LRO LOLA Gridded Data Record Sky Visibility (GDRSKY)
GDRSKY – Gridded Data Record Sky Visibility
Instrument: Lunar Orbiter Laser Altimeter
PDS Data Set ID: LRO-L-LOLA-4-GDR-V1.0
For more information about LOLA RDR and derived products, see the RDR Product SIS.
For more information about all LOLA products, see the LOLA Archive Volume SIS.
The Lunar Orbiter Laser Altimeter (LOLA) Gridded Data Record Sky Visibility (GDRSKY) data product is a map of the solid angle of the sky as visible from the lunar surface. It can be useful for the calibration of lunar flux calculations, such as incoming cosmic rays or projectiles.
Maps are distributed in polar stereographic projection, with a map resolution at the pole of 240 m/pix. The maps in the 2011 directory extend to +/- 264 km in both directions, which corresponds to complete coverage from ~81.3 degrees to the poles, and partial coverage down to ~77.7 degrees. The maps in the 2014 directory extend to +/- 770 km in both directions, which corresponds to complete coverage from 65 degrees to the poles, and partial coverage down to ~55.2 degrees.
The value is scaled and offset.
Value = DN * SCALING_FACTOR + OFFSET. (DN = Digital Number)
LOLA GDRSKY products have the following file names:
nn = degrees of complete coverage
81 = 2011 products
65 = 2014 products
p = pole
N = north polar region
S = south polar region
xxx = file type/extension
.IMG = image file
.LBL = detached PDS label
.JP2 = JPEG2000 file
_JP2.LBL = detached PDS label
In ODE, GDRSKY products have the following product IDs: