{HEAD ~ Reference terrain altitude maps} are converted by a reference map transformation to data which correlates the reference map to the altitude of {TAIL ~ the missile} 
{ HEAD ~ Reference terrain altitude maps } are converted by a reference map transformation to data which correlates the reference map to the altitude of { TAIL ~ the missile }
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL