Removal of topographic effects from lunar images using Kaguya (LALT) and Earth-based observations |
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| Authors: | Viktor V Korokhin Yuriy I Velikodsky Yuriy G Shkuratov Vadym G Kaydash Sergey Y Gerasimenko Nikolai V Opanasenko Gorden Videen Carle Pieters |
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| Institution: | 1. School of Physics and Electronic Science, Guizhou Normal University, Guiyang 550001, China;2. State Key Laboratory of Information Engineering in Surveying, Mapping and Remote Sensing, Wuhan 430079, China;3. NAOC-GZNU Center for Astronomy Research and Education, Guizhou Normal University, Guiyang 550001, China;4. Planetary Science Institute, 1700 East Fort Lowell Road, Suite 106, Tucson, AZ 85719-2395, USA;5. The University Museum, The University of Tokyo, Tokyo 1130033, Japan;1. University of Natural Resources and Life Sciences, Vienna (BOKU), Institute of Surveying, Remote Sensing and Land Information, Peter-Jordan-Straße 82,1190 Vienna, Austria;2. German Aerospace Center (DLR), German Remote Sensing Data Center (DFD), Department of Land Surface, Münchner Straße 20, 82234 Weßling, Germany;3. Bavarian State Institute of Forestry (LWF), Department of Information Technology, Research Group: Remote Sensing, Hans-Carl-von-Carlowitz-Platz 1, 85354 Freising, Germany;1. The Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Rd., Laurel, MD 20723, USA;2. Lunar and Planetary Institute, 3600 Bay Area Boulevard, Houston, TX 77058, USA;3. Sandia National Laboratories, Albuquerque, NM 87815, USA;4. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721, USA;5. NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA;6. University of Western Ontario, 1151 Richmond Street, London, ON, N6A 5B7, Canada;7. Center for Remote Sensing, Boston University, 725 Commonwealth Ave., Boston, MA 02215, USA;8. Astrogeology Science Center, U.S. Geological Survey, Flagstaff, AZ 86001, USA;9. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109, USA;1. The University of Western Ontario, Department of Earth Science, Biological and Geological Sciences Building Room 1026, 1151 Richmond St N, London, Ontario, Canada, N6A 5B7;2. Washington University in St Louis, Earth and Planetary Science Department and the McDonnell Center for Space Sciences. 1 Brookings Drive, Rudolph Hall 110, St Louis, MO 63130, USA;3. Westfälische Wilhelms-Universität Münster, Institut für Planetologie., Wilhelm-Klemm Str. 10 48149 Münster, Germany;4. Johns Hopkins University, Applied Physics Laboratory, 11100 Johns Hopkins Rd, Laurel, MD 20723, USA |
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| Abstract: | Lunar images acquired at non-zero phase angles show brightness variations caused by both albedo heterogeneities and local topographic slopes of the surface. To distinguish between these two factors, altimetry measurements or photoclinometry data can be used. The distinction is especially important for imagery of phase-function parameters of the Moon. The imagery is a new tool that can be used to study structural anomalies of the lunar surface. To illustrate the removal of the topographic effects from photometric images, we used Earth-based telescopic observations, altimetry measurements carried out with the Kaguya (JAXA) LALT instrument, and a new photoclinometry technique that includes analysis of several images of the same scenes acquired at different phase angles. Using this technique we have mapped the longitudinal component of lunar topography slopes (the component measured along the lines of constant latitude). We have found good correlations when comparing our map with the corresponding data from Kaguya altimetry. The removal of the topographic surface properties allows for the study of the phase-function parameters of the lunar surface, not only for flat mare regions, but for highlands as well. |
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