7. CONCLUSIONS 
The first indications from the estimation work reported 
here, are that GPS antenna coordinates will be beneficial 
to this high precision application. Such simulation 
analysis is an important part of photogrammetric 
development. However, practical experience gained 
through a full flight trial, is most valuable. Of course, there 
is also the need to test the integrated Nottingham system 
in true flight conditions. Using knowledge gained from the 
simulation work, a full flight trial is near to execution. It is 
hoped that the results from this work will validate the KE 
simulations and quantify the operational degredation of 
system precision. AR 
9. ACKNOWLEDGEMENTS Al 
SEC 
poi 
The authors would like to acknowledge the support of The 
University of Nottingham and the United Kingdom hig 
. : . 2 : Be 
Engineering and Physical Sciences Research Council he 
(EPSRC). Also, the assistance of Dr W. Chen of the E 
IESSG and Mr J.C. Boardman of Photarc Surveys for 
Limited. is | 
lin 
10. REFERENCES 
Boardman J.C., 1994, High precision levelling of 
motorways by low level helicopter survey. Ex 
Photogrammetric Record 14(84). ati 
he 
Hansen P. and Joy C.I.H., 1995 High Precision Highway " 
Profiles using Helicopter Borne 'On-The-Fly' GPS. Paper sat 
presented at the 8th International Technical Meeting of 
The Satellite Division of The Institute of Navigation, Palm int 
Springs, California 12-15 Sept. 1995. COI 
Jec 
Smith M.J. and Joy C.LH, 1995a Preliminary pui 
investigations into developments in using helicopter thi: 
photography for highway surveying. Photogrammetric ela 
Record 15(85). scl 
(Fi 
Smith M.J. and Joy C.I.H., 1995b Developments in an car 
integrated in-flight positioning and orientation system for 
helicopter photography. Paper presented at the ISPRS- ed 
FIG Joint Workshop "Integrated Sensor Orientation: In 
Theory, Algorithms and Systems", Barcelona 4-8 Sept. pix 
1995. pei 
det 
Smith M.J., Joy C.I.H, Boardman J.C., 1996. The use of ea 
helicopter photography for highway surveying. Paper res 
presented at the ASPRS/ASCM Conference, Baltimore thi 
Maryland April 1996. the 
ate 
wi 
ter 
col 
an 
cal 
Orc 
are 
sq 
ac 
Th 
820 
International Archives of Photogrammetry and Remote Sensing. Vol. XXXI, Part B3. Vienna 1996