Azimuth Offsets (δ)
Elevation
Angle (°)
Col 1
+4.2°
Col 2
+1.4°
Col 3
-1.4°
Col 4
-4.2°
4.667 26
3.333 21
2.333 22
1.667 17
1.333 13
1.000 18
0.667 14
0.333 9
0.000 5
-0.333 10
-0.667 6
-1.000 1
-1.333 31
-1.667 2
-2.000 28
-2.333 27
-2.667 23
-3.000 24
-3.333 20
-3.667 19
-4.000 15
-4.667 16
-5.333 12
-6.148 11
-7.254 8
-8.843 7
-11.310 4
-15.639 3
-25.000 0
To get better precision when geo-referencing, it’s useful to precisely calculate the unique azimuth for each point by
accounting for the firing timing. These precision azimuths may be calculated/interpolated using the timing offsets shown in
Figure 9-7 on page 65
and
Figure 9-8 on the previous page
.
Consider a single data packet with 12 data blocks. The azimuth given at the beginning of each data block represents the
azimuth reported at the moment the first pair of lasers in the block fire. If you assume the rotational speed is constant over
Chapter 9 • Sensor Data 67
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