This one-month WAC global mosaic was created by mosaicking 3399 nadir-pointing WAC images acquired during orbits 18546 through 18962 (22 July 2013 through 26 August 2013) into a single global image with seamless lighting. The orbit tracks progress across the Moon from 360 degrees E to 0 degrees E over the course of the month of imaging, with beta angles (the angle between the orbital plane and a vector to the Sun) going from -48.4 degrees to -14.6 degrees. Some gores may be present due to spacecraft slews for observations by other instruments. This mosaic uses the 643 nm band of the WAC. It uses a simple cylindrical map projection from 0 to 360 degrees longitude and -90 to 90 degrees latitude. Each image was projected onto the GLD100 (WAC derived 100m/pixel DTM), with accurate positioning of each WAC image ensured using ephemeris provided by the LOLA and GRAIL team and an improved camera geometry model [1]. All images were corrected to a common photometric geometry using a Hapke model [2]. To minimize lighting discontinuities near the poles, the images were mosaicked on a per- pixel basis based on incidence angle (angle between the Sun and the zenith): for each pixel in the output, the data was selected from the image with the lowest incidence angle at that location. A note on timing: To get complete coverage at the poles, the source image list extends slightly beyond the nominal ~28 days for the orbit track to cover the entire Moon. At the equator, the first and last images with visible data will be about 40 orbits (~3 days) after or before the listed start and end times, respectively (roughly orbits 18586-18922). ## Image Selection Details ## Color and monochrome WAC images with: - data_quality_id < 16, - exposure time <= 0.1 seconds - incidence angle < 95 degrees (or image center within 5 degrees of a pole) - off-nadir slew angle < 5 degrees - and orbit between 18546 and 18962, inclusive. A complete image list can be downloaded separately. ## Naming Scheme and Additional Files ## The naming scheme for this product is WAC_ORBITS_XXXXX_YYYYY, where XXXXX is the first orbit number from which images were used, and YYYYY is the last orbit. A low-resolution 8-bit browse product in PNG format for this product is available at: http://pds.lroc.asu.edu/data/LRO-L-LROC-5-RDR-V1.0/LROLRC_2001/EXTRAS/BROWSE/WAC_ORBITS/18546_18962/WAC_ORBITS_18546_18962.BROWSE.PNG A full-resolution GeoTIFF version of this product is available at: http://pds.lroc.asu.edu/data/LRO-L-LROC-5-RDR-V1.0/LROLRC_2001/EXTRAS/BROWSE/WAC_ORBITS/18546_18962/WAC_ORBITS_18546_18962.TIF ## References ## For more information on LROC Reduced Data Records (RDRs), please refer to the Software Interface Specification (SIS): http://pds.lroc.asu.edu/data/LRO-L-LROC-5-RDR-V1.0/LROLRC_2001/DOCUMENT/RDRSIS.PDF [1] Speyerer et al. 2014, Pre-flight and On-orbit Geometric Calibration of the Lunar Reconnaissance Orbiter Camera. http://link.springer.com/article/10.1007%2Fs11214-014-0073-3 [2] Sato et al. 2014, Resolved Hapke parameter maps of the Moon. http://onlinelibrary.wiley.com/doi/10.1002/2013JE004580/abstract