Table 2.--Comparisons of profiles at crossings 
  
  
  
ELEVATION 
PROFILES DIFFERENCE EXPLANATION RESOLUTION 
(FEET) 
A1-B2 vs. A2-B1 2.61 Short lock on B1 Adjusted A2-B1 
A2-B3 vs. A3-B2 10 
A3-B4 vs. A4-B3 4,60 No lock on B4 Adjusted A3-B4 
A4-B5 vs. A5-B4 .60 
B1-C2 vs. B2-C1 ‚42 
B2-C3 vs. B3-C2 ‚79 Adjusted each .4 foot 
B3-C4 vs. B4-C3 .85 Adjusted each .42 foot 
Cl-D2 vs. C2-D1 3.90 Unexplained Adjusted each 1.95 foot 
C2-D3 vs. C3-D2 .85 Adjusted each .42 foot 
C4-D5 vs. C5-D4 1.10 Uncertainty in ele- Adjusted C4-DS 
vation of DS 
C5-D6 vs. C6-D5 «T1 
D1-E2 vs. D2-El „36 
D2-E3 vs. D3-E2 1.38 Adjusted each .69 foot 
D3-E4 vs. D4-E3 ‚51 
El-F2 vs. E2-F1 1.72 No lock on E1 Adjusted E1-F2 
E2-F3 vs. E3-F2 . 14 
E3-F4 vs. E4-F3 4.16 No lock on E4 Adjusted E4-F3 
E4-F5 vs. ES-F4 ren Terrain too rough 
for comparison 
E5-F6 vs. E6-F5 2.17 Uncertainty in ele- Adjusted E6-F5 
vation of F5 
Fl-G2 vs. F2-G1 15 No lock on F2 Adjusted F2-G1 
F2-G3 vs. F3-G2 1.97 Adjusted each 1 foot 
F3-G4 vs. F4-G3 .67 
F4-G5 vs. F5-G4 1.30 Uncertainty in ele- Adjusted F5-G4 
vation of F5 
F6-G7 vs. F7-G6 .99 Adjusted each .5 foot 
Gl-H2 vs. G2-H1 1.28 Adjusted each .6 foot 
G2-H3 vs. G3-H2 1.63 Adjusted each .8 foot 
G3-H4 vs. G4-H3 05 
G5-H6 vs. G6-H5 .88 Adjusted each .4 foot 
G6-H7 vs. G7-H6 +10 
H1-J2 vs. H2-J1 ‚14 
H2-J3 vs. H3-J2 ‚66 
  
capability would be developed for the laser profiler to improve the ground 
elevation gathering capabilities from a line of elevation data to a swath. 
The laser tracker design would need to be modified to fit the IMU and more 
precise angular resolvers would be needed in the new IMU. The APTS II 
envisioned could be installed in a much smaller aircraft, such as an Aero 
Commander, operated with a two-man crew, and provide better data for 
creating digital terrain models than the prototype system, and cost much 
less to operate. 
The fabrication of an APTS II will allow the utilization of the existing 
APTS instrument for further research. Two areas of research appear 
promising: developing a gravity modeling capability and a large-scale 
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