Contributed software
This is software that works with ROI_pac or adds to ROI_pac, written by the ROI_pac community. These programs are not in the released packages. Most or all of this software is open source, but the licensing is up to the individual authors.
Envisat ASAR ScanSAR package
This package is written by Cunren Liang and Justin Jia under the direction of Prof. Qiming Zeng from Institute of Remote Sensing and Geographic Information System, Peking University. It can process Envisat ASAR WS mode data. For more details, please go to: http://roipac.org/EnvisatScanSar.
- ALOS PALSAR raw data reading
ALOS_pre_processor and ALOS_merge by Rob Mellors and David Sandwell ALOS_preproc.tar.gz Note that you will need to install these executables to use make_raw_alos.pl in ROI_pac v.3.0. See PALSAR page and Rob's page for more details.
- Envisat ASAR long strip subsetting
This package contains some programs written by Howard Zebker with some modifications by Eric Fielding to determine the ground location of Envisat data from the satellite positions extracted from the DORIS orbit files. It also contains a slightly modified version of Sean Buckley's asa_im_decode program that can extract only a range of lines from an Envisat Level 0 (raw data) file. A Perl script make_raw_envi_subset.pl uses these programs to extract a subset of the raw data specified by a start and stop latitude. The accuracy is usually within a few hundred lines, and could be improved but it works fine for my purposes. Env-pass-cut.tgz (uploaded 10/10/2007 EJF)
Perl and matlab codes for reading output of ASF ALOS data searches and writing Google Earth output: ro_readers.tar
makedem.pl - Main perl script written by Noel Gourmelen download srtm tiles and output a DEM compatible for use with roi_pac based on geographic input. Uses GMT and matlab soft. See README file for environment variables and compilation setting. Updated 07Sep09.
get_SRTM.pl is a Perl script that works with the ROI_PAC software to create a ROI_PAC usable DEM dirctly downloading from the SRTM website. Usage: get_SRTM.pl filename minlat maxlat minlon maxlon byteswap; where filename is the output filename (must end with ".dem"); minlat, maxlat, minlon, maxlon, are decimal degrees, where West is negative (i.e., lons go from -180 to 180) byteswap is 1 if you want to byteswap the downloaded data (yes, if you're on our linux boxes). The lat/lon bounds can NOT cross the equator or prime meridian
A Perl script for converting ROI_pac "rmg" files (either .unw or .cor) to GMT grids. This is not very robust, but I find it useful. It works on geocoded and radar-geometry images. This should be installed in a MY_SCR directory (requires MY_SCR environment variable). rmg2grd.pl (uploaded 6/18/2008 EricFielding)
The SNAPHU program for phase unwrapping written by Curtis Chen SNAPHU page can be effective for some interferograms that don't unwrap well with the standard unwrapping tools in ROI_pac. A Perl script snaphu.pl to setup the SNAPHU input files from the ROI_pac files and run the program will be in the next release of ROI_pac.
A program roipac2grdfile by Walter Szeliga converts ROI_PAC output files to GMT compatible netCDF grid files
- It differs from the capabilities of xyz2grd and grdraster in that the output grid files contain multiple layers, i.e. converting a .unw file yields one GMT grid file with two layers, a magnitude and a phase layer. These separate layers are accessible from GMT programs by suffixing the grid file name with either ?phase or ?magnitude. For example, if one created a grid file named geo_010101-020101.grd, then the phase grid file would be accessible to grdinfo by typing
grdinfo geo_010101-020101.grd?phase
Other GMT commands use the same access method. roipac2grdfile-1.1.tar.gz (uploaded 2009/2/18)
Also, a small perl script to plot the GMT grid files created with roipac2grdfile. grd2pdf.pl (uploaded 2009/8/19)
University of Miami graduate student Scott Baker has written the getSAR package for automated data download which he is making available to the InSAR community: http://www.rsmas.miami.edu/personal/mbaker/getsar.html (or google getSAR). This package automates downloading data from the WInSAR archive and ASF L1 Data Pool, so you have to have accounts with those providers.
Cornell University has released a python script to create dense sub-pixel offset tracking of SAR and optical images available here
Cornell University has released a set of matlab scripts that read ROI_PAC output files in a range of coordinates. ro_loaders.tar
One more Cornell utility - reads .proc file and generates pretty GMT file based on DEM used to make interferogram. DEM must COMPLETELY contain interferogram, or it dies. Can also perform over a subregion of interferogram. plot_insar_gmt.pl More "flexible" version that allows you to specify path to geocoded file and DEM instead of reading from .proc file: plot_insar_gmt_flex.pl
Marie-Pierre Doin has modified the programs to read the "Envisat-type" format ERS data. There is a new program "new_parse_ers.c" and Perl script "make_raw_ers.pl" uploaded on the ERS page. This new code is "beta" so please let us know if you make further improvements.
Is your interferogram (particularly from ALOS) only coherent for a narrow strip down the center of the image? If so, you might need a substitute for ROI_PAC's "fitoff" routine, which will perform a quadratic fit instead of only a planar fit. Vivian Lin has translated Rowena Lohman's "newfitoff.m" to python, posted here: newfitoff.py (uploaded 2010/08/16). The script requires the "scipy" package for Python. The "matplotlib" package for python is required for plotting. Plotting is currently commented out. Please have the "matplotlib" package installed if uncommenting the plotting routines.