This preliminary mosaic of an Artemis III candidate landing site is composed of images selected to optimize illuminated terrain coverage. As a first step, the thousands of NAC images of the south pole were filtered to the region of interest. To determine optimal image ordering, we used sub-solar longitudes to guide the image selection to ensure local areas had consistent lighting geometries. For a first pass at offset correction, we used the results of aligning most of the LROC NAC images poleward of 84° south as described in Wagner et al. 2022 (LPSC LIII, Abstract no. 2573). Each image was then map-projected at native image resolution (1 m/px) and images with sub-solar longitudes within 10° to 20° bins were mosaicked together. As a second pass at offset correction, we compared the sub-solar longitude mosaics to the LOLA shaded relief product (10 m pixel scale). The final mosaic is a 1 m/pixel 16-bit (unsigned word) GeoTiff masked along boundaries between images with different lighting and blended for a more "seamless" mosaic. This Artemis III candidate landing site has two multi-lighting mosaics made with varying sub-solar longitude. This mosaic (2 of 2) is composed of 26 NACs and 2 bins of sub-solar longitude. We estimate the absolute positional accuracy to be 10 to 20 m. [NASA/GSFC/Arizona State University/Intuitive Machines]

When citing this product, use the following reference: Henriksen, M. R., Burnette, S.R., Brown, H.M., Wagner, R.V., Robinson, M.S., Collins, W.M., Grieser, S.A., Boyd, A.K. (2023), Optimized Illuminated Terrain Coverage of the Candidate Artemis III Landing Sites with LROC NAC Controlled Mosaics. European Lunar Symposium, https://sservi.directus.app/assets/2483b7e0-a336-443d-8739-3d5f4756e1fb.pdf, pg 134-135.

For more information about this and other RDRs, see the RDR Software Interface Specification (SIS) at http://pds.lroc.im-ldi.com/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.

This mosaic is a composite mosaic formed from the following NAC ROI controlled mosaic products:

• NAC_ROI_CABEUSPKLOA
• NAC_ROI_CABEUSPKLOC

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

RDR Name	NAC_ROI_CABEUSPKLO2_P836S2912
Site Name	Peak Near Cabeus B
Center Lat	-83.6
Center Lon	291.2
Pixel Scale	1.00 m/px
Image Start Time (UTC)	2010-10-26 16:13:54.334+00
Image Stop Time (UTC)	2014-05-12 13:32:06.461+00
# Images	26
Incidence	Low Sun
Minimum Latitude	-84.06
Maximum Latitude	-83.21
Minimum Longitude	-72.47
Maximum Longitude	-64.80

Image ID	Center Lat	Center Lon	Incidence	Pixel Scale
M1154512294L	-83.41	296.33	89°	1.39 m/px
M1154512294R	-83.39	295.58	89°	1.39 m/px
M1154519414L	-83.27	295.37	89°	1.39 m/px
M1154519414R	-83.24	294.64	89°	1.39 m/px
M1154526528L	-83.47	293.35	90°	1.38 m/px
M1154526528R	-83.45	292.61	90°	1.38 m/px
M1154533647L	-83.41	292.05	90°	1.38 m/px
M1154533647R	-83.39	291.33	90°	1.38 m/px
M1154540740L	-84.66	285.65	90°	1.37 m/px
M1154540740R	-84.62	284.79	90°	1.37 m/px
M142748901L	-83.16	294.54	82°	1.02 m/px
M142748901R	-83.17	293.89	82°	1.02 m/px
M142755686L	-83.18	293.51	82°	1.02 m/px
M142755686R	-83.19	292.87	82°	1.01 m/px
M142762470L	-83.18	292.47	82°	1.01 m/px
M142762470R	-83.19	291.83	82°	1.01 m/px
M142769254L	-83.18	291.43	82°	1.00 m/px
M142769254R	-83.19	290.80	82°	1.00 m/px
M142776038L	-83.16	290.40	82°	0.99 m/px
M142776038R	-83.17	289.77	82°	0.99 m/px
M142782822L	-83.17	289.45	82°	0.99 m/px
M142782822R	-83.19	288.83	82°	0.99 m/px
M142789606L	-83.15	288.53	82°	0.98 m/px
M142789606R	-83.16	287.91	82°	0.98 m/px
M142796390L	-83.15	287.69	82°	0.97 m/px
M142796390R	-83.16	287.08	82°	0.97 m/px

Link to browse PNG
http://pds.lroc.im-ldi.com/data/LRO-L-LROC-5-RDR-V1.0/LROLRC_2001/EXTRAS/BROWSE/NAC_ROI/CABEUSPKLO2/NAC_ROI_CABEUSPKLO2_P836S2912.BROWSE.PNG

Peak Near Cabeus B low-Sun controlled NAC mosaic (Combined mosaic #2)