North Pole Controlled NAC Subsolar Longitude (50 - 60 degrees) Mosaic
NAC_POLE_NORTH_CM_055_P900N0000 - 1 meter/pixel
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This is a mosaic made using a set of 296 controlled images with sub-solar longitudes ranging from 50 degrees to 60 degrees. This is a subset of the images in a controlled mosaic consisting of 9687 NAC images of the lunar north polar region acquired between 2009 and 2014. Control solutions were performed using the ISIS jigsaw application using 405,532 points and over three million measures. The network was constrained using 16,302 points in 226 images that were tied to Lunar Orbiter Laser Altimeter (LOLA) track data. The residuals from the bundle adjustment performed by ISIS jigsaw were (in pixels) a solution variance of 0.40, a mean of 0.52, a standard deviation of 0.48, and a maximum of 13.0. The mosaic was created by selecting images with similar sub-solar longitudes and layering the images such that the most representative image (closest sub-solar point) is on top. The mosaic provides an idea of what the surface looks like with varying degrees of sub-solar azimuths. The illumination mosaics only cover some of the polar region; therefore, blank tiles containing no NAC data and those with only a few NAC images are omitted from the archive. The grayed out portions in the mosaic indicate tiles that were not included the archive due to only a small number of NACs in that tile. The images were map-projected using a 20 meter pixel scale polar digital elevation model derived from LOLA tracks.
The mosaic range is 84 to 90 degrees and is stored as 26 polar stereographic map tiles. The mosaic is tiled into with a scheme that includes four latitudinal bands of 1.5 degrees radiating from the pole. There are four tiles in the first band (88.5 to 90 degrees latitude), eight in the second (87 to 88.5 degrees latitude), twelve in the third (85.5 to 87 degrees latitude), and sixteen in the fourth band (84 to 85.5 degrees latitude).
Each file is named with the following pattern:
NAC_POLE_NORTH_CM_XXX_P###N????
where:
When citing this product, use the following reference:
B. Archinal, L. Weller, J. Richie, E. Lee, K. Bennett, E. Speyerer, and T. Tyburczy. (2023) Controlled High-Resolution LROC NAC Polar Mosaics. In Lunar and Planetary Science Conference (Vol. 54, abstract #2333). https://www.hou.usra.edu/meetings/lpsc2023/pdf/2333.pdf
Low-resolution 8-bit browse products in PNG format for this product, along with full-resolution 8-bit GeoTIFFs, are available at the following location, with names matching those of the full-resolution IMG files: http://lroc.sese.asu.edu/data/LRO-L-LROC-5-RDR-V1.0/LROLRC_2001/EXTRAS/BROWSE/NAC_POLE/NAC_POLE_NORTH_CM_AVG
For more information on LROC Reduced Data Records (RDRs), please refer to the Software Interface Specification (SIS): http://lroc.sese.asu.edu/data/LRO-L-LROC-5-RDR-V1.0/LROLRC_2001/DOCUMENT/RDRSIS.PDF