In the following web pages we describe how to compare SAR images from the ERS-2 satellite using interferometric methods in
order to determine relative ground deformation from a large surface rupturing earthquake (Hector Mine 10/16/199).
Table of Contents:
- Introduction and setup (this page)
- Building a DEM from SRTM data
- Retrieving SAR data from WInSAR
- Processing SAR pairs to build interferograms
- Create InSAR images using GMT
- Clean Up unnecessary files
- Appendix: Satellites available for InSAR
Some available sources of information Unfortunately, there is not yet a definitive source
ROI_PAC software
Data sources and misc.
Specific initializations:
Setting up parameters:
- This is done automatically for you once you switch to group MGM. If you are not using MGM (processing on
another system, doing non-class related processing, or are not in the MGM group), you will need to source the appropriate ROI_PAC config file. On our system, if you are using
the bash shell, you can simply type the following command
% source /usr/local/geophysics/ROI_PAC/SAR_CONFIG-gfortran_v3_1.txt
- Sourcing the above directories set a bunch of environmental variables as well as adding some ROI_PAC directories
to your path. You can test to see that you have configured ROI_PAC correctly by checking to see if the pertinent
variables are set correctly and that the path includes ROI_PAC:
% printf " $SAR\n $SAR_PRC_DIR\n $SAR_ODR_DIR\n $ROI_PAC\n $FFTW_LIB_DIR\n"
/usr/local/geophysics/ROI_PAC/ROI_PAC_3_1beta
/usr/local/geophysics/ROI_PAC/ORBITS/PRC
/usr/local/geophysics/ROI_PAC/ORBITS/ERS/Delft
/usr/local/geophysics/ROI_PAC/ROI_PAC_3_1beta/ROI_PAC
/usr/local/geophysics/ROI_PAC/ROI_PAC_3_1beta/ROI_PAC/NetInst/fftw-120221-1209/lib
# the following will check if your PATH is likely to be correctly set.
% printf "$MY_BIN\n $INT_BIN\n $INT_SCR\n"
/usr/local/geophysics/ROI_PAC/bin
/usr/local/geophysics/ROI_PAC/ROI_PAC_3_1beta/ROI_PAC/multibuild-120221-1214/installs/gfortran64/bin
/usr/local/geophysics/ROI_PAC/ROI_PAC_3_1beta/ROI_PAC/multibuild-120221-1214/installs/share/roi_pac
# the following will check if your PATH is likely to be correctly set.
% if echo $PATH | egrep ROI_PAC >/dev/null ; then
echo PATH looks good
else echo PATH needs to be set
fi
PATH looks good
If your output is similar to this, you are probably ready to start. Otherwise, if your output is either blank or only a fraction of this,
you will need to source the SAR_CONFIG file.
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