Large-scale TanDEM-X InSAR sub-canopy topography inversion under insufficient observation information

doi:10.11947/j.AGCS.2024.20230004

Abstract

Abstract:

The TerraSAR/TanDEM-X InSAR system is currently one of the most important global mapping satellite systems, the data acquired by this system is mainly single-baseline, single-polarized SAR data. Restricted by insufficient observation information, vegetation, and surface scattering information cannot be directly separated from the data, which makes it hard to apply the system to the large-scale, high-precision inversion of terrain under forest. Therefore, this article proposes a method for large-scale terrain inversion under forest using single/dual baseline observations. The core concept of this method is as follows: for overlapping zones (dual baseline observation), the RVoG model is used to estimate the terrain under forest and the forest height; for non-overlapping zones (single baseline observation), with the estimated tree height of the overlapping zone as the prior information, a simplified RVoG model (C-SINC) is used to estimate the terrain under forest. The new method was analyzed and verified in the Teruel experimental zone of Spain. Comparing the results with LiDAR DEM, the RMSE of sub-canopy topography acquired by this method is 5.98 m, which is 20% higher in precision than the RMSE of 7.43 m obtained by InSAR DEM. For large-scale areas, the new method provides a reference for the application of TanDEM-X to estimate the sub-canopy Topography.

Key words: sub-canopy topography, single/dual baseline InSAR, large-scale topography inversion, interferometric pairs

CLC Number:

P237

Jun ZHU, Wei PENG, Haiqiang FU, Man OU, Shancheng LEI, Shiping ZHANG. Large-scale TanDEM-X InSAR sub-canopy topography inversion under insufficient observation information[J]. Acta Geodaetica et Cartographica Sinica, 2024, 53(5): 959-966.

Figures/Tables 7

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影像获取日期	数据编号	入射角/(°)	垂直基线/m	垂直有效波数/(rad/m)	高程模糊度/m
2012-10-23	1	33.09	181.9	0.19	33
2012-10-23	2	33.09	181.5	0.19	33
2011-12-20	3	36.12	104.9	0.11	57
2011-12-20	4	36.12	105.0	0.11	57

数据	所有区域	重叠区	非重叠区
InSAR DEM	7.43	7.31	7.64
林下地形	5.98	5.72	6.09