The two Narrow Angle Cameras (NACs) provide high-resolution (0.5 to 2.0 m/pixel) panchromatic images over a combined 5 km swath. While not designed to image within the Permanently Shadowed Regions (PSR) near the lunar poles, the LROC NACs can obtain useful images with long exposure observations of PSRs at time of maximum secondary illumination. The increased exposure time (20x to 80x) leads to pixel smear and elongated pixels in the along track direction, and thus reduced image resolution compared to typical NAC images (10-40 m/pixel vs. 0.5-2 m/pixel). This may also result in bright saturated pixels outside the PSR. For more information about PSRs and PSR products, refer to [1] or the PSR Atlas. NAC images acquired on consecutive orbits, or occasionally over non-consecutive orbits under very similar lighting conditions (e.g. less than 5 degrees difference in incidence angle and the same sun direction), can be combined to create controlled mosaics. A control network is generated to tie the images to the most accurate ground truth available and a bundle adjustment is performed to correct for pointing errors and image alignment. The images are then map- projected using the GLD100 (WAC derived 100 m/pixel DTM) and LOLA derived crossover corrected ephemeris and mosaicked together into an almost seamless mosaic of the region. A manual linear stretch is performed on images for the final mosaic and it is cropped to the PSR region using a PSR boundary shapefile to create an additional mosaic product. The PSR boundary shapefile is derived from PSR maps modeled from LOLA [2]. To determine which PSR ID corresponds with which PSR, refer to the downloadable PSR map.

When citing this product, use the following reference: Cisneros, E., Awumah, A., Brown, H. M., Martin, A. C., Paris, K. N., Povilaitis, R. Z., Boyd, A. K., & Robinson, M. S. (2017, March). Lunar Reconnaissance Orbiter Camera Permanently Shadowed Region Imaging - Atlas and Controlled Mosaics. In Lunar and Planetary Science Conference (Vol. 48, Abstract #2469).

PSR Atlas
North PSR Pole Mosaic

[1] Cisneros, E., et al. "Lunar Reconnaissance Orbiter Camera Permanently Shadowed Region Imaging - Atlas and Controlled Mosaics." Lunar and Planetary Science Conference. Vol. 48. 2017. Abstract #2469.

[2] Mazarico, E., et al. "Illumination conditions of the lunar polar regions using LOLA topography." Icarus 211.2 (2011): 1066-1081.

Site Name Permanently Shadowed Regions in Peary
PSR IDs NP_879680_0297220
Center Lat 87.6
Center Lon 45.4
Pixel Scale 14.00 m/px
# Images 3
Incidence Low Sun

Images used, in order of layering from front to back:
Image ID Center Lat Center Lon Incidence Pixel Scale
M1144972781R 87.87 36.71 89° 18.27 m/px
M1119023956L 87.83 23.59 87° 18.77 m/px
M1144944359R 87.84 41.08 89° 5.16 m/px

Permanently Shadowed Regions in Peary low-Sun controlled NAC mosaic (A)

Cropped and stretched mosaic (14.00 m/px) (click for more information)