NDLI: Occurrence probability of slopes on the lunar surface: Estimate by the shaded area percentage in the LROC NAC images

Content Provider	Springer Nature Link
Author	Abdrakhimov, A. M. Basilevsky, A. T. Ivav, M. A. Kokhav, A. A. Karachevtseva, I. P. Head, J. W.
Copyright Year	2015
Abstract	The paper describes the method of estimating the distribution of slopes by the portion of shaded areas measured in the images acquired at different Sun elevations. The measurements were performed for the benefit of the Luna-Glob Russian mission. The western ellipse for the spacecraft landing in the crater Bogus-lawsky in the southern polar region of the Moon was investigated. The percentage of the shaded area was measured in the images acquired with the LROC NAC camera with a resolution of ~0.5 m. Due to the close vicinity of the pole, it is difficult to build digital terrain models (DTMs) for this region from the LROC NAC images. Because of this, the method described has been suggested. For the landing ellipse investigated, 52 LROC NAC images obtained at the Sun elevation from 4° to 19° were used. In these images the shaded portions of the area were measured, and the values of these portions were transferred to the values of the occurrence of slopes (in this case, at the 3.5-m baseline) with the calibration by the surface characteristics of the Lunokhod-1 study area. For this area, the digital terrain model of the ~0.5-m resolution and 13 LROC NAC images obtained at different elevations of the Sun are available. From the results of measurements and the corresponding calibration, it was found that, in the studied landing ellipse, the occurrence of slopes gentler than 10° at the baseline of 3.5 m is 90%, while it is 9.6, 5.7, and 3.9% for the slopes steeper than 10°, 15°, and 20°, respectively. Obviously, this method can be recommended for application if there is no DTM of required granularity for the regions of interest, but there are high-resolution images taken at different elevations of the Sun.
Starting Page	285
Ending Page	294
Page Count	10
File Format	PDF
ISSN	00380946
Journal	Solar System Research
Volume Number	49
Issue Number	5
e-ISSN	16083423
Language	English
Publisher	Pleiades Publishing
Publisher Date	2015-09-12
Publisher Place	Moscow
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Moon crater Boguslawsky estimate of slopes analysis of illumination LROC NAC spaceborne images DTM Luna-Glob Astronomy, Astrophysics and Cosmology Planetology Astronomy, Observations and Techniques Astrophysics and Astroparticles
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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