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

ecognized internationally or approved by the camera manufacturer within the
past three (3) years.
The contracted aerial firm must provide the most recent calibration dates for its
equipment for each project. However, when there is any reason to believe that
the dimensional relationship of the lens, fiducially marks, and film have been
disturbed by partial disassembly or unusual mechanical shock, the camera must
be submitted for recalibration at the contractor’s expense.
Any camera used on a project shall meet the following minimum standards as set
forth by the USGS Calibration Certificate:
1. Radial Distortion: Average distortion for a given field angle is ten (10)
microns or less.
2. Resolving Power: Area weighted average resolution is sixty (60) cycles
per millimeter or greater.
3. Principal Point of Autocollimation: Lines joining pairs of fiducially
(collimation) marks shall intersect at an angle of ninety degrees (90 º ), plus
or minus thirty seconds (30”) of arc, and that intersection shall indicate the
true location of the principal point of auto collimation within twenty-five (25)
microns or less.
4. Filter Parallelism: The two surfaces of all filters used on the camera shall
be parallel to within ten seconds (10”) of arc.
5. Magazine Platen: The platens of all camera magazines shall not depart
from a true plane by more than thirteen (13) microns; that is, thirteen
thousandths of a millimeter (0.013 MM).
6. Stereo model Flatness: No test point in the stereo model shall have an
average departure from flatness of more than twenty-five (25) microns at
negative scale. The stereo model flatness test results shall be provided
for all camera-magazine combinations upon request.
134