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Anharmonic Ratios 4 The Scheimpflug Condition
Correction for curvature and refraction thousands of feet page
Classification of AirSurvey Photographs 7 Dip of the Horizon 8 Azimuth
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accuracy adjustment air survey air-base altitude base-line calculated camera centimetre compilation contact prints contour contour interval control points correction Crone construction datum depression angle detail determine diapositive distance distortion draw drawn drill effect elevation error fair-drawing feature flight floating mark focal length goniometer graph ground control height displacement height of aircraft image point instrument intersection kodatrace lateral overlap lens means measured method millimetres minor control motion multiplex oblique obtained operation optical axis orthogonal projection parallax bar parallax differences parallel perspective centre perspective grid perspective projection photo-plane photo-scale photo-writing photogrammetric picture planimetric plot plumb point position precision principal plane principal point principal vertical projector radial rays reading relief right angles roads scale sheet shown slotted templet spot heights stereoscope straight edge strip theodolite tilt topographic trace transference triangle trigs true horizon vertical photograph want of correspondence