ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA ACCURACY OF PHOTOMOD ACCURACY OF PHOTOMOD AERIAL TRIANGULATION AERIAL TRIANGULATION Ivan KATZARSKY, Vanya Ivan KATZARSKY, Vanya PETROVA PETROVA GIS SOFIA Ltd., Bulgaria GIS SOFIA Ltd., Bulgaria
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ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA ACCURACY OF PHOTOMOD AERIAL TRIANGULATION Ivan KATZARSKY, Vanya PETROVA GIS SOFIA.
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ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA
ACCURACY OF ACCURACY OF PHOTOMOD AERIAL PHOTOMOD AERIAL
ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA
The accuracy of aerial triangulation is evaluated by mean square
differences between geodetic and photogrammetric coordinates
of the ground control and check points
RESULTS
Accuracy on the terrain, based on ground control points
Mean square differences between geodetic andphotogrammetric coordinates of the ground control pointsVariants
in X-axis in Y-axis in XY-plane in Z-axisI ± 3.3 cm ± 3.7 cm ± 5.0 cm ± 7.1 cmII ± 3.3 cm ± 3.4 cm ± 4.8 cm ± 5.5 cmIII ± 3.2 cm ± 3.5 cm ± 4.8 cm ± 4.8 cmIV ± 3.8 cm ± 1.1 cm ± 4.0 cm ± 2.3 cm
ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA
Accuracy on the terrain, based on check points
Mean square differences between geodetic andPhotogrammetric coordinates of the check pointsVariants
in X-axis in Y-axis in XY-plane in Z-axisI ± 4.5 cm ± 4.3 cm ± 6.3 cm ± 8.0 cmII ± 5.7 cm ± 5.7 cm ± 8.1 cm ±14.4 cmIII ± 6.5 cm ± 5.8 cm ± 8.7 cm ±14.4 cmIV ± 7.3 cm ± 9.3 cm ±11.8 cm ±26.7 cm
ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA
ANALYSIS
The mean square differences between geodetic and photogrammetric
• In X-axis : ± 3.2 cm to ± 3.8 cm
• In Y-axis : ± 1.1 cm to ± 3.7 cm
• In XY-plane : ± 4.0 cm to ± 5.0 cm
• In Z-axis : ± 2.3 cm to ± 7.1 cm
co-ordinates of the ground control points are in the following range
The mean square differences between geodetic and photogrammetric
co-ordinates of the check points are in the following range
• In X-axis : ± 4.5 cm to ± 7.3 cm
• In Y-axis: ± 4.3 cm to ± 9.3 cm
• In XY-plane: ± 6.3 cm to ± 11.8 cm
• In Z-axis: ± 8.0 cm to ± 26.7 cm
ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA
CONCLUSIONS
• PHOTOMOD aerial triangulation, based on one ground control point
per 4 to 7 pictures, shows best result
• The results strongly depend on the experimental conditions and
parameters. It gives an idea only for the capacity of PHOTOMOD
aerial triangulation. Another experiment could show other results
• Aerial triangulation carried out by PHOTOMOD shows a reliable
accuracy
ACCURACY OF PHOTOMOD AERIAL TRIANGULATION, Ivan KATZARSKY, Vanya PETROVA
THANK YOU FOR YOUR ATTENTION!THANK YOU FOR YOUR ATTENTION!