Abstract
A critical property of digitized sky surveys prepared from photographic materials is the sample interval, δ, used by the microdensitometer. At issue is a tradeoff between coarse sample intervals that, while economical, do not allow the faithful reproduction of the information in photographic material, and fine intervals, which can record all of the information, but at a prohibitive cost. We investigate these issues by conducting Fourier analyses of images characteristic of the imaging process in the absence of noise and by examining the properties of object inventories for a test field digitized at a range of sampling intervals. Both analyses indicate that 15μm is an adequate sampling interval for modern Schmidt plates on Type III emulsions.
The Space Telescope Science Institute is operated by the Association of Universities for Research in Astronomy, Inc., for the National Aeronautics and Space Administration.
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References
Bunclark, P.S., Irwin, M.J., 1984. ‘Astronomy with Schmidt-type Telescopes’, IAU Colloquium No. 78, p. 147, ed. M. Capaccioli, D. Reidel, Dordrecht.
Gunn, J.E., Postman, M., Oke, J.B., Hoessel, J., Schneider, D.P., 1990. Work in progress.
Lasker, B.M., et al., 1989. ‘Digitised Optical Sky Surveys’, CDS Bull., No. 37, p. 5, ed. C. Jaschek.
Lasker, B.M., Sturch, C.R., McLean, B.J., Russell, J.L., Jenkner, H., Shara, M.M., 1990. Astron. J., 99, 2019.
Stobie, R.S., Okamura, S., Davenhall, A.C., MacGillivray, H.T., 1984. Occ. Rept. R.O.E., 14, 219.
Valdes, F., 1989. Private communication, NOAO Computer Support Division.
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© 1992 Springer Science+Business Media Dordrecht
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Laidler, V.G., Lasker, B.M., Postman, M. (1992). The Selection of a Sampling Interval for Digitisation: How Fine is Fine Enough?. In: MacGillivray, H.T., Thomson, E.B. (eds) Digitised Optical Sky Surveys. Astrophysics and Space Science Library, vol 174. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-2472-0_13
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DOI: https://doi.org/10.1007/978-94-011-2472-0_13
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