1. VisionMap A3 Quasi-Panoramic Model Implementation in Photomod 5.0
Racurs 2010

2. A3 - Aerial Photogrammetric System
Aerial Survey Digital Large Frame Camera
Ground Processing System

3. Visionmap A3 Differentiators
Very High productivity of the Aerial Survey and Processing
Vertical and Oblique images in one flight by one camera
Fully automatic Orthophoto production

4. A3 – Rotating Framing Camera
35 kg
Weight (camera + on-board computer)
50*50*40 cm
Size
15 min
Installation time on the plane
up to 720 Mpix
Frame size
9 micron
Pixel size
300 mm
Focal lengths
RGB
Color
12 bit
Color depth
Forward, Roll, Vibration (FMC,RMC,VC)
Motion Compensation
Up to 10 hours of flight
On-board storage
Dual-frequency GPS
GPS
No needed
IMU
Stabilizer mount

5. How it works ?
Video >

6. SLF - Super large frames
Flight
Direction
Single Frame
Super Large Frame – up to 720 Mpix
Lenses
Sweep Movement
Double Frame
Smooth sweep movement;
33 double frames per sweep;
Along strip overlap between frames 2%;
Cross strip overlap between frames 30%;
An overlap between two sweeps – determinable

7. SLF characteristics at minimal speed with > 70% side overlap
280
Ground speed (km/hour)
8,300
6,700
5,000
3,300
1,600
Flight Altitude (m)
25.0
20.0
15.0
10.0
5.0
Nadir GSD (cm)
43.4
34.7
26.0
16.5
5.6
Oblique GSD (cm)
1,968
1,574
1,181
787
394
SLF Short Side (m)
23,613
18,890
14,168
8,777
1,674
SLF Long Side (m) 33 32 16
Number of double-frames
2.9
2.6
0.8
SLF volume (GB)
63.42
40.59
22.83
9.15
0.70
A3 SLF area (sq.km)
14.06
9.00
5.06
2.25
0.56
RC30 frame area (sq.km)
12.24
7.83
4.40
1.96
0.49
Camera 1 frame area (sq.km)
6.64
4.25
2.39
1.06
0.27
Camera 2 frame area (sq.km)
5.65
3.61
2.03
0.90
0.23
Camera 3 frame area (sq.km)

8. SLF characteristics at maximal speed with > 60% side overlap
630
510
450
400
330
Ground speed (km/hour)
8,300
6,700
5,000
3,300
1,600
Flight Altitude (m)
25.0
20.0
15.0
10.0
5.0
Nadir GSD (cm)
41.9
33.0
22.6
12.3
5.4
Oblique GSD (cm)
1,968
1,574
1,181
787
394
SLF Short Side (m)
22,386
17,493
11,248
4,760
1,333
SLF Long Side (m) 32 29 21 13
Number of double-frames
2.6
2.1
1.1
0.6
SLF volume (GB)
58.82
36.43
16.61
4.17
0.54
A3 SLF area (sq.km)
14.06
9.00
5.06
2.25
0.56
RC30 frame area (sq.km)
12.24
7.83
4.40
1.96
0.49
Camera 1 frame area (sq.km)
6.64
4.25
2.39
1.06
0.27
Camera 2 frame area (sq.km)
5.65
3.61
2.03
0.90
0.23
Camera 3 frame area (sq.km)

9. Measurements accuracy – in-strip SLFsα P1 P2 H L Q B P1 P2 B Q Q' α α'  H
Lmax L L'
P1, P2 - SLFs (sweeps)
B - Sweep Base (along flight)
L – Nadir Intersection Ray Distance
α – Nadir Sweep Intersection angle
H - Altitude above ground
L' - Oblique Intersection Ray Distance
α' - Oblique Sweep Intersection angle
 - Oblique Max. angle
Lmax - Sweep Max Oblique Distance

10. Measurements accuracy – inter-strip SLFsB Q α H L
P1, P2 - SLFs (sweeps)
B - Strip Base (between adjacent strips)
L – Intersection Ray Distance
α – Strip Intersection angle
H - Altitude above ground

11. Measurements accuracy – in-strip SLFs
8300
6700
5000
3300
1600
Flight Altitude (m)
25.0
20.0
15.0
10.0
5.0
Nadir GSD1 (cm)
41.9
33.0
22.6
12.3
5.4
Oblique GSD2 (cm)
984
787
649
433
236
Sweep Base (along flight, m(
8.5
7.7
7.1
Sweep Base Ratio (Z/B)
3.4
3.7
4.1
Nadir_Sweep Intersection angle (from Nadir, deg)
2.0
2.5
3.0
3.8
Oblique_Sweep Intersection angle (deg)
0.08
0.06
0.04
0.03
0.02
Nadir_Accuracy on XY (m)
0.90
0.72
0.49
0.33
0.15
Nadir_Accuracy on Z (m)
2.03
1.56
0.83
0.29
0.07
Oblique_Accuracy on XY (m)
1.51
1.19
0.74
0.40
0.16
Oblique_Accuracy on Z (m)

12. Measurements accuracy – inter-strip SLFs
8300
6700
5000
3300
1600
Flight Altitude (m)
25.0
20.0
15.0
10.0
5.0
Nadir GSD1 (cm)
6995
5596
3728
1892
529
Sweep Base (across flight, m(
1.2
1.3
1.8
3.2
Sweep Base Ratio (Z/B)
22.8
20.4
15.8
9.0
Nadir_Sweep Intersection angle (from Nadir, deg)
0.08
0.07
0.05
0.03
0.02
Nadir_Accuracy on XY (m)
0.15
0.12
0.10
Nadir_Accuracy on Z (m)

13. PHOTOMOD Support of VisionMap Data
Supports quasi-panoramic model stereo (from in-strip SLFs).
Supplies all PHOTOMOD instruments of stereo digitizing.
Allows displaying and working with several stereopairs simultaneously.
Support of inter-strip stereo is under way.

14. Conclusion
A3 SLF area significantly larger than the frame area of other cameras
A3 SLF is very useful for the large area stereo-compilation, monitoring and photo-interpretation
Inter-strip SLF measurements accuracy is better than in-strip accuracy
Inter-strip SLFs are recommended for the large scale stereo-compilation