USGS Aerial Camera Specifications
USGS Aerial Camera Specifications
Nominal focal length (mm) |
88 | 153 | 210 | 305 | |
Deviation of calibrated focal length from nominal (mm) | ± 4 | ± 3 | ± 4 | ± 5 | |
Minimum angular field of view (°) | 120 | 90 | 70 | 50 | |
Maximum useable field angle (°) Optical axis out to | 54.5 | 40 | 30 | 22.7 | |
Maximum lens distortion at maximum aperture (µm) Symmetric radial | ± 15 | ± 10 | ± 20 | ± 20 | |
Tangential component of decentering (µm) | – | 8 | – | – | |
Maximum deviation of calibrated principal point/point of symmetry from principal point of autocollimation (µm) | 30 | 15 | 30 | 30 | |
Stereomodel flatness deviation (µm) | ±17 | ± 19 | – | – | |
Minimum lens resolving power ([cycles or lp]/mm) | – | – | – | – | |
Angle |
|||||
0° | 59 | 80 | 49 | 48 | |
7.5° | 59 | 80 | 49 | 48 | |
15° | 49 | 67 | 42 | 28 | |
22.7° | 42 | 57 | 35 | 24 | |
30° | 35 | 57 | 29 | – | |
35° | 30 | 48 | – | – | |
40° | 17 | 40 | – | – | |
45° | 14 | – | – | – | |
50° | 12 | – | – | – | |
54.5° | 12 | – | – | – |
For all cameras:
- Filter wedge angle <=10 seconds of arc
- Film magazine platen +/- 13 µm from true plane
- Film magazine platen id required
- Fiducial lines of intersection: Lines connecting either opposite side or opposite corner fiducials.
- The intersection points are defined as the indicated principal points (IPPs). (See diagram)
- Fiducial angles of intersection: 90° +/- 1 minute
- Maximum deviation of IPPs from principal point of autocollimation is 30 µm.
- Eight fiducial marks required – no glass marks.