The two Narrow Angle Cameras (NACs) provide high-resolution (0.5 to 2.0 m/pixel) panchromatic images over a combined 5 km swath. NAC images acquired on consecutive orbits, or occasionally over non-consecutive orbits under very similar lighting conditions (e.g. less than 5° 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.

When citing this product, use the following reference:

Klem, S. M., Henriksen, M. R., Stopar, J., Boyd, A., & Robinson, M. S. (2014). Controlled LROC Narrow Angle Camera High Resolution Mosaics. In Lunar and Planetary Science Conference (Vol. 45, abstract #2885). https://www.hou.usra.edu/meetings/lpsc2014/pdf/2885.pdf

RDR Name NAC_ROI_MESSIER_LOA_E020S0469
Site Name Messier A
Center Lat -2.0
Center Lon 46.9
Pixel Scale 1.80 m/px
# Images 6
Incidence Low Sun

Images used, in order of layering from front to back:
Image ID Center Lat Center Lon Incidence Pixel Scale
M1188059614R -2.04 46.72 74° 1.79 m/px
M1188059614L -2.05 46.58 74° 1.78 m/px
M1188045553R -2.02 47.26 73° 1.83 m/px
M1188045553L -2.03 47.11 73° 1.85 m/px
M1188052583R -2.03 46.99 74° 1.74 m/px
M1188052583L -2.04 46.86 73° 1.75 m/px

Messier A low-Sun controlled NAC mosaic (A)

Mosaic (1.80 m/px) (click for more information)