How to generate a GHZ file?

I’m using graphhopper 1.0 to build android offline navigation and I have a PBF file but don’t know how to convert it to a ghz file

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A ghz file is just a zipped -gh folder. So you need to follow the standard procedure of importing your pbf file using GraphHopper and zip the folder that will be created. Depending on your configuration it will be graph-cache, or your-map-file-name-gh or anything you specified under graph.location in config.yml.