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Lithological and Structural Mapping Using Satellite Data Mohamed Abdelsalam Missouri S&T

Lithological and Structural Mapping Using Satellite Data Mohamed Abdelsalam Missouri S&T. Vision is the ability to recognize shapes, patterns and colors and to detect and estimate motion, distance and size

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Lithological and Structural Mapping Using Satellite Data Mohamed Abdelsalam Missouri S&T

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  1. Lithological and Structural Mapping Using Satellite DataMohamed AbdelsalamMissouri S&T

  2. Vision is the ability to recognize shapes, patterns and colors and to detect and estimate motion, distance and size The eye has evolved independently in many animals groups such as the composite eye of insects and that of our own The perceptual ability of human beings are learned entirely through experience Vision

  3. The cornea for refraction The iris for controlling the pupil diameter to control the amount of light gathered and the depth of field The lens with 17 mm focal length to adjust focus for objects at different distances The retina (180˚ field of view) is a light-sensitive spherical surface where inverted image are formed through receptors known as rods (130 million) for black and white images) and cones (7 million for color images) Vision - The structure of the Eye www.vrmny.com/anatomy.htm

  4. Rods peaks at about 20˚ away from the fovea and gradually fall off in number towards the edge of the retina Cones contains pigments sensitive to red, green and blue and are concentrated immediately around the fovea The blind spot where the optic nerve leaves the eye (the blind spot) there are neither rods nor cones Rods and Cones

  5. Electromagnetic Spectrum

  6. Additive primary colors: Red Green Blue In equal portions other spectral color are produced: Red+Green=Yellow Red+Blue=Magenta Green+Blue=Cyan Red+Blue+Green=White In non equal portions non-spectral colors are produced Additive Primary Colors

  7. Additive subtractive colors: Magenta Cyan Yellow In equal portions other spectral color are produced: Magenta+Yellow=Red Magenta+Cyan=Blue Yellow+Cyan=Green Magenta+Cyan+Yellow=Black In non equal portions non-spectral colors are produced Subtractive Primary Colors

  8. Hue is the nature of the color and can be described by the wavelength. Red = 0˚ or 360˚, green = 120˚, and blue = 240˚ Saturation = Purity of the color. Zero is completely impure and 90˚ is completely pure Intensity Level, or Value is the grayscale In 8 bit radiometric resolution scheme, Zero is black and 255 is white. Hue-Saturation-Intensity

  9. Hue-Saturation-Intensity

  10. Color Cube for Additive and Subtractive Primary Colors

  11. Color cube for Additive additive primary colors and H-S-I defines the relationship between Red-Green-Blue color space and Hue-Saturation-Intensity color space The H-S-I color space is defined by a cone extending from black (0,0,0) to white (255,255,255) in 8 bit radiometric resolution scheme The Hue is defined by an angle in which Red=0˚ or 360˚; Green=120˚; and Blue=240˚ Saturation ranges between 0˚ for completely impure color and 90˚ for completely pure color Color Cube for Additive Primary Colors and H-S-I

  12. RGB color combination images Band 3 Band 2 Band 1

  13. Color triangle for additive and subtractive primary colors illustrates the relationship between Red-Green-Blue and Magenta-Cyan-Yellow The triangle corners are occupied by Red, Green and Blue whereas the mid-points between these corners are occupied by Magenta, cyan and Yellow The center of the triangle is occupied by white which resulted from the sum of equal portions of Red, Green and Blue Color Triangle for Additive and Subtractive primary Colors

  14. Examples1: Density SlicingThe Beddaho Alteration Zone, Eritrea

  15. Examples2: Synthetic Color ImagesThe Nubian Nile, Sudan

  16. The Nile System

  17. Examples3: Data FusionThe Erta Ale Volcano, Ethiopia

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