This one-month WAC global mosaic was created by mosaicking 2480
nadir-pointing WAC images acquired on orbits 22271 through 22566 (25 May 2014 through
18 June 2014) into a single global image with seamless lighting. The orbit tracks progress
across the Moon from 360°E to 0°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
-84.4° to -71.5°. 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°E to 360°E
longitude and 90°S to 90°N 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 (Speyerer et al. 2014, Pre-flight and On-orbit Geometric Calibration of the Lunar Reconnaissance Orbiter Camera).
All images were corrected to a common photometric geometry using a Hapke model
(Sato et al. 2014, Resolved Hapke parameter maps of the Moon).
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
22311-22526).
Image selection details: Color and monochrome WAC images with data_quality_id < 16, exposure time <=
0.1 seconds, incidence angle < 95° (or image center within 5° of a pole),
off-nadir slew angle < 5°, and orbit between 22271 and 22566, inclusive.
A complete image list can be downloaded under "Supplementary Downloads".
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.
For more information on LROC Reduced Data Records (RDRs), please refer to the
LROC RDR Software Interface Specification (SIS).
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
