Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981m%26p....24....3f&link_type=abstract
Moon and the Planets, vol. 24, Feb. 1981, p. 3-11. In French.
Astronomy and Astrophysics
Astronomy
1
Astrometry, Lunar Craters, Lunar Photographs, Photographic Plates, Selenography, Diameters, Lunar Exploration, Lunar Photography
Scientific paper
An isodensitometric technique for charting lunar craters is presented and compared to the classical visual method. The algorithm used to trace the geometric line representing the edge of the crater on a cathode screen is given. The average divergence of the 50 measurements made using the photographic density matrix from those made by the visual method is 420 m. The automatic method of detection allows good measurements of craters vertically illuminated by the sun, in which case the obtained contour is a closed curve. In the case of important phase effects, the apparent contour of the crater is composed of several lines. It is noted that while the measurements are facilitated by a greater degree of photographic contrast, the quality of the contrast does not alter the coherence of the measurements obtained by the two methods.
Froeschle M. M.
Ounnas Ch.
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