[1]JIANG Guangxin,XIE Yuanli,GAO Zhiyuan,et al.Evaluation on Elevation Accuracy of Commonly Used DEM in Five Typical Areas of China[J].Research of Soil and Water Conservation,2020,27(05):72-80.
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Evaluation on Elevation Accuracy of Commonly Used DEM in Five Typical Areas of China
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
27
Number of periods:
2020 05
Page number:
72-80
Column:
目次
Public date:
2020-08-20
- Title:
- Evaluation on Elevation Accuracy of Commonly Used DEM in Five Typical Areas of China
- Keywords:
- accuracy evaluation; ICESat/GLAS GLAH14; elevation error; SRTM DEM; ASTER V2; terrain factors; land coverage
- CLC:
- P208
- DOI:
- -
- Abstract:
- This study explored the error distribution characteristics of 3 commonly used DEMs in different landform areas in China to support for application of 3 DEMs in different research area. This study selected 5 typical regions of China(North China Plain, Loess Plateau, Qinghai-Tibet Plateau, Tarim Basin and Yunnan-Guizhou Plateau)as research areas, with ICESat/GLAS GLAH14 points data as the reference elevation, and 3 most commonly used DEM data, SRTM 1 Arc-Second Global(SRTMGL1), SRTM Version 4(SRTM V4), ASTER GDEM V2(ASTER V2)were selected as the accuracy evaluation data. Combined with terrain factors and land coverage, a comparative analysis about the elevation accuracy of the 3 DEMs in the 5 types of research areas was made. The results show that:(1)in the 5 types of research areas, the SRTMGL1 data accuracy is better than SRTM V4 and ASTER V2 in general, among which the 3 kinds of DEM in the Tarim Basin have the highest precision and that in the Yunnan-Guizhou plateau has the lowest precision;(2)the data accuracy of SRTMGL1 is higher than that of ASTER V2 and SRTM V4 in different slopes; the plain area(<10°), two types of SRTM DEM have similar precision, which can complement each other; in high vegetation coverage and large slope area, SRTMGL1's data accuracy is generally optimal, ASTER V2's accuracy is close to SRTMGL1's, and SRTM V4 is the most affected by slope and has the lowest accuracy;(3)the aspect has little effect on the 3 types of DEM and can be ignored;(4)the 3 types of DEM have the highest precision in the area covered by cultivated land and artificial surface, and the DEMs have the lowest precision in the forest coverage area;(5)different geomorphological divisions have the greater impact on the accuracy of the 3 DEMs. SRTMGL1 has the best accuracy and is least affected by terrain and surface coverage. Secondly, SRTM V4 has better accuracy in the plain area and is most affected by the terrain, ASTER V2 has better accuracy in the area with complex landforms and covered by vegetation, and both have their own advantages and disadvantages.
- References:
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Last Update:
2020-08-25