IMAGENEX DT101Xi, Technical Manual

Page: 23 / 64

Doc no: 430-041-01 23 of 64
4.2.1. Latency
Coincident lines of approximately 100 m are run at different speeds (4 knots and 8 knots) over a sloping
terrain or a conspicuous topographic feature.
Figure 4-1
Latency lines
Lines must be run in the same direction, in order to eliminate the effect of a potential pitch offset, which
would leak into the along-track displacements. With lines run in the same direction, the time delay can be
computed using the equation Eq 14:
𝑇𝐷 =
𝑑
𝑎
(𝑣
ℎ
− 𝑣
𝑙
)
(Eq 14)
Where:
TD = is the time delay (s)
d
a
= along track displacement (m)
v
h
is the higher speed (m/s)
v
1
is the lower speed (m/s)
Slow
Fast