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Proceedings of the Symposium on Progress in Data Processing and Analysis

Roop C. Malhotra
Nautical Charting Division
Charting and Geodetic Services
National Ocean Service, NOAA
Rockville, MD-USA 20852
The National Ocean Service (NOS) camera calibration system consists
of several distinct phases of operation: multiexposure photography
on a multicollimator, mensuration of calibration plate on a high
accuracy comparator, and storage of calibration results in a data
base for further use in various photogrammetric projects. The
integration of the calibration system consists of merging the
mensuration, data processing, and storage phases of the operation
into a unified software program. The entire operation can be
performed on an integrated system, such as the NOS Integrated Digital
Photogrammetric Facility (IDPF). In such a system, once the operator
measures the multiexposure, multicollimator camera calibration
photographic plate, the integrated computer program manipulates the
data and stores camera calibration parameters in the IDPF data base.
The data base is available to users at any one of the photogrammetric
work stations in the IDPF network.
KEY WORDS: Camera, Calibration, System, Integration, Digital,
Photogrammetry, Multicollimator, Data Base, Network.
An innovative camera calibration system has evolved at the NOS
Nautical Charting Research and Development Laboratory, which yields
camera calibration results, that are compatible in accuracy as well
as in form (digital) with the requirements of the NOS IDPF. The IDPF
controls a highly automated digital environment for performing all
photogrammetric office processing.
In order to support the IDPF and applications demanding highest
possible accuracy, a + /-1 to +/-3 micrometers accuracy must be
achieved in the linear parameters of camera calibration. NOS has two
accuracy requirements for camera calibration, 'very high' and 'high'.
The very high accuracy requirement of +/-1 micrometer is for the
calibration of special aerial mapping cameras, which are equipped
with reseau, and used for very high accuracy applications, such as
photogeodesy. On the other hand, the high accuracy camera
calibration requirement of +/-2 to +/-3 micrometers is for the
calibration of standard aerial mapping cameras which are used for
photogrammetric applications in mapping and charting. Furthermore, a
camera tends to deviate appreciably in its calibration parameters
with time and usage for which reason cameras must be calibrated
periodically. Based on the above considerations, NOS, has a general
requirement for calibrating aerial mapping cameras every 2 years. In
view of these requirements, it is desirable that NOS have an in-house
camera calibration capability to assure quality photogrammetric