This plugin is now available under SNAP plugins. The SNAPHU Unwrapping plugin can be installed from Tools->Plugins->Available Plugins. The last version is 6.0.5.
Installation and usage instructions:
Choose the plugin, click “Install” and follow the installation procedure. Restart SNAP when SNAPHU Unwrapping installation is finished.
Once installed the plugin will be available under Radar->Interferometric->Unwrapping->Snaphu-unwrapping.
Note: When running SNAPHU Unwrapping tool for the first time the user will be noticed about the need to set up working path for the plugin. Click OK and proceed with bundle download/installation. After these steps the plugin will be ready use. On Linux, after the plugin installation, make sure to add the execute permission on snaphu script under $HOME/.snap/auxdata/snaphu-v1.4.2_linux/bin before starting to use the plugin.
Before unwrapping a product has to be exported using Snaphu Export (Radar->Interferometric->Unwrapping->Snaphu Export)
When the export is done the Snaphu Unwrapping can be executed (Radar->Interferometric->Unwrapping->Snaphu-unwrapping).
On the first tab, select the product previously exported with Snaphu Export (e.g. Phase.hdr). On the parameters tab select the output folder. In order to be able to open the unwrapped product, it is mandatory to select as an output folder the same folder where your exported files (e.g. phase.img, snaphu.conf etc.) are located. You can also check “Display execution output” in order to be able to view the log and the unwrapping execution progress. Then click “Run”.
After the phase is unwrapped it can be imported to SNAP for further analysis using Radar->Interferometric->Unwrapping-> SNAPHU Import (for using the unwrapped output product in SNAPHU Import, make sure to previously save it).
I hope it helps!