LRO Mini-RF Mosaic Derived Data Record (MOSDDR)
MOSDDR – Derived Global Mosaic Data Record
Instrument: Mini-Radio Frequency
PDS Data Set ID: LRO-L-MRFLRO-5-GLOBAL-MOSAIC-V1.0
For more information about MOSDDR products, see the MOSDDR User Guide.
For more information about Mini-RF products, see the Mini-RF Archive Volume SIS.
The Mini-RF (MRFLRO) Derived Global Mosaic Data Record (MOSDDR) data product is a global uncontrolled mosaic of the Moon in simple cylindrical projection. The images are derived from Map-projected Calibrated Data Records (MAPCDR). Unlike the lower-level products, these are composed of data sets collected during multiple acquisitions.
The MOSDDR products are generated using the Integrated Software for Imagers and Spectrometers (ISIS) software provided by the Astrogeology branch of the U.S. Geological Survey (USGS). The MAPCDR files are ingested in order of orbit and the 4-band Real (Re), Imaginary (Im), Horizontal (H), and Vertical (V) image cube products are formatted to ISIS compatible form. Different viewing geometries are not differentiated in the construction of these products. These are then projected to a 128 pixels per degree (ppd) simple cylindrical projection. The Stokes parameters are then calculated. Partial mosaics are constructed for directories, each consisting of 100 orbits of data. Image product crossovers are also mosaicked chronologically by orbit. Global mosaics are then constructed of the four Stokes parameters and are mosaicked in order by orbit. Smaller 32 ppd image products are constructed by down-sampling the 128 ppd image products. From these products the additional data products are calculated.
Additional Data Product Parameters
Symbol |
Parameter |
Equation |
S1 |
1st Stokes parameter |
S1 = |ERH|+|ERV| |
S2 |
2nd Stokes parameter |
S2 = |ERH|-|ERV| |
S3 |
3rd Stokes parameter |
S3 = 2*Re |
S4 |
4th Stokes parameter |
S4 = -2*Im |
OC |
Opposite-sense parameter |
OC = S1+S4 |
SC |
Same-sense parameter |
SC = S1-S4 |
CPR |
Circular polarization ratio |
CPR = SC/OC |
LPR |
Linear polarization ratio |
LPR = (S1-S2)/(S1+S2) |
M |
Degree of polarization daughter |
M = [(S22+S32+S42)0.5]/S1 |
MC |
Degree of circular polarization |
MC = -S4/(M*S1) |
ML |
Degree of linear polarization |
ML = [(S22+S32)0.5]/(M*S1) |
Note: Since December 26 2010, the Mini-RF instrument has not transmitted the RF energy required to create radar images of the lunar surface. The Mini-RF team looked at the initial 13 collects attempted from that date forward and noted that in all but one collect the data appeared bad, looking like noise. The team continued to attempt data collections at a reduced rate (about 1 collect per day) through January 23, 2011. Products included in this data set made from data collected after December 26, 2010, do not contain scientifically useful data.
MRFLRO MOSDDR products have the following file names:
GLOBAL_tt_rrPPD_SIMP_0C.IMG (with detached PDS label)
where:
GLOBAL = global coverage
tt = product type
S1, S2, S3, S4 = Stokes parameters S1-S4
SC = same-sense polarization image file
OC = opposite-sense polarization image file
CPR = circular polarization ratio image file
LPR = linear polarization ratio image file
M = degree of polarization daughter product
MC = degree of circular polarization parameter product
ML = degree of linear polarization parameter product
rr = pixel resolution bin scale in pixels per degree (32 or 128)
SIMP = simple cylindrical projection
0C = center longitude
In ODE, MOSDDR products have the following product IDs:
GLOBAL_TT_RRPPD_SIMP_0C.IMG