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ROI_pac

ROI_pac. Valerie Sahakian Laura Sumiejski SIO 239 02/19/2010. What the heck is ROI_pac ?. Takes data Gets offsets from 2 single-look complex (SLC) images Fits 2 nd order polynomial to offsets Resample SLC images (dates) Multiply complex pixels of images. Gets amplitudes. But ….

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ROI_pac

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  1. ROI_pac Valerie Sahakian Laura Sumiejski SIO 239 02/19/2010

  2. What the heck is ROI_pac? • Takes data • Gets offsets from 2 single-look complex (SLC) images • Fits 2nd order polynomial to offsets • Resample SLC images (dates) • Multiply complex pixels of images Gets amplitudes

  3. But… • Amplitudes form raw interferogram • Topography • Atmosphere • Orbit • Deformation • Etc.

  4. Refine Model • Removes phase from orbit geometry • Begins flattening • Calculate correlation between 2 scenes • Removes topography • Calculates and removes phase from DEM • Subtract models from seismic interferogram • Filter noise, mask (phase variance), unwrap, etc.

  5. Refine Model cont. • Re-estimate baseline • Use topography to refine • Geocoding • Unwrapped phase • Change coordinates over to geographical coordinates to match DEM

  6. Directory Hierarchy • Data Directory • Data • Run Directory • Copies of data • .proc file • DEM directory • DEM

  7. Choose a Location! • Use EOLi • Earth Observation Link from the European Space Agency • For our example we chose an area in Southern California • 35.6° N and 120.28° W • (about 36°36’ latitude and -120°18’ longitude)

  8. Track 256 • Frame 2889 • Date 1: Nov. 10, 1992 • Date 2: May 17, 1996

  9. Get the Data • WInSAR • Western North America InSAR Consortium • Data for western US • Members only • Data on WInSAR • Data downloadable from GeoEarthScope and Supersites

  10. Inputs for ROI_pac: Raw Data • For ERS1 and ERS2 • Assign master and slave • Master = SARLEADER • Slave = IMAGERY • Note: these files should have the date appended to the end with the time stamp • make_raw.pl • Outputs: • Raw data: date.raw • Metadata for raw data: date.raw.rsc • Reformatted orbit data: hdr_data_points_date.rsc

  11. Inputs for ROI_pac: Parameters • DEM • Digital Elevation Model • SRTM data • Mosaic_srtm.pl –Rw/e/s/nmagic.DEM • Process File (.proc) • Int_date2_date1.proc • Radar acquisition dates • Pathname for magic.DEM

  12. But… • On sioprism.ucsd.edu • /data/ERS1/track/frame/orbit/ • /data/ERS2/track/frame/orbit/ • ERS2_track_frame_orbit.zip • Copy desired data to your directory • Run ers2roi.pl • Unzips files • Includes make_raw.pl • Makes master and slave files • Makes .proc file

  13. Baseline • Run base_roi.pl • Acceptable baseline pairs • Perpendicular and parallel baselines • Etc. • Note: edit path for DEM in .proc file

  14. process_2pass.pl • Run <process_2pass.pl int_date2_date1.proc> • Wait ~ 1 hour • Magic happens! • To see interferogram • int_date2_date1/flat/ (from after flattening) • <mdx.plfile.unw> • Note: make sure you ssh using –X or -Y

  15. Success! (sort of)

  16. References • University of Oregon, WikiRoiPac. http://www.uoregon.edu/~das/WikiRoiPac/doku.php?id=welcome • Fielding, Eric. ROI_pac Internals: Under the Hood, UNAVCO InSARshortcourse. August 2009.

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