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Dr. Maher mohamed mohamed ayman :: Publications:

Utilization High Spatial Satellite Images Reflectance’s to Estimate the Nautical Charts for the Nile River
Authors: Maher Mohammad Ameen; Abdallah Ahmad Saad; Mervat Mohammad Refaat; Ahmad Mostafa Morad
Year: 2015
Keywords: Satellite Images. Geoeye. Nile River. Reflectance. Estimated Depths
Journal: Australian Journal of Basic and Applied Sciences
Volume: Not Available
Issue: Not Available
Pages: Not Available
Publisher: Not Available
Local/International: International
Paper Link: Not Available
Full paper Maher mohamed mohamed ayman_Utilization High Spatial Satellite Images Reflectance’s.pdf
Supplementary materials Not Available

It has been a long time for the navy research centers to do great efforts and concentrate their researches in developing the used methods for measuring the depths, and increasing their efficiency even this developing is to the traditional methods, or to the remote sensing technique. Due to the presence of the river Nile as a navigational route in Egypt passing from its south to its north, the remote sensing technique was used in this research for measuring the depths, by using multi-spectral band satellite image with resolution 1.65m, which covers an area of almost 15.52 Km²of the river Nile (of width=1Km and length=15.52Km) from Esna to nagaa Hamadii, the image was corrected geometrically, and The radiances were corrected from all of the effective errors. The mathematical equations were used to calculate the reflectance values from the corrected radiance values. From the obtained reflectance, the depths were computed, by using suitable mathematical model. The data analysis mainly depends on the physical principle, which stipulates that upon the passage of electromagnetic waves by aqueous media, it weakens the wave because it passed from a media of a certain density to the media has different densities. The deeper areas will have dark color due to the low light reflected compared with the areas with lower depths. We used the depths measured with echo sounder as reference depths. At the end the estimated depth values were compared with the observed values. The average of the differences was about (1.22 m).

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