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Mirosława Szopa

Military University of Technology Institute o f Optoelectronics. Correction of reflectance characteristics of chosen natural and anthropogenic materials for airborne laser scanning system. Mirosława Szopa. INCIDENT LIGHT. REFLECTION. EMISSION. ABSORPTION. TRANSMISSION.

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Mirosława Szopa

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  1. Military University of Technology Institute of Optoelectronics Correctionof reflectancecharacteristics of chosen natural and anthropogenic materials for airborne laser scanning system Mirosława Szopa

  2. INCIDENT LIGHT REFLECTION EMISSION ABSORPTION TRANSMISSION Electromagnetic radiation which interact with boundary oftwo media characterized by different refractive index, undergo four various phenomena:

  3. Characteristics of reflection are depended on physical properties of optic materials, characteristics of boundary layer, and wavelength of incident radiation SPECULAR-DIFFUSE SPECULAR BACKREFLECTION DIFFUSE REAL

  4. Reflectance is a proportion between power of reflected beam and incident beam of radiation and can be expressed as a fraction (R1), as a percent (R2), or decibels (R3):

  5. Effective Target Cross Section (ETCS) SOLID ANGLE SOURCE OF LIGHT solid angle reflectance in decibels target area PARAMETERS OF REFLECTING MATERIAL

  6. Values of reflectanceof chosen materials ICE GREEN PLANT CONCRETE REFLECTANCE [%] 0 20 40 60 80 0,5 1,0 1,5 2,0 2,5 WAVELENGTH [um]

  7. Reaching receivers signal, which carries information on analyzed material reflectance is subject to weakness on the path in atmosphere (extinction)caused by phenomena of light absorption and scattering,

  8. Extinction of light for analyzed wavelengths : λ1 = 850 nm, λ2 = 900 nm, λ3 = 1500 nm with chosen atmospheric conditions (described by meteorological visibility)

  9. Meteorological visibility = 10 km SIGNAL PROPORTIONS 850/1500 nm SIGNAL PROPORTIONS 900/1500 nm SIGNAL PROPORTIONS 850/900 nm without extinction with extinction without extinction with extinction without extinction with extinction Extinction of radiationon the path in atmosphere causes disorders of signal proportions for chosen wavelengths.

  10. SIGNAL PROPORTIONS 850/1500 nm SIGNAL PROPORTIONS 900/1500 nm SIGNAL PROPORTIONS 850/900 nm without extinction with correction without extinction with correction without extinction with correction Correction was carried out with allowance of character of reflection obtained from materials, various atmospheric conditions stated by meteorological visibility, and spectral characteristics of atmospheric extinction.

  11. The proposed method of correction provides minimization of real values falsification and decrease in obtained measurement errors, which do not exceed the value of 5% for the analyses from a distance of 0.5 km with atmospheric visibility of 10 km, and for the analyses from a distance of 1 km with atmospheric visibility of 20 km.

  12. CONCLUSION Basing on the fundamental assumption of theremote sensing technique, which says that every material has its own specific spectral characteristics, and after precise analysis of reflectance of chosen materials, it is possible toelaborate the airborne laser scanner. The aim of this scanner would be detection and localization of materials and objects in analyzed area of space on the basis of reflection signal analysis using proposed method of signal correction .

  13. Thankyou for attention Mirosława Szopa Tytuł

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