Computer Science
Scientific paper
Sep 1974
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974moon....9..305g&link_type=abstract
The Moon, Volume 9, Issue 3-4, pp. 305-321
Computer Science
Scientific paper
An account is given of the results of a comparison of existing basic selenodetic systems in the equatorial zone of the Moon together with plan and altitude data, which have been provided by means of a specially worked out method, based on the use of the LAC charts of the Moon (scale 1:1000000), and which does not require the presence of common catalogued reference points. It is shown that systematic differences of the form (Δβ) λ for different catalogues are, on the whole, relatively small and do not exceed 2'. Systematic differences of the form (Δλ) λ have a minimum in the regionλ = ± 20° and significantly increase towards the edges of the visible disk, where they may attain a value of 6' between catalogues. Random errors in latitudeσβ have on the whole, a similar behaviour in different catalogues, being practically independent of longitude and not exceeding 3'. Random errors in longitudeσλ significantly increase towards the limb regions in all the studied catalogues, and may reach values of 6 to 8'. Author's estimates of the accuracy of absolute heights in selenodetic catalogues is not always sufficiently precise; in certain cases it was found that the accuracy was underestimated by a factor of one and a half. The data on relative heights in the LAC charts are expressed with a vertical step of 300 m, errors in these values are of the order of 250 m for each step in height. As a result of the comparison a set of better points has been obtained forming a catalogue which may be referred to as LPL. The selection was made on the basis of magnitude and character of both the systematic and random errors.
Burba George A.
Gurshtein Alexander A.
Konopikhin A. A.
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