Accuracy Comparison and Assessment of DSM Derived from GFDM Satellite and GF-7 Satellite Imagery
Digital Surface Model (DSM) derived from high resolution satellite imagery is important for various applications. GFDM is China’s first civil optical remote sensing satellite with multiple agile imaging modes and sub-meter resolution. Its panchromatic resolution is 0.5 m and 1.68 m for multi-spectra...
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| Format: | Article |
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MDPI AG
2021-11-01
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| Series: | Remote Sensing |
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| Online Access: | https://www.mdpi.com/2072-4292/13/23/4791 |
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| author | Xiaoyong Zhu Xinming Tang Guo Zhang Bin Liu Wenmin Hu |
| author_facet | Xiaoyong Zhu Xinming Tang Guo Zhang Bin Liu Wenmin Hu |
| author_sort | Xiaoyong Zhu |
| collection | DOAJ |
| description | Digital Surface Model (DSM) derived from high resolution satellite imagery is important for various applications. GFDM is China’s first civil optical remote sensing satellite with multiple agile imaging modes and sub-meter resolution. Its panchromatic resolution is 0.5 m and 1.68 m for multi-spectral images. Compared with the onboard stereo viewing instruments (0.8 m for forward image, 0.65 m for back image, and 2.6 m for back multi-spectrum images) of GF-7, a mapping satellite of China in the same period, their accuracy is very similar. However, the accuracy of GFDM DSM has not yet been verified or fully characterized, and the detailed difference between the two has not yet been assessed either. This paper evaluates the DSM accuracy generated by GFDM and GF-7 satellite imagery using high-precision reference DSM and the observations of Ground Control Points (GCPs) as the reference data. A method to evaluate the DSM accuracy based on regional DSM errors and GCPs errors is proposed. Through the analysis of DSM subtraction, profile lines, strips detection and residuals coupling differences, the differences of DSM overall accuracy, vertical accuracy, horizontal accuracy and the strips errors between GFDM DSM and GF-7 DSM are evaluated. The results show that the overall accuracy of both is close while the vertical accuracy is slightly different. When regional DSM is used as the benchmark, the GFDM DSM has a slight advantage in elevation accuracy, but there are some regular fluctuation strips with small amplitude. When GCPs are used as the reference, the elevation Root Mean Square Error (RMSE) of GFDM DSM is about 0.94 m, and that of GF-7 is 0.67 m. GF-7 DSM is more accurate, but both of the errors are within 1 m. The DSM image residuals of the GF-7 are within 0.5 pixel, while the residuals of GFDM are relatively large, reaching 0.8 pixel. |
| first_indexed | 2024-03-10T04:46:14Z |
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| id | doaj.art-318cf52cd04f44edbc61b5a45f4be4a4 |
| institution | Directory Open Access Journal |
| issn | 2072-4292 |
| language | English |
| last_indexed | 2024-03-10T04:46:14Z |
| publishDate | 2021-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Remote Sensing |
| spelling | doaj.art-318cf52cd04f44edbc61b5a45f4be4a42023-11-23T02:56:25ZengMDPI AGRemote Sensing2072-42922021-11-011323479110.3390/rs13234791Accuracy Comparison and Assessment of DSM Derived from GFDM Satellite and GF-7 Satellite ImageryXiaoyong Zhu0Xinming Tang1Guo Zhang2Bin Liu3Wenmin Hu4The State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, ChinaThe State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, ChinaThe State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan University, Wuhan 430079, ChinaState Key Laboratory of Remote Sensing Science, Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 100101, ChinaThe National Joint Engineering Laboratory of Internet Applied Technology of Mines, China University of Mining and Technology, Xuzhou 221116, ChinaDigital Surface Model (DSM) derived from high resolution satellite imagery is important for various applications. GFDM is China’s first civil optical remote sensing satellite with multiple agile imaging modes and sub-meter resolution. Its panchromatic resolution is 0.5 m and 1.68 m for multi-spectral images. Compared with the onboard stereo viewing instruments (0.8 m for forward image, 0.65 m for back image, and 2.6 m for back multi-spectrum images) of GF-7, a mapping satellite of China in the same period, their accuracy is very similar. However, the accuracy of GFDM DSM has not yet been verified or fully characterized, and the detailed difference between the two has not yet been assessed either. This paper evaluates the DSM accuracy generated by GFDM and GF-7 satellite imagery using high-precision reference DSM and the observations of Ground Control Points (GCPs) as the reference data. A method to evaluate the DSM accuracy based on regional DSM errors and GCPs errors is proposed. Through the analysis of DSM subtraction, profile lines, strips detection and residuals coupling differences, the differences of DSM overall accuracy, vertical accuracy, horizontal accuracy and the strips errors between GFDM DSM and GF-7 DSM are evaluated. The results show that the overall accuracy of both is close while the vertical accuracy is slightly different. When regional DSM is used as the benchmark, the GFDM DSM has a slight advantage in elevation accuracy, but there are some regular fluctuation strips with small amplitude. When GCPs are used as the reference, the elevation Root Mean Square Error (RMSE) of GFDM DSM is about 0.94 m, and that of GF-7 is 0.67 m. GF-7 DSM is more accurate, but both of the errors are within 1 m. The DSM image residuals of the GF-7 are within 0.5 pixel, while the residuals of GFDM are relatively large, reaching 0.8 pixel.https://www.mdpi.com/2072-4292/13/23/4791DSMGFDM DSMGF-7 DSMGCPsaccuracy assessment |
| spellingShingle | Xiaoyong Zhu Xinming Tang Guo Zhang Bin Liu Wenmin Hu Accuracy Comparison and Assessment of DSM Derived from GFDM Satellite and GF-7 Satellite Imagery Remote Sensing DSM GFDM DSM GF-7 DSM GCPs accuracy assessment |
| title | Accuracy Comparison and Assessment of DSM Derived from GFDM Satellite and GF-7 Satellite Imagery |
| title_full | Accuracy Comparison and Assessment of DSM Derived from GFDM Satellite and GF-7 Satellite Imagery |
| title_fullStr | Accuracy Comparison and Assessment of DSM Derived from GFDM Satellite and GF-7 Satellite Imagery |
| title_full_unstemmed | Accuracy Comparison and Assessment of DSM Derived from GFDM Satellite and GF-7 Satellite Imagery |
| title_short | Accuracy Comparison and Assessment of DSM Derived from GFDM Satellite and GF-7 Satellite Imagery |
| title_sort | accuracy comparison and assessment of dsm derived from gfdm satellite and gf 7 satellite imagery |
| topic | DSM GFDM DSM GF-7 DSM GCPs accuracy assessment |
| url | https://www.mdpi.com/2072-4292/13/23/4791 |
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