Creating routing file

[karussell]

What is a ghz file, can we create our own if GH does not host our country?

The ghz files on the Graphhopper site at download2.graphhopper.com/public/maps/0.13 do not include maps for New Zealand. I’m trying https://download2.graphhopper.com/public/maps/0.13/oceania/new_zealand.ghz What is a ghz file, is it just a zip of the osm file, can I make my own and then host it somewhere so I can download ? I’m using this with the offline VTM grapphopper demo found here https://github.com/graphhopper/graphhopper/blob/master/android/README.md