WU Yuxin,ZHAO Mudan,GAO Zhiyuan,et al.Comparison Analysis of Accuracy of SRTMGL1 and SRTM V4 in Three Typical Regions of China[J].Research of Soil and Water Conservation,2019,26(04):36-42.
中国3类典型区SRTMGL1和SRTMV4精度对比分析
- Title:
- Comparison Analysis of Accuracy of SRTMGL1 and SRTM V4 in Three Typical Regions of China
- 关键词:
- SRTMDEM; ICESat/GLAS; 高程误差; 地表覆盖分类; 地形因子
- Keywords:
- SRTM DEM; ICESat/GLAS; elevation error; land-use classification; terrain factors
- 分类号:
- P208
- 摘要:
- 以中国3类典型地区（华北平原、云贵高原和青藏高原）为研究区，利用ICESat/GLAS数据作为高程控制点数据，以SRTM的两种分辨率数据SRTM 1 Arc-Second Global（SRTMGL1）和SRTM Version 4（SRTM V4）数据作为精度评价数据，结合地形要素和土地覆盖要素，综合对两种DEM在3类典型区的精度进行了评价比对。结果表明：（1）在3类研究区中，总体上SRTMGL1数据精度优于SRTM V4数据精度，其中华北平原研究区两种DEM精度最高，云贵高原研究区两种DEM精度最低。（2）在不同的坡度分级内，SRTMGL1的数据精度皆高于SRTM V4数据，在较小的坡度区间内，两者精度差别不大。大坡度、高植被覆盖对于SRTMGL1精度衰减影响较大。（3）在4种地貌区内，两种DEM的相对精度和绝对精度随地形变化有不同的分异规律。其中在相对精度方面，山脊点处SRTMGL1数据高程测量值较SRTM V4数据偏大，山谷点处SRTM V4测量值较SRTMGL1数据偏大；在绝对精度方面，两种DEM与ICESat/GLAS控制点差值剖面线随地形变化明显，在平缓地区，差值剖面线振幅小，两种DEM差值相接近，在高起伏地区，剖面线振幅大，且SRTM V4差值曲线较SRTMGL1剖面曲线振幅偏大，两者差值大。（4）在华北平原研究区和云贵高原研究区内，高植被覆盖区两种DEM误差最大，裸地和人造表面误差最小；在青藏高原地区，冰川覆盖区误差最大，水体区误差最小。
- Abstract:
- Three typical regions in China (North China Plain, Yunnan-Guizhou Plateau and Qinghai-Tibet Plateau) were selected as the study areas. ICESat/GLAS data were used as elevation control point data, SRTM 1 Arc-Second Global (SRTMGL1) and SRTM Version 4 (SRTM V4) data were used as precision evaluation data, and terrain and surface coverage factors were combined to synthesize the two DEMs in three typical regions. The accuracy of the zone was evaluated and compared. The results showed that: (1) in the three types of research areas, the accuracy of SRTMGL1 data was better than that of SRTM V4 data, of which the two DEMs in North China Plain were the best, and the two DEMs in Yunnan-Guizhou Plateau were the worst; (2) the data accuracy of SRTMGL1 was better than that of SRTM V4 in different slope grading, and there was little difference between them in a small slope range; large slope and high vegetation coverage had great influence on SRTMGL1 accuracy attenuation; (3) the relative and absolute accuracy of the two DEMs varied with the topography in the four geomorphological regions; in terms of relative accuracy, the SRTMGL1 data elevation at the ridge points was larger than that of SRTM V4 data, and the SRTM V4 data at the valley points was larger than that of SRTMGL1 data; in terms of absolute accuracy, the difference profiles between the two DEMs and ICESat/GLAS control points changed significantly with the terrain; in the gentle terrain area, the amplitude of difference profiles was small, and the difference between the two DEMs was close; in the high undulating area, the amplitude of section lines was large, and the amplitude of SRTM V4 difference value curve was larger than that of SRTMGL1 profile curve; (4) in the study area of North China Plain and Yunnan-Guizhou Plateau, the two DEM errors of high vegetation coverage area were the largest, while the errors of bare land and artificial surface were the smallest; in the Qinghai-Tibet Plateau, the error of the glacier coverage area was the largest and the water area error was the smallest.
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相似文献/References:
[1]高志远,谢元礼,刘状,等.陕北黄土区SRTMDEM精度对不同地形因子的响应[J].水土保持研究,2019,26(03):174.
GAO Zhiyuan,XIE Yuanli,LIU Zhuang,et al.Response of SRTM DEM Accuracy to Different Terrain Factors in the Loess Area of Northern Shaanxi Province[J].Research of Soil and Water Conservation,2019,26(04):174.
备注/Memo
收稿日期:2018-09-17;改回日期:2018-10-07。
基金项目:国家自然科学基金“梯田对坡度坡长因子的扰动特征研究”（41271284）
作者简介:吴宇鑫(1994-),女,陕西西安人,硕士研究生,研究方向为数字地形分析。E-mail:806731476@qq.com
通讯作者:赵牡丹(1969-),女,陕西富平人,博士,副教授,主要从事GIS空间分析研究。E-mail:zmudan@nwu.edu.cn