Controlled airspace typically begins 700 AGL or 1200 AGL. Assume ATC instructs you " turn to heading 360 upon entering controlled airspace". Given this clearance, assume my departure airport is (Class G) and controlled airspace begins 1200 AGL. After departure and once I reach 1200 AGL I do turn to heading 360. Does entering controlled airspace at 1200AGL in this case imply that ATC can see me on radar and also allows for proper obstacle/terrain clearance? Is it possible to be below radar coverage yet I can still turn to 360 at 1200 AGL and have proper obstacle/terrain clearance?