Terrain-Guided Block Adjustment for InSAR DSM Elevation Calibration
The block adjustment of interferometric synthetic aperture radar (InSAR) digital surface model (DSM) is a crucial step in elevation calibration. Local slope and aspect can directly affect the occurrence of geometric distortions in InSAR DSM, such as foreshortening, shadow, and layover, severely decr...
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IEEE
2025-01-01
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| Series: | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
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| Online Access: | https://ieeexplore.ieee.org/document/10989579/ |
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| author | Chenglong Cao Zhiwei Li Liqun Liu Mi Jiang |
| author_facet | Chenglong Cao Zhiwei Li Liqun Liu Mi Jiang |
| author_sort | Chenglong Cao |
| collection | DOAJ |
| description | The block adjustment of interferometric synthetic aperture radar (InSAR) digital surface model (DSM) is a crucial step in elevation calibration. Local slope and aspect can directly affect the occurrence of geometric distortions in InSAR DSM, such as foreshortening, shadow, and layover, severely decreasing elevation accuracy. Planimetric geolocation errors can lead to larger elevation errors, particularly in areas with significant terrain variation. Therefore, this study proposes a block adjustment method that considers local terrain information. First, terrain information such as slope and aspect are introduced into the construction of the elevation error model. Next, the new model is used to construct the error equation in block adjustment and the least squares method is used to solve the parameters and correct the elevation. Finally, twelve pairs of TanDEM-X coregistered single-look slant range complex images covering an area of approximately 1° × 1° in Guangdong, China, are used for experimental validation. Filtered Ice, Cloud, and land Elevation Satellite-2 points are used as ground control points and checkpoints, whereas Copernicus DSM30 is used for qualitative assessment. The results indicate that 1) the root mean square error of the adjusted DSMs elevation error decreases from 3.09 to 2.60 m after the introduction of the terrain information, resulting in an improvement in accuracy of approximately 15%. 2) The new method that considers terrain information outperforms the traditional polynomial model across different slope ranges. These results demonstrate the superiority of the proposed method. |
| format | Article |
| id | doaj-art-3c4ccb0e791c461199001fa97f8d986d |
| institution | DOAJ |
| issn | 1939-1404 2151-1535 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing |
| spelling | doaj-art-3c4ccb0e791c461199001fa97f8d986d2025-08-20T03:12:27ZengIEEEIEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing1939-14042151-15352025-01-0118125011251010.1109/JSTARS.2025.356726310989579Terrain-Guided Block Adjustment for InSAR DSM Elevation CalibrationChenglong Cao0https://orcid.org/0009-0006-6940-3643Zhiwei Li1https://orcid.org/0000-0003-4575-5258Liqun Liu2https://orcid.org/0000-0001-9898-7103Mi Jiang3https://orcid.org/0000-0003-2459-4619School of Geosciences and Info-Physics, Central South University, Changsha, ChinaSchool of Geosciences and Info-Physics, Central South University, Changsha, ChinaSchool of Geosciences and Info-Physics, Central South University, Changsha, ChinaSchool of Geospatial Engineering and Science, Sun Yat-Sen University, Guangzhou, ChinaThe block adjustment of interferometric synthetic aperture radar (InSAR) digital surface model (DSM) is a crucial step in elevation calibration. Local slope and aspect can directly affect the occurrence of geometric distortions in InSAR DSM, such as foreshortening, shadow, and layover, severely decreasing elevation accuracy. Planimetric geolocation errors can lead to larger elevation errors, particularly in areas with significant terrain variation. Therefore, this study proposes a block adjustment method that considers local terrain information. First, terrain information such as slope and aspect are introduced into the construction of the elevation error model. Next, the new model is used to construct the error equation in block adjustment and the least squares method is used to solve the parameters and correct the elevation. Finally, twelve pairs of TanDEM-X coregistered single-look slant range complex images covering an area of approximately 1° × 1° in Guangdong, China, are used for experimental validation. Filtered Ice, Cloud, and land Elevation Satellite-2 points are used as ground control points and checkpoints, whereas Copernicus DSM30 is used for qualitative assessment. The results indicate that 1) the root mean square error of the adjusted DSMs elevation error decreases from 3.09 to 2.60 m after the introduction of the terrain information, resulting in an improvement in accuracy of approximately 15%. 2) The new method that considers terrain information outperforms the traditional polynomial model across different slope ranges. These results demonstrate the superiority of the proposed method.https://ieeexplore.ieee.org/document/10989579/Block adjustmentelevation error modelinterferometric synthetic aperture radar (InSAR) digital surface model (DSM)local terrain information |
| spellingShingle | Chenglong Cao Zhiwei Li Liqun Liu Mi Jiang Terrain-Guided Block Adjustment for InSAR DSM Elevation Calibration IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing Block adjustment elevation error model interferometric synthetic aperture radar (InSAR) digital surface model (DSM) local terrain information |
| title | Terrain-Guided Block Adjustment for InSAR DSM Elevation Calibration |
| title_full | Terrain-Guided Block Adjustment for InSAR DSM Elevation Calibration |
| title_fullStr | Terrain-Guided Block Adjustment for InSAR DSM Elevation Calibration |
| title_full_unstemmed | Terrain-Guided Block Adjustment for InSAR DSM Elevation Calibration |
| title_short | Terrain-Guided Block Adjustment for InSAR DSM Elevation Calibration |
| title_sort | terrain guided block adjustment for insar dsm elevation calibration |
| topic | Block adjustment elevation error model interferometric synthetic aperture radar (InSAR) digital surface model (DSM) local terrain information |
| url | https://ieeexplore.ieee.org/document/10989579/ |
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