Geometric Quality Assessment of Chang’E-2 Global DEM Product
1
State Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, China
2
School of Geology and Geomatics, Tianjin Chengjian University, Tianjin 300384, China
3
State Key Laboratory of Lunar and Planetary Sciences, Macau University of Science and Technology, Macau 999078, China
4
CAS Center for Excellence in Comparative Planetology, Hefei 230026, China
*
Author to whom correspondence should be addressed.
Remote Sens. 2020, 12(3), 526; https://doi.org/10.3390/rs12030526
Received: 19 December 2019
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Revised: 31 January 2020
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Accepted: 3 February 2020
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Published: 6 February 2020
(This article belongs to the Special Issue Lunar Remote Sensing and Applications)
The Chang’E-2 digital elevation model (DEM, named CE2TMap2015), which is the highest resolution DEM product in China, was released with global coverage of the lunar surface. A detailed geometric quality assessment of the product is desirable for wider applications by users. A novel procedure for evaluating DEM geometric quality, which investigates both the global geometric uncertainty and local gross errors, is proposed in this paper. First, the DEM was divided into regular blocks and matched with the reference DEM. Then, the characteristics of errors were investigated using the statistical information of the matched tie points. Next, the local outlier factor (LOF) algorithm was performed to locate the gross errors. In our experiment, CE2TMap2015 was evaluated using the proposed method, with SLDEM2015 as the reference DEM. The results show that there were widespread geometric inconsistencies with an area-weighted average of 183.1 m horizontally (with the standard deviation being 101.2 m) and 2.3 m vertically (with the standard deviation being 15.4 m). Gross errors were detected automatically and were excluded in the statistical analysis. The periodic errors were extracted in the frequency domain using a Fourier transform. Our research results provide instructional information for the utilization of CE2TMap2015 by world-wide users. The proposed method can be used in the assessment of other planetary DEMs.
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Keywords:
Chang’E-2; DEM assessment; geometric quality; matching; lunar mapping
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MDPI and ACS Style
Xin, X.; Liu, B.; Di, K.; Yue, Z.; Gou, S. Geometric Quality Assessment of Chang’E-2 Global DEM Product. Remote Sens. 2020, 12, 526. https://doi.org/10.3390/rs12030526
AMA Style
Xin X, Liu B, Di K, Yue Z, Gou S. Geometric Quality Assessment of Chang’E-2 Global DEM Product. Remote Sensing. 2020; 12(3):526. https://doi.org/10.3390/rs12030526
Chicago/Turabian StyleXin, Xin, Bin Liu, Kaichang Di, Zongyu Yue, and Sheng Gou. 2020. "Geometric Quality Assessment of Chang’E-2 Global DEM Product" Remote Sensing 12, no. 3: 526. https://doi.org/10.3390/rs12030526
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