# indicates the center latitude in 1/10th degrees North (N) or South (S) indicates the map projection (E=Equirectangular or P=Polar Stereographic) Each file is named with the following pattern (see table below for examples): Additionally, orthographic products are available at all resolutions showing the hemispheres centered at the equator at 0°, 60°, 120°, 180°, 240°, and 300° longitude, and the polar tiles described above are also available at all resolutions. Lower resolution products (at 64, 32, 16, 8, and 4 pixels/degree) are available in single global equirectangular tiles, centered at either 180° or 0° longitude (longitude ranges from 0° to 360° and -180° to 180°, respectively, and latitude range always from -90° to +90°). The remaining two tiles are polar stereographic projections for each pole from 60° to the pole. Eight of the tiles are equirectangular projections that encompass 60° latitude by 90° longitude (for the 128 pixels/degree products, these tiles extend from the equator to the pole). The WAC global mosaic is archived in ten regional tiles at three different resolutions: 100 meters/pixel, 256 pixels/degree, and 128 pixels/degree. This mosaic uses only the 643 nm band of the WAC. et al, 2014, Resolved Hapke parameter maps of the Moon). To reduce brightness discrepancies across image boundaries, all images were corrected to a common photometric geometry using a Hapke model with model parameters varying across the Moon ( Sato, H. et al, 2014, Pre-flight and On-orbit Geometric Calibration of the Lunar Reconnaissance Orbiter Camera). Accurate positioning of each WAC image was ensured using ephemeris provided by the LOLA and GRAIL team and an improved camera geometry model ( Speyerer, E.J.

The non-polar images were map projected onto the GLD100 (WAC derived 100m/pixel DTM) while polar images were map projected on the LOLA shape model (80° to 90° N/S) and the GLD100 (60° to 80° N/S). Some gores were filled with data taken at other times between -31 complete image lists for each tile are available under 'Supplementary Downloads'.

To even out the incidence angle variations, the mosaic is comprised of data collected over three periods ( to, to, to ) (Table 1). The WAC maps the whole Moon in one month, however the solar incidence angle at the equator changes about 28° from the beginning to the end of the month. Swirls are not only a place to test our ideas on space weathering of the surface, but of the efficiency of dust migration across the surface,' Domingue said.The WAC global mosaic is comprised of over 15,000 images acquired between November 2009 and February 2011. 'The question becomes how much do we understand the processing of the lunar surface and the migration of fine-grained materials. However, some of these properties can also be explained by the differences in the fine-grained versus the courser-grained components of the lunar soils, not just by weathering differences. This is strong evidence that solar wind shielding plays a role in their formation. All of this is in comparison to the background surface.

The dark albedo regions show spectral properties that are more mature than the bright areas. The light or bright albedo regions represent areas that are shielded by the associated magnetic anomalies, show spectral properties that are less mature, and display a decreased abundance of implanted solar wind hydrogen (which forms OH). The light and dark albedo patterns that define swirls appear intertwined. 'For swirls, dust transport is the process most affected by elevation changes and we now re-examine the role of dust mobility across the lunar surface in the context of this new discovery,' Domingue said. These differences are apparent in the meter-scale-resolution topographical data. Two swirl regions in Mare Ingenii-a large, dark basaltic plain formed by ancient volcanic eruptions on the Moon's far side-display a correlation between albedo and topography, where the bulk elevation in the bright regions is lower than the bulk elevation in the dark regions. This correlation argues that there is more than just shielding from space weathering that goes into their creation,' Domingue said. 'Until now the swirls were thought to overlay the topography, which has been cited as part of the evidence that they are created through shielding of the surface from the solar wind by the magnetic fields present at swirls. PSI scientists John Weirich, Frank Chuang, Amanda Sickafoose and Eric Palmer are co-authors.

Albedo is the measure of brightness or the proportion of light reflected from a surface, with a dark object having a low albedo. 'This is the first time there has been a demonstrated correlation between the swirl albedo patterns and topography,' said PSI Senior Scientist Deborah Domingue, lead author of 'Topographic Correlations within Lunar Swirls in Mare Ingenii' that appears in Geophysical Research Letters.

Lro quickmap