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 0.80 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_LUNOKOD1HIA_E382N3250
Site Name	Lunokhod 1
Center Lat	38.2
Center Lon	325.0
Pixel Scale	0.50 m/px
Image Start Time (UTC)	2009-09-09 03:29:33.786+00
Image Stop Time (UTC)	2010-10-23 17:53:36.404+00
# Images	16
Incidence	High Sun
Minimum Latitude	37.38
Maximum Latitude	39.11
Minimum Longitude	324.26
Maximum Longitude	325.65

Image ID	Center Lat	Center Lon	Incidence	Pixel Scale
M142495666L	37.93	325.07	45°	0.52 m/px
M142495666R	37.93	324.97	45°	0.51 m/px
M127159138L	38.32	325.01	46°	0.46 m/px
M127159138R	38.32	324.93	46°	0.46 m/px
M111822772L	38.19	325.53	49°	0.52 m/px
M111822772R	38.19	325.43	49°	0.52 m/px
M109473626L	38.07	324.74	40°	0.57 m/px
M109473626R	38.07	324.62	40°	0.57 m/px
M109466832L	38.03	325.24	40°	0.54 m/px
M109466832R	38.03	325.13	40°	0.54 m/px
M124804057L	38.26	324.53	37°	0.47 m/px
M124804057R	38.26	324.45	37°	0.47 m/px
M107106240L	38.23	325.10	45°	1.34 m/px
M107106240R	38.23	325.44	45°	1.34 m/px
M107113410L	38.26	324.46	45°	1.34 m/px
M107113410R	38.26	324.80	45°	1.34 m/px

Link to browse PNG
NAC_ROI_LUNOKOD1HIA

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