Ali Farrag, Farrag 
  
The digital analysis of satellite images proved to be a valuable tool for accurate detection of environmental pollution 
caused by cement factories. This study proved that the digital analysis of high spatial and spectral resolution SPOT 
multispectral images, with computer-aided visual approach, is an applicable tool for accurate locating and monitoring 
such air pollution phenomena. The working condition of factories can be monitored as varieties of pollution intensities 
under different working conditions were distinguished. Unsupervised classification and simple thresholding of the green 
band were found suitable for this purpose. The detected dispersion of air pollution of cement factories can be described 
in its general form by Gaussian Plume model, where the dispersion was mainly in the average wind direction. 
According to the obtained results one can conclude that, SPOT satellite multispectral image proved to be one of the 
most important tools for global environmental monitoring at the resolution of pixel level (20 m). 
6. REFERENCES 
1- Durucan S. 1995. Environmental Management in the Minerals Industries, Reading material of Med-Campus training 
courses and seminars organized by the network ENVIRO-MIN, (Imperial College, London UK). 
2- Farrag, A., 1997. Monitoring of Environmental Pollution Using SPOT Satellite Images, Civil Engineering Research : 
Magazine (Civil Engineering Dept. Al-Azhar University, Egypt). Volume (19) No. (3) pp. 376-388 
3- Michele Chevrel, etl, 1981. The SPOT Satellite Remote Sensing Mission, Photogrammetric Engineering and Remote 
sensing, August 1981, pp. 1163-1171 
4- Nicolas Sifakis, 1992. Mapping of Air Pollution Using SPOT Satellite DATA, Photogrammetric Engineering and 
Remote sensing, October 1992, pp. 1433-1437. 
  
International Archives of Photogrammetry and Remote Sensing. Vol. XXXIIL Part B7. Amsterdam 2000. 53