sug541 - advanced photogrammetry - simultaneous independent model triangulation
TRANSCRIPT
QUESTION
SIMULTANEOUS INDEPENDENT MODEL TRIANGULATION
1. Determine the number of Unkowns Quantities
2. Determine the number of Observed Quantities
ANSWER
Assumed That:
1. Model Scale is Constant
2. Forward Overlap is more than 50%
3. Side Overlap is more than 20%
4. Good Pass Point distribution
The Unknown Quantities
1. Scale, Rotational of Axes, Translation
4 Models
7 Quantities of each model (λ, ω, φ, К, x, y, z)
= 7 Quantities X 4 Models = 28 Quantities
2. Ground Coordinate of Pass Point
15 Pass Point
3 Quantities of each point (x, y, z)
= 3 Quantities X 15 Pass Point = 45 Quantities
3. Ground Coordinate of Pass Point
6 Exposure Station Point
3 Quantities of each point (x, y, z)
= 6 Quantities X 6 Exposure Station Point = 8 Quantities
Total Unknown Quantities = 28 + 45 + 8
= 81 Quantities
The Measured Quantities
1. Model Coordinates of Pass Point
15 Past Points
3 Quantities in each point (x, y, z)
= 3 Quantities X 15 Past Points = 45 Quantities
2. Model Coordinates of Perspective Center Point
6 Exposure Station Point
3 Quantities in each point (x, y, z)
= 3 Quantities X 8 Exposure Station Point = 24 Quantities
3. Model Coordinates of Ground Control Points
4 GCP
3 Quantities in each point (x, y, z)
= 3 Quantities X 4 GCPs = 12 Quantities
Total Observed Quantities = 45 + 24 + 12
= 81 Quantities