Doing Golf course mapping in iPhone

I am doing one golf gps app for iPhone. For that I need to show the golf course map on the iPhone device. I searched about that in the internet. There are lot of methods and service providers for doing that golf course mapping(aerial image). For your reference : http://sites.google.com/site/mapmakerpedia/maps-101/how-to-map-a-golf-course Somebody says that we can use google imagery for that. But my question is
1. How we could bring that golf course map data into iPhone app?
2. Is there any API or method available for that?
3. In which format, that golf course map data file will be?
Thanks!

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