International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Vol XXXV, Part B3. Istanbul 2004
3.3 Cross Strips
Based on multi-strip test two cross strips were added into the
block for these strategies test:
e Different section number
e Different GCP number
€ Different GCP configuration
Total 66 GCPs, 1189 pass points and tie points were measured in
semi-auto matching method. Table 5 and 6 list the obtained
results in different subsection length and different GCP number.
Section RMS X (m) | RMS Y (m) RMS Z
Length (m)
om 0.064 0.08 0.168
30000 0.073 0.095 0.181
40000 0.079 0.116 0.173
0000 0.075 0.123 0.164
100009 0.156 0.184 0.228
be 0.221 0.193 0.238
Table 5. Statistics associated with different section number.
From this table we find the shorter the subsection, the more
accurate the results.
GCP RMS X(m) | RMS Y (m) RMS Z
Number (m)
2 GCP A 0.112 0.1401 0.187
2 GCP B 0.095 0.145 0.166
2:GCP C 0.107 0.136 0.226
3 GCP A 0.127 0.144 0.193
S GCPB 0.105 0.181 0.1901
4 GCP 0.106 0.135 0.199
S:GCP 0.097 0.154 0.183
6 GCP 0.102 0.134 0.193
8 GCP 0.095 0.145 0.166
H GEP 0.107 0.126 0.198
12-GCP 0.0907 0.124 0.217
All GCP 0.073 0.095 0.181
Table 6. Statistics associated with different GCP number.
From this table we find the more the GCPs in same subsection
length, the more accurate the results.
Comparing Table 3 with 5 and Table 4 with 6 we also find even
though the number of GCPs, pass points and tie points are same,
the accuracy of planimetry and height for cross strips have
been improved considerably due to the geometric conditions
have been strengthened.
4 Conclusion
The growing demand for fast and accurate data acquisition for
mapping and GIS applications requires the provision of new
sensors with a high automatic mapping potential as the digital
photogrammetry has been widely used to produce various digital
mapping data and orthoimages in last decade years. Airborne
TLS imaging system has proven the concept of stereo and multi
spectral mapping using three-linear pushbroom CCD arrays
since 2D CCD array imaging systems with a comparable size
and resolution have not been available presently and are not
likely to be available in the future. However, these image data
collected by the TLS imaging system can only be useful if the
geometric relationship between pixels in the images and their
corresponding locations on the ground is known. Thus, the
determination of the exterior orientation parameters of these
time-dependent linear images is the most important problem to
be solved firstly. In this paper we provided several orientation
strategies to improve the accuracy of point determination with
minimum number ground control points. These strategies have
been practically applied in STARIMAGER.
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