Volume XLII-5
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-5, 207–209, 2018
https://doi.org/10.5194/isprs-archives-XLII-5-207-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XLII-5, 207–209, 2018
https://doi.org/10.5194/isprs-archives-XLII-5-207-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

  19 Nov 2018

19 Nov 2018

ANALYSIS OF PERFORMANCE OF FLAT EARTH PHASE REMOVAL METHODS

K. Desai1, P. Joshi1, S. Chirakkal2, D. Putrevu2, and R. Ghosh1 K. Desai et al.
  • 1Dhirubhai Ambani Institute of Information and Communication Technology, Gujarat, India
  • 2Microwave Techniques Development Division, SAC, ISRO, Ahmedabad, India

Keywords: Flat-earth effect, interferometric synthetic aperture (InSAR), Polynomial Fitting, Precise Orbit

Abstract. Interferometric synthetic aperture radar (InSAR) has been widely used in remote sensing field, which can reflect actual topographic trend or possible surface deformation. Due to the orbit attitude influence, the flat-earth phase usually causes the interferogram dense and difficult to be used in further procedures. Before phase unwrapping, interferogram must be flattened to derive accurate topographic or deformation information. In this paper, analysis of performance of two methods of flat-earth removal is done. First method uses imaging geometry and second method uses precise orbital information. Further, 3-degree, 5-degree and 7-degree polynomials are fitted in the method using precise orbital information. Validation is done both visually and empirically using entropy as the evaluation index.