The two Narrow Angle Cameras (NACs) provide high-resolution (0.5 to 2.0 m/pixel) panchromatic images over a combined 5 km swath. Images acquired over many orbits and multiple months can be combined to create mosaics. NAC images acquired under similar lighting conditions (e.g. high sun/low sun) were map-projected using the GLD100 (WAC derived 100 m/pixel DTM) and LOLA derived crossover corrected ephemeris. In some cases images with similar incidence angles and opposite solar azimuth angles (east and west) were used to increase areal coverage. After map projection, the images were shifted in latitude and longitude to minimize offsets in regions of overlap, and the pixel values were scaled to reduce brightness contrasts caused by differences in illumination angles.

Due to the large size of this NAC ROI mosaic, the highest-resolution tiffs and pyramidal tiffs were down-sampled from 0.50 m/px to 0.81 m/px to fit the size constraints of the TIFF format.

When citing this product, use the following reference:

Robinson, M. S., Speyerer, E. J., Boyd, A., Waller, D., Wagner, R. V., & Burns, K. N. (2012). Exploring the Moon with the lunar reconnaissance orbiter camera. Int. Arch. Photogramm. Remote Sens. Spat. Inf. Sci, 39, B4. https://doi.org/10.5194/isprsarchives-XXXIX-B4-501-2012

For more information about this and other RDRs, see the RDR Software Interface Specification (SIS) at http://lroc.sese.asu.edu/data/LRO-L-LROC-5-RDR-V1.0/LROLRC_2001/DOCUMENT/RDRSIS.PDF.

PDS PRODUCT NAMING CONVENTION

The PRODUCT_ID naming convention for LROC NAC ROIs is:

NAC_ROI_xxxxxxxxSSv_AyyyBzzzz[_##M].IMG where

• NAC_ROI = indicating it's a NAC ROI product
• xxxxxxx = words specifying the sitename (8 characters)
• SS = LO for low Sun angle or HI for high Sun angle
• v = incremental character for distinguishing multiple mosaics with similar lighting of the same region. Letters are used for individual mosaics and numbers are used for composite mosaics composed of mulitiple controlled mosaics.
• A = projection type (E for equirectangular, P for polar stereographic)
• yyy = center latitude to the nearest 10th of a degree
• B = N for northern hemisphere, S for southern hemisphere
• zzzz = center longitude to the nearest tenth of a degree. The longitude domain for all NAC DTMs is 360 positive east.
• [_##M] = indicates the pixel scale in meters; used only for supplementary lower resolution products.

Example: NAC_ROI_APOLLO15LOC_E252N0018.IMG is a NAC ROI of the Apollo 15 landing site with low-Sun. C indicates it's the third low-Sun mosaic of the Apollo 15 landing site produced. This mosaic is centered at latitude=25.2N, longitude=1.8E and is in equirectangular projection.

Images used, in order of layering from front to back:

RDR Name	NAC_ROI_LUNOKOD1LOA_E381N3246
Site Name	Lunokhod 1
Center Lat	38.1
Center Lon	324.6
Pixel Scale	0.50 m/px
Image Start Time (UTC)	2009-07-16 14:16:46.467+00
Image Stop Time (UTC)	2011-01-27 08:26:08.504+00
# Images	16
Incidence	Low Sun
Minimum Latitude	37.30
Maximum Latitude	38.93
Minimum Longitude	323.87
Maximum Longitude	325.38

Image ID	Center Lat	Center Lon	Incidence	Pixel Scale
M150756018L	38.43	324.88	66°	0.50 m/px
M150756018R	38.43	324.97	66°	0.50 m/px
M150749234L	38.43	324.95	65°	0.47 m/px
M150749234R	38.44	325.03	65°	0.47 m/px
M135418902L	38.13	324.91	65°	0.51 m/px
M135418902R	38.14	325.00	65°	0.51 m/px
M114185541L	38.17	325.11	66°	0.51 m/px
M114185541R	38.16	325.02	66°	0.51 m/px
M129520649L	38.13	324.91	64°	0.46 m/px
M129520649R	38.12	324.83	64°	0.46 m/px
M120080752L	38.15	325.07	60°	0.47 m/px
M120080752R	38.15	325.15	60°	0.46 m/px
M104747893L	38.12	324.86	60°	1.60 m/px
M104747893R	38.12	325.19	60°	1.60 m/px
M102393073L	37.55	324.07	79°	1.59 m/px
M102393073R	37.56	324.39	79°	1.59 m/px

Link to browse PNG
NAC_ROI_LUNOKOD1LOA

Lunokhod 1 low-Sun semi-controlled NAC mosaic (A)