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High Resolution 1:10,000 scale Mapping Strategy of Multi ... - NDMA

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FIDUCIAL MARKS IN NEGATIVES AND CALIBRATION PLATES<br />

A minimum <strong>of</strong> four (4) fiducial marks shall be shown, one at each corner <strong>of</strong> the<br />

format, and they shall be integral parts <strong>of</strong> the lens cone assembly. A total <strong>of</strong><br />

eight (8) such marks is preferable with each mark <strong>of</strong> the second quartet<br />

appearing at the midpoint <strong>of</strong> each side <strong>of</strong> the format.<br />

All fiducial marks shall produce well-defined images in aerial negatives and on<br />

calibration plates so as to permit point plotting on the images with a precision <strong>of</strong><br />

twenty-five (25) microns or less.<br />

TECHNICAL DETAILS OF FILM FOR AERIAL PHOTOGRAPHY<br />

FILM TYPE AND SIZE<br />

Only a fine grain, high sensitivity, high intrinsic resolving power photographic<br />

emulsion on dimensionally stable safety film base shall be used. Outdated film<br />

shall not be used. Unexposed and exposed film shall be stored, handled and<br />

processed in accordance with the manufacturer's guidelines.<br />

The film shall be suitable for photographic reproductions with sufficient<br />

stereoscopic overlap for use in precision photogrammetric instruments to compile<br />

planimetric and/or topographic maps and to measure pr<strong>of</strong>ile and cross section<br />

elevations and heights by photogrammetric means.<br />

The film shall yield an image area <strong>of</strong> two hundred thirty millimeters by two<br />

hundred thirty millimeters (230 MM x 230 MM) for each exposed negative. The<br />

leader length and trailer length shall not be less than two meters (2 M) and one<br />

meter (1 M) respectively.<br />

FILM EXPOSURE<br />

136

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