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| Citation: | Qin Xiaofang, Zhang Huachun, Zhang Heng, Wang Yu, Liu Huayou. A High Precision DEM Generation Method Based on Ascending and Descending Pass TerraSAR-X/TanDEM-X BiSAR Data[J]. Journal of Radars, 2018, 7(4): 487-497. doi: 10.12000/JR18022
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A High Precision DEM Generation Method Based on Ascending and Descending Pass TerraSAR-X/TanDEM-X BiSAR Data
doi: 10.12000/JR18022
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Abstract
A method for fine resolution and high precision Digital Elevation Model (DEM) generation using ascending and descending pass TerraSAR-X/TanDEM-X (TSX/TDX) datasets is proposed in this study. First, the NonLocal Interferometric SAR (NL-InSAR) can effectively generate ascending and descending pass raw DEMs. On this basis, the coherence well recovered by NL-InSAR is used to fusion the raw DEMs to further improve the accuracy and reduce the invalids caused by layover and shadows. This method was used to process the TSX/TDX data obtained in Beijing. The number of invalid points of DEM after fusion decreased significantly. Statistics result shows that it decreased from 4.93% in ascending raw DEM and 4.52% in descending raw DEM to 1.34% in the fusion DEM. At the same time, the accuracy of the fusion DEM increased by 9.6% compared to 6.67 m in the descending raw DEM and 8.7% compared to 6.74 m in the ascending raw DEM, reaching 6.09 m. -
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References
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- Figure 1. Non-local filtering
- Figure 2. Coherence estimates
- Figure 3. Geometric distortion of SAR image
- Figure 4. Sketch map of ascending and descending
- Figure 5. Preprocessing of ascending and descending raw DEMs
- Figure 6. Flow chart of ascending and descending raw DEMs
- Figure 7. the bistatic mode and the research area
- Figure 8. Contrast of different filters
- Figure 9. Coherence by different filters
- Figure 10. DEM contrast by different methods
- Figure 11. Ascending and descending pass raw DEM (Overlaid red boundary is the common arear between two datasets)
- Figure 12. Fusion DEM of ascending and descending pass (City)
- Figure 13. Fusion DEM of ascending and descending pass (Hill)