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Amplitude calibration module

This module estimates a calibration constant using the amplitude information for each SLC in a stack. The stack is expected to be provided as a GDAL VRT file. The Metadata section of the input GDAL VRT is updated with an amplitude calibration constant.

Algorithm

The mask dataset is an optional input and is often used to mask out water in the image. The mask dataset is interpreted as zero/ non-zero.

calamp equation

References

  1. Lyons, S. and Sandwell, D., 2003. Fault creep along the southern San Andreas from interferometric synthetic aperture radar, permanent scatterers, and stacking. Journal of Geophysical Research: Solid Earth, 108(B1).

  2. Hooper, A. et al., 2009-2013. StaMPS software. https://homepages.see.leeds.ac.uk/~earahoo/stamps/ .

calamp.py

Python-based script that uses Cython-bound version of calamp. Python-based executable will always have more error checking and better handling of optional inputs.

usage: calamp.py [-h] -i INPUTDS -o OUTPUTDS [-m MASKDS] [-d DEFAULTVALUE]
                 [-l LINESPERBLOCK] [-r MEMORYSIZE] [-s]

Compute amplitude calibration using magnitude of SLCs

optional arguments:
  -h, --help            show this help message and exit
  -i INPUTDS, --input INPUTDS
                        Input GDAL SLC stack VRT (default: None)
  -o OUTPUTDS, --output OUTPUTDS
                        Output GDAL SLC stack VRT (default: None)
  -m MASKDS, --mask MASKDS
                        Mask DS to use for masking out water / other areas for
                        estimating calibration constant. (default: )
  -d DEFAULTVALUE, --default DEFAULTVALUE
                        Default value to assign to mask if a constant cannot
                        be computed (default: 1.0)
  -l LINESPERBLOCK, --linesperblock LINESPERBLOCK
                        Quantum for block of lines (default: 64)
  -r MEMORYSIZE, --ram MEMORYSIZE
                        Memory in Mb to use (default: 256)
  -s, --sqrt            Apply sqrt explicitly to the amplitudes (default:
                        False)

calamp

C++ based executable. Not much error checking of inputs.

  calamp {OPTIONS}

    Amplitude calibration using magnitudes of SLCS.

  OPTIONS:

      -h, --help                        Display this help menu
      -i[inputDS*]                      Input Stack VRT
      -o[outputDS*]                     Output Stack VRT
      -m[maskDS]                        Mask dataset
      -l[linesperblock]                 Lines to load per block
      -r[memoryinMb]                    Memory to use in Mb
      -n[defaultValue]                  Default norm