Block Adjustment of a Group of Overlapping CCD Images

Details Block Adjustment of a Group of Overlapping CCD Images Block Adjustment of a Group of Overlapping CCD Images

Aug 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aj....128..911y&link_type=abstract

The Astronomical Journal, Volume 128, Issue 2, pp. 911-919.

Astronomy and Astrophysics

Astronomy

5

Astrometry, Methods: Data Analysis, Reference Systems

Scientific paper

Since the field of view of a CCD is usually too small to cover enough reference stars, the block adjustment (BA) of CCD overlapping images is proposed in order to extend the sky coverage of observations, mitigate the effect of the position biases of reference stars, and consequently improve the local reference frame (LRF) of the observation. Observational equations of BA are given in vectorial expressions for the sake of easy understanding and programming. Investigation of the extrapolation of linear and nonlinear models illustrates that the nonlinear terms in CCD models should be determined and eliminated before implementing BA. The BA method is tested by simulated data as well as CCD observations, which shows that the application of BA to the overlapping observations could effectively improve the LRF of the observation and provide homogeneous results.

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