Photogrammetry

Photogrammetry

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  Prepared by Sampath Kathroju HODCivil Dept,
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  Black and WhiteAerial PhotographsBlack and White Aerial Photographs
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  Color Aerial PhotographsColorAerial Photographs
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  NIR Aerial PhotographsNIRAerial Photographs Photo taken as part of the NAPP mission in color IR at a scale of 1:40,000. (1”=3,333’). This image has been enlarged by x factor.
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  2. Basic Elements2.Basic Elements ► Fiducial marksFiducial marks ► Principle pointPrinciple point ► Ground nadirGround nadir ► Photographic nadirPhotographic nadir ► IsocenterIsocenter
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  Date of Photography Principal Point NadirPoint Mission ID Frame Number Fiducial Marks
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  Geometric Errors ofVertical AerialGeometric Errors of Vertical Aerial PhotographyPhotography ► Optical distortionOptical distortion   - caused by camera problems  - caused by camera problems ► TiltTilt - caused by displacement of the focal plane from a- caused by displacement of the focal plane from a truly horizontal position by aircraft motion (attitude)truly horizontal position by aircraft motion (attitude)    - image areas on the upper side of the tilt depict- image areas on the upper side of the tilt depict ground features in smaller than the normal scaleground features in smaller than the normal scale    - Roll, Crab, Pitch- Roll, Crab, Pitch
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  TiltTilt ► Roll distortionRolldistortion  - about its flight axis - about its flight axis - roll compensation- roll compensation ► Crab distortionCrab distortion  - caused by deflection of aircraft due to crosswind - caused by deflection of aircraft due to crosswind - corrections: on the plane or by computer- corrections: on the plane or by computer ► Pitch distortionPitch distortion  - result in local scale change - result in local scale change  - can be ignored in most analyses - can be ignored in most analyses
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  TiltTilt
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  Relief DisplacementRelief Displacement