Phase Filtering and Unwrapping
SNAPHU
One option for phase unwrapping is to use the SNAPHU (Statistical-cost, Network-flow Algorithm for PHase Unwrapping) program developed by Curtis Chen when he was a student at Stanford. The program source code is available from the Stanford website http://www-star.stanford.edu/sar_group/snaphu/ . Note that the v1.4.2 source code may have problems if it is compiled in 64-bit mode, so you may need to use the "-m32" flag in compiling it.
ROI_pac version 3.0.1 (and higher) has Perl scripts that can run the SNAPHU program, including "snaphu.pl". You will need to set the environment variable MY_BIN to the directory where you have installed the "snaphu" executable program. The new "process_2pass_master.pl" processing script supports "unw_method=snaphu" and "unw_method=snaphu_mcf" specifications in the "int.proc" file.
