9):1055-1058.
[18]沈强,鄂栋臣,周春霞.利用ASTER立体像对提取Grove山地区相对DEM及精度分析[J].测绘通报,2008(1):22-25.
[19]黄洁慧,谢谟文,王增福,等. In SAR技术获取高山峡谷区DEM精度研究[J].遥感信息,2012(1):62-67.
[2]薛继群,邓喀中,范洪冬,等.基于In SAR技术对西部高山地区DEM的重建[J].测绘工程,2011,20(3):25-27,32.
[3]单新建,宋晓宇,柳稼航,等.星载In SAR技术在不同地形地貌区域的DEM提取及其应用评价[J].科学通报,2001,46(24):2074-2079.
[4]何敏,何秀凤.利用星载In SAR技术提取镇江地区DEM及其精度分析[J].计算机应用,2010,30(2):537-539.
[5]岳焕印,郭华东,王长林,等.利用ERS-1/2重轨干涉SAR数据提取DEM及其精度分析[J].测绘通报,2001(8):16-18.
[6] Geymen A. Digital elevation model(DEM)generation using the SAR interferometry technique[J]. Arabian Journal of Geosciences,2014,7(2):827-837.
[7]陈鹏琦,龙四春,蒋宗立,等.基于Tan DEM-X和ERS数据的In SAR提取DEM的实验研究[J].湖南科技大学学报(自然科学版),2015,30(4):21-26.
[8]王琴,陈蜜,刘书军,等.利用升降轨道SAR数据获取DEM的试验研究[J].测绘通报,2015(6):39-43.
[9]舒宁.雷达影像干涉测量原理[M].武汉:武汉大学出版社,2003.
[10] Farr T G,Rosen P A,Caro E,et al. The Shuttle Radar Topography Mission[J]. Reviews of Geophysics,2007,1(2):361.
[11] Andrew Sowter,Moh. Che Amat,Francesca Cigna,Stuart Marsh,Ahmed Athab,Lubna Alshammari. Mexico City land subsidence in 2014-2015 with Sentinel-1 IW TOPS:results using the Intermittent SBAS(ISBAS)technique[J]. International Journal of Applied Earth Observations and Geoinformation,2016.
[12]吴文豪.哨兵雷达卫星TOPS模式干涉处理研究[D].武汉:武汉大学,2016.
[13]吴文豪,周志伟,李陶,等.精密轨道支持下的哨兵卫星TOPS模式干涉处理[J].测绘学报,2017,46(9):1156-1164.
[14]白泽朝,靳国旺,张红敏,等.天津地区Sentinel-1A雷达影像PSIn SAR地面沉降监测[J].测绘科学技术学报,2017,34(3):283-288.
[15]刘国祥,丁晓利,李志林,等.使用In SAR建立DEM的试验研究[J].测绘学报,2001,30(4):336-342.
[16]张子文,杨帆,吴文豪,等.地下水开采与地面沉降关系的短基线集分析[J].测绘科学,2016,41(6):64-69,134.
[17]蒋厚军,廖明生,张路,等.高分辨率雷达卫星COSMO-Sky Med干涉测量生成DEM的实验研究[J].武汉大学学报(信息科学版),2011,36(9):1055-1058.
[18]沈强,鄂栋臣,周春霞.利用ASTER立体像对提取Grove山地区相对DEM及精度分析[J].测绘通报,2008(1):22-25.
[19]黄洁慧,谢谟文,王增福,等. In SAR技术获取高山峡谷区DEM精度研究[J].遥感信息,2012(1):62-67.