how to get the uv information of a surface

Hello,guys!

I read a shape fron step file. Now the surface is explored. I need to drill some holes at the specified positions on the surface. Therefore I need to get the location information of points on the surface. It seems that the uv are generated, but I don't know whatis the relationship between uv and cartesian coordinates or natural coordinates. Could somebody help?

Best regards,
Qingsong