PROJECT NAME
  WAC TiO2 Abundance Map

CONTENTS
  TiO2 abundance in wt% derived from Wide Angle Camera (WAC) 321/415 nm band ratio [1].

AREAL COVERAGE
  70°N-70°S, 0°E-360°E

SOURCE IMAGES
  The 321 and 415 nm bands of the WAC Hapke Normalized Mosaic from ~124,300 WAC images 
  acquired from January 21, 2010 to May 1st, 2013 [2].

MAP PROJECTION
  Equirectangular (centered at 0°N, 0°E; 400 m/pixel at the equator) using ephemeris 
  data provided by Lunar Orbiter Laser Altimeter (LOLA) and Gravity Recovery and 
  Interior Laboratory (GRAIL) teams [3] and an improved geometric camera model [4].

ESTIMATE OF TIO2 WT% AND MAP CREATION
  From a linear correlation between the TiO2 contents of returned lunar soil samples and 
  the WAC 321/415 nm ratio at the sampling sites, the 321/415 nm ratio map was converted 
  to the TiO2 abundance estimate map. The areas with TiO2 lower than the detection limit 
  (<2 wt%) are set to 1 wt%. See [1] for more details. There are some anomalously high
  values in the TiO2 maps, especially at high latitudes. Values >15% should not be trusted.

PDS PRODUCT NAMING CONVENTION
  The semi-global TiO2 map is cut into 70° latitude by 90° longitude tiles. The tile 
  files are named in following manner: 
      WAC_TIO2_[projection, E for equirectangular][center latitude x10][N/S][center longitude x10]
  As a supplemental material, the WAC TiO2 map without setting the areas of <2 wt% as 
  1 wt% is also available as tiles named: 
      WAC_TIO2_RATIO_[projection, E for equirectangular][center latitude x10][N/S][center longitude x10]
  Notice that the TiO2 variations below 2 wt% (= detection limit) do not correspond to 
  the TiO2 abundance.

  TiO2 Abundance Map:
  Product Name       | Latitude Range | Longitude Range
  -----------------------------------------------------
  WAC_TIO2_E350N0450 |   0° to 70°    |   0° to 90°
  WAC_TIO2_E350S0450 | -70° to 0°     |   0° to 90°
  WAC_TIO2_E350N1350 |   0° to 70°    |  90° to 180°
  WAC_TIO2_E350S1350 | -70° to 0°     |  90° to 180°
  WAC_TIO2_E350N2250 |   0° to 70°    | 180° to 270°
  WAC_TIO2_E350S2250 | -70° to 0°     | 180° to 270°
  WAC_TIO2_E350N3150 |   0° to 70°    | 270° to 360°
  WAC_TIO2_E350S3150 | -70° to 0°     | 270° to 360°

  Supplemental Raw TiO2 Map:
  Product Name             | Latitude Range | Longitude Range
  -----------------------------------------------------------
  WAC_TIO2_RATIO_E350N0450 |   0° to 70°    |   0° to 90°
  WAC_TIO2_RATIO_E350S0450 | -70° to 0°     |   0° to 90°
  WAC_TIO2_RATIO_E350N1350 |   0° to 70°    |  90° to 180°
  WAC_TIO2_RATIO_E350S1350 | -70° to 0°     |  90° to 180°
  WAC_TIO2_RATIO_E350N2250 |   0° to 70°    | 180° to 270°
  WAC_TIO2_RATIO_E350S2250 | -70° to 0°     | 180° to 270°
  WAC_TIO2_RATIO_E350N3150 |   0° to 70°    | 270° to 360°
  WAC_TIO2_RATIO_E350S3150 | -70° to 0°     | 270° to 360°

PRODUCT CITATION
  When citing this product, use the following reference:
  Sato, H., Robinson, M.S., Lawrence, S.J., Denevi, B.W., Hapke, H., Jolliff, B.L.,
  Hiesinger, H. (2017) Lunar Mare TiO2 Abundances Estimated from UV/Vis Reflectance,
  Icarus, 296, 216-238. https://doi.org/10.1016/j.icarus.2017.06.013.

BROWSE PRODUCTS
  Low-resolution 8-bit browse products in PNG format for this product, along with 
  full-resolution 8-bit GeoTIFFs, are available at the following location, with 
  names matching those of the full-resolution IMG files:
  http://lroc.sese.asu.edu/data/LRO-L-LROC-5-RDR-V1.0/LROLRC_2001/EXTRAS/BROWSE/WAC_TIO2/

RDR SIS
  http://lroc.sese.asu.edu/data/LRO-L-LROC-5-RDR-V1.0/LROLRC_2001/DOCUMENT/RDRSIS.PDF

REFERENCES
  [1] Sato, H., Robinson, M.S., Lawrence, S.J., Denevi, B.W., Hapke, H., Jolliff, B.L., 
      Hiesinger, H. (2017) Lunar Mare TiO2 Abundances Estimated from UV/Vis Reflectance, 
      Icarus, 296, 216-238. doi:10.1016/j.icarus.2017.06.013.
  [2] Sato, H., Robinson, M.S., Hapke, B., Denevi, B.W., Boyd, A.K. (2014) Resolved Hapke 
      parameter maps of the Moon. Journal of Geophysical Research Planets 119, 1775-1805. 
      doi:10.1002/2013JE004580.
  [3] Mazarico, E., Rowlands, D.D., Neumann, G.A., Smith, D.E., Torrence, M.H., Lemoine, 
      F.G., Zuber, M.T., (2012), Orbit determination of the Lunar Reconnaissance Orbiter, 
      Journal of Geodesy, Volume 86, Issue 3, pp.193-207, doi:10.1007/s00190-011-0509-4.
  [4] Speyerer, E.J., R.V. Wagner, M.S. Robinson, A. Licht, P.C. Thomas, K. Becker, J. 
      Anderson, S.M. Brylow, D.C. Humm, M. Tschimmel (2014), Pre-flight and On-orbit 
      Geometric Calibration of the Lunar Reconnaissance Orbiter Camera, Space Science 
      Reviews, doi:10.1007/s11214-014-0073-3.