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Purpose

 

This functionality enables to obtain information about both the baseline values and the doppler centroid difference and the acquisition time distance in a multi-temporal SAR acquisitions series. The values for all possible interferometric pair combinations are calculated.

 

The extracted values have to be intended as approximate measurements aimed at a preliminary data characterisation and interferometric quality assessment. The baseline value itself is not used in any part of the Interferometric processing chain.

 

Technical Note

 

The generation of an interferogram is only possible when the ground reflectivity acquired with at least two antennae overlap. When the perpendicular component of the baseline (Bn) increases beyond a limit known as the critical baseline, no phase information is preserved, coherence is lost, and interferometry is not possible. The critical normal baseline Bn,cr, can be calculated as:

 

                   Bn,cr = λ R tan(θ)

              2 Rr

 

where λ is the wavelength, R is the range distance, Rr is the pixel spacing in range, and θ is the incidence angle. Note that the critical baseline can be significantly reduced by the topography.

 

Input Files

 

Input File List

List of data files (_pwr for ScanSAR products; _slc or _pwr for all the others). This file list is mandatory.

 

Output Files

 

Output Root Name

Name of the output root. This file is mandatory.

 

The normal baseline values, as well as the acquisition time distance (in days) and the doppler centroid difference, are provided on a pop-up screen.

 

.xls, .txt, .csv

The information provided on screen are stored in two different formats.

 

General Functions

 

Exec

The processing step is executed.

 

Store Batch        

The processing step is stored in the batch list. The Batch Browser button allows to load the batch processing list.

 

Close        

The window will be closed.

 

Help

Specific help document section.

 

 

Specific Function(s)

 

None.        

 

See Also

 

Task, SARscapeBatch object, SARscapeBatch script example

 

References

 

F. Holecz, P. Pasquali, J. Moreira, E. Meier, D. Nüesch: "Automatic Generation and Quality Assessment of Digital Surface Models generated from AeS-1 InSAR data". Proceedings of European Conference on Synthetic Aperture Radar, Friedrichshafen, Gemany, May 1998.

 

D. Small, P. Pasquali, S. Fuglistaler:  "A Comparison of Phase to Height Conversion Methods for SAR Interferometry".

 

Wolfgang Goblirsch, P. Pasquali:  "Algorithms for Calculation of Digital Surface Models from the Unwrapped Interferometric Phase". Proceedings of International Geoscience and Remote Sensing Symposium (IGARSS'96). Lincoln, Nebraskq USA. May 27-31.1996.