Terrain topographic inversion using single-pass polarimetric SAR image data
- 77 Downloads
The shift of polarization orientation angleΨ at the maximum of co-polarized or cross-polarized back-scattering signature can be used to estimate the surface slopes. It has been utilized to generate the digital elevation mapping (DEM) and terrain topography using two-pass fully polarimetric SAR or interferometric SAR (INSAR) image data. This paper presents an approach to DEM inversion by using a single pass of polarimetric SAR data. TheΨ shift is derived, by using the Mueller matrix solution, as a function of three Stokes parameters,I vs, Ihs, Us, which are measured by the SAR polarimetry. Using the Euler angles transformation, the orientation angleΨ is related to both the range and azimuth angles of the tilted surface and radar viewing geometry, as has been discussed by many authors. When only a single-pass SAR data is available, the adaptive thresholding method and image morphological thinning algorithm for linear textures are proposed to first determine the azimuth angle. Then, making use of full multi-grid algorithm, both the range and azimuth angles are utilized to solve the Poisson equation of DEM to produce the terrain topography.
Keywordssingle pass fully polarimetric Stokes parameters shift azimuth and range angles terrain topography DEM
- 1.Jin, Y. Q., Electromagnetic Scattering Modelling for Quantitative Remote Sensing, Singapore: World Scientific, 1994.Google Scholar
- 6.Castleman, K. R., Digital Image Processing, New York: Prentice Hall, 1996.Google Scholar
- 7.Chan, F. H. Y., Lam, F. K., Zhu Hui, Adaptive thresholding by variational method, IEEE Transaction on Geoscience Remote Sensing, 1998, 7(3): 468–473.Google Scholar
- 13.China Integrative Atlas, Beijing: China Map Publishing Company, 1990, 151.Google Scholar