PE&RS July 2019 - page 489

(a)
(b)
(c)
(d)
Figure 7. The positional difference comparisons between
two neighboring subarea DOMs before (upper two) and after
(lower two) the image registration process based on the TPS
model. Subfigures (a) and (c) are from the overlapping area
of Parts 1 and 2, and (b) and (d) are from the overlapping
area of Parts 9 and 10.
Figure 8. Check points (green circles) between Parts 1 and 2
subarea DOM mosaics for precision evaluation of the TPS-based
image registration. The red polygon is the border of Part 1, the
blue polygon is the border of Part 2, and the yellow rectangle
shows part of the planned landing area of Chang’e-5.
Table 4. TPS-based DOM registration precision between Part 1
and Part 2 subarea DOM mosaics (1.5 m/pixel). “Lat Diff” and
“Long Diff” represent the coordinate differences in latitude and
longitude directions, respectively; “chk” represents check point.
Chk ID
Before DOM Registration (m) After DOM Registration (m)
Long
Diff
Lat
Diff
Planar
Diff
Long
Diff
Lat
Diff
Planar
Diff
chk1 4.69 −14.30 15.05 1.62 −1.26 2.05
chk2 15.72 −15.87 22.34 0.42 −0.61 0.74
chk3 −11.05 −21.96 24.58 0.96 −0.56 1.11
chk4 11.68 −16.57 20.27 −1.58 −2.17 2.69
chk5 −4.29 17.76 18.27 1.13 0.79 1.38
chk6 4.56 24.05 24.48 0.00 −1.20 1.20
chk7 −10.15 29.91 31.58 0.22 0.39 0.45
chk8 6.08 32.38 32.94 0.66 0.37 0.75
chk9 15.63 10.85 19.02 −0.37 1.26 1.32
chk10 6.08 −9.95 11.66 −0.78 0.42 0.88
PHOTOGRAMMETRIC ENGINEERING & REMOTE SENSING July 2019 489