Ali, Mahmoud El Nokrashy
3- The distance between the objects and van has a great effect on the accuracy. Changing the distance from 53m to
30m increases the accuracy by 40% in Z.
4- Additional parameters when used improve the accuracy significantly which could reach 33%, 24% and 41% in X,
Y and Z directions respectively.
5. Changing the direction of photography from that of van motion to the perpendicular direction improves the
accuracy of the system in all direction than that obtained by the usual case. Side photography has the advantages of
the ability to increase the base line length and have closest object to camera distances. The percentages of
improvements in accuracy when using side photographs with 2.75m base line and 25m average object to camera
distance than the case with base line of 2.05m and 35m average object to camera distance were 30%, 32% and 42%
in X, Y and Z respectively.
6- Increasing the number of camera stations and using them at different heights improve the accuracy significantly
especially in Y direction. The percentages of improvements when using six cameras were 31%, 60% and 28% in X,
Y and Z respectively. While they were 14%, 35% and 15% in X, Y and Z respectively when four camera stations
were used.
REFERENCES
Abbas m. Abbas , 1996. * Accuracy Analysis for New Close Range Photogrammetric Systems." M. Sc. Thesis, Faculty
of Engineering, Al-Minia University.Minia, Egypt.
El-Sheimy, N., 1996. * ^ mobile Multi-Sensor System for GIS Applications in Urban Centers.", International Archives
of Photogrammetry and Remote Sensing, Vol. XXXI, Part B2, Vienna, July 9-19.
Li, R., et al., 1996.“ Mobile Mapping for 3D GIS Data Acquisition" International Archives of Photogrammetry and
Remote Sensing, Vol. XXXI, Part B2, Vienna, July 9-19.
Novak, K., 1991. * Bundle with Self Calibration User Manual", Report, Ohio state University.
Novak, K., 1995. * Mobile Mapping Technology for GIS Data Collection." Photogrammetric Engineering & Remote
Sensing, Vol. 61,No. 5, pp. 493-501.
Thrwat, M., 1996. * Global Positioning System Attitude Determination for Photogrammetry.", Ph.D. Thesis, Helwan
University, Cairo, Egypt.
24 International Archives of Photogrammetry and Remote Sensing. Vol. XXXIII, Part B5. Amsterdam 2000.
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