The WAC farside low-sun mosaic is comprised of 1686 images acquired between July 2010 and July 2012. The images were selected to have similar incidence angles to the nearside "no-slew" mosaic. The top-most layer is from a two-week period in June-July 2011, and the remaining images were selected to match the lighting as closely as possible, and were used to fill small gores. The imaging periods used (from the top-most layer in the mosaic to the bottom-most) were 2011-06-28 to 2011-07-15, 2011-01-15, 2010-07-04 to 2010-08-15, 2012-01-06 to 2012-01-24, and 2012-06-22 to 2012-07-01. A complete image list ordered from top-most to bottom-most is available under "Supplemental Downloads".
All images were map projected onto the GLD100 (WAC derived 100m/pixel DTM) with ephemeris provided by the LOLA and GRAIL team and an improved camera geometry model (Speyerer, E.J. et al, 2014, Pre-flight and On-orbit Geometric Calibration of the Lunar Reconnaissance Orbiter Camera). To reduce brightness discrepancies across image boundaries, all images were corrected to a common photometric geometry using a Hapke model (Sato, H. et al, 2014, Resolved Hapke parameter maps of the Moon). This mosaic uses only the 643 nm band of the WAC.
The WAC farside mosaic is archived in six regional tiles at three different resolutions: 100 meters/pixel, 128 pixels/degree and 256 pixels/degree. Four of the tiles are equirectangular projections that encompass 60° latitude by 90° longitude (90° latitude by 90° longitude for the 128 pixels/degree products). In addition, two polar stereographic projections are available for each pole from 60° to the pole.
Lower resolution products (at 64, 32, 16, 8, and 4 pixels/degree) are available in single equirectangular tiles, centered at 180° longitude (longitude range from 90° to 270°, latitude range from -90° to +90°). Additionally, orthographic products are available at all resolutions showing the hemisphere centered at the equator at 180° longitude, and the polar tiles described above are also available at all resolutions. Each file is named with the following pattern:
[E|P] indicates the map projection (E=Equirectangular or P=Polar Stereographic)
###[N|S] indicates the center latitude in 1/10th degrees North (N) or South (S)
???? indicates the center longitude in 1/10th degrees East
***[M|P] indicates the scale in meters/pixel (M) or pixels/degree (P)
When citing this product, use the following reference:
Wagner, R. V., Speyerer, E. J., Robinson, M. S., & LROC Team. (2015). New Mosaicked Data Products from the LROC Team. In Lunar and Planetary Science Conference (Vol. 46, abstract #1473). https://www.hou.usra.edu/meetings/lpsc2015/pdf/1473.pdf
For more information on LROC Reduced Data Records (RDRs), please refer to the Software Interface Specification (SIS).