Data Set Information
DATA_SET_NAME LRO DLRE 5 GRIDDED DATA RECORDS
DATA_SET_ID LRO-L-DLRE-5-GDR-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION -------------------------------------------------------------------------+Data Product Overview :Level 2 GDRThe Diviner GDR data products are derived directly from the RDR data product. They directly mimic the format and intent of the Lunar Orbiter Laser Altimeter (LOLA) GDR data product for maximum compatibility with LOLA and other products. NASA Level 2 Diviner GDR products include solar reflectances, brightness temperatures, and time-related values such as local time and Julian Date that are binned and averaged according to 27-day LRO mapping cycles. Each averaged product is further split into daytime (local time 06:00 to 18:00) and nighttime (local time 18:00 to 06:00) data products.For each averaged gridded product, an analogous pair of count and error estimate products will be created. Count files will simply contain the number of measurements in each bin. The purpose of the error estimate products is to provide the end user with information regarding the uncertainties in the gridded quantities based on the signal to noise ratios of the Diviner channels, and the number of observations in each bin. Error estimates in local time and Julian Date will be determined by computing the standard deviation in these quantities.Unlike the LOLA GDR data products, which use interpolation to create continuous global grids, Diviner GDR data products will include data gaps in grid cells where no observations were acquired.The Level 2 GDR data products are gridded in cylindrical longitude and latitudinal space and in polar stereographic space (to +/- 75 degrees latitude) at varying resolutions. The master resolution for both types of projections will be 128 pixels per degree (ppd). Only nadir-pointing data are used in these datasets (RDR activity flag : 110: on moon, standard nadir). The thermal channel data was further constrained to brightness temperature values of 10 to 450 K as anything outside this range contains bad data. Observations with excessive noise were also culled. The finite field of view of the Diviner footprints will be taken into account to produce the master maps, which will avoid resolution aliasing problems at higher latitudes. All footprints will be projected by locating the fields of view in three dimensions onto a LOLA 128 ppd digital elevation model of the Moon.In addition to the 128 ppd master resolution maps, a series of lower-resolution maps will also be produced, for both cylindrical and polar projections, at 64, 16, 4, and 1 ppd resolution. This last resolution value produces global lon/lat maps during the LRO primary mission with minimal low-latitude gores.Level 3 GDRNASA Level 3 Diviner GDR products include Christiansen Feature (CF) position, Rock Abundance, Soil Temperature, and Root Mean Square (RMS) fitting errors between measured and modeled radiances.. The CF position is the wavelength of a major mid-infrared emissivity peak near 8-microns. It is a measure of silicate composition and shifts to shorter wavelengths for feldspathic lithologies (e.g. highlands) and longer wavelengths for mafic lithologies (e.g. maria). The CF position is also correlated with geochemical composition (generally shorter CF position for higher Si, Na, Ca and longer for higher Fe, Mg). The CF position is calculated from Diviner channels 3, 4, and 5 radiances. Each radiance is binned and averaged and then converted to brightness temperature. The three point brightness temperature spectrum is solved quadratically to determine the maximum brightness temperature. Emissivity values are then calculated for channels 3, 4, and 5. The emissivity spectrum is solved quadratically to determine the CF position.Two types of CF maps will be created:(1) Standard CF: CF calculated using a quadratic fit to the three 8-micron channels to determine the wavelength location of the emissivity peak. This map will include the best TOD data available for each longitude.(2) Normalized to Equatorial Noon (NEN) CF: Standard CF normalized to equatorial noon by the 'best effort' of the Diviner science team.Rock Abundance and Soil Temperature are derived from nighttime Diviner Channel 6, 7, and 8 observations. The maps were derived by fitting the measured radiances to a two-component model that assumes that the observed scene consists of an unknown mixture of soil and rock. The temperature of the rock component taken from thermal model results assumes a semi-infinite rock thermal inertia of 1000 (MKS units) and the rock fractional coverage and the soil temperature are fitted parameters.RMS fitting errors are with respect to measured and modeled Diviner radiance in channels 6, 7, and 8 using the rock abundance and soil temperature determination technique described in Bandfield et al. (2011). For CF and NEN_CF, a single map for each will be produced. For Rock Abundance, Soil Temperature, and RMS fitting error, ten lunar-hourly maps spanning the local time range of 19:30 to 5:30 will be produced. There will also be a singlemap averaging all hours together for Rock Abundance, Soil Temperature,and Soil Temperature Normalized to Remove Latitudinal Dependencies (STN). All maps will be simple cylindrical projections covering the latitude range -60 to 60 degrees at 32 ppd resolution.Update: 2016-03-19 - Level 3 MapsSeveral improvements were made to the rock abundance retrieval algorithm used here over the previous version described by Bandfield et al. (2011). First, we accounted for regional slopes to predict the modeled rock temperatures using the LROC global digital terrain model (DTM) sampled at 128 ppd (Scholten et al., 2012). The slope and slope azimuth at each location was used to adjust the apparent local time and latitude of the modeled rock temperatures for each measurement. For example, a rock at the equator on a 10 degree south-facing slope would be modeled using rock temperatures for 10 degrees south.This approximation for local slopes results in an improvement in the retrieved rock abundance and rock-free regolith temperature values of Bandfield et al. (2011). The previous data products showed systematic errors of 0.1-0.2% in rock abundance values that were highly correlated with surface slopes. In general, equatorward-facing slopes had slightly elevated rock abundance values relative to poleward-facing slopes, because the rock temperatures were under- and overestimated for equator and pole-facing slopes respectively. These systematic errors are no longer present after accounting for the local slopes in the rock temperature modeling. This improvement in the data reduces the uncertainty in the results presented here, particularly because of our focus on rock distributions with respect to surface slopes. In addition the rock abundance and regolith temperature data products were extended to 80 degrees N/S latitude, though these high latitude data are not used in the work described here. No retrieval is performed where the local slope exceeds the equivalent of 80 degrees latitude. For example, a 10 degree north-facing slope at 75N does not meet the necessary criteria and no rock abundance value would be retrieved at this location.Bandfield, J. L., et al. Lunar surface rock abundance and regolith fines temperatures derived from LRO Diviner Radiometer data. J. Geophys. Res., 116, 010.1029/2011JE003866 (2011).Scholten, F., J. Oberst, K.-D. Matz, T. Roatsch, M. Wahlisch, E. J. Speyerer,and M. S. Robinson (2012) GLD100: The near-global lunar 100 m raster DTM from LROC WAC stereo image data. J. Geophys. Res., 117, E00H1710.1029/2011JE003926.Update: 2016-12-04 - Level 3 'MAPPING' MapsA new subset of Gridded Data Records has been released which containthe string 'MAPPING' in their file name. Specifically theRock Abundance (RA), Soil Temperature (ST), and Soil TemperatureNormalized (STN) have new cumulative 'MAPPING' versions.MAPPING GDRs contain only data collected from October 3, 2009 throughOctober 7, 2011, which corresponds to the mapping orbit phase of the LROmission. These data were acquired during near-circular orbits at ~50 kmaltitude, which are generally lower altitudes than(typical) elliptical orbits.Data Processing Level:The Diviner GDR data products are derived directly from the Diviner Reduced Data Record (RDR) data products.GDRs are CODMAC Level 5 (NASA Level 4).Data Product Generation :The Diviner GDR data products and labels are generated by the Diviner Science Team at UCLA.Data Flow :The Diviner GDRs will be made available via a data release on March 15, 2011, six months after the end of the first yearof mapping orbit. For more information please see the document DP_SIS.HTM(HTML format) or DP_SIS.PDF (Adobe Acrobat format) locatedin the DOCUMENT directory of this archive.
DATA_SET_RELEASE_DATE 2017-12-15T00:00:00.000Z
START_TIME 2009-07-05T12:00:00.000Z
STOP_TIME 2016-10-23T09:00:00.000Z
MISSION_NAME LUNAR RECONNAISSANCE ORBITER
MISSION_START_DATE 2009-06-18T12:00:00.000Z
MISSION_STOP_DATE N/A (ongoing)
TARGET_NAME MOON
TARGET_TYPE SATELLITE
INSTRUMENT_HOST_ID LRO
INSTRUMENT_NAME DIVINER LUNAR RADIOMETER EXPERIMENT
INSTRUMENT_ID DLRE
INSTRUMENT_TYPE RADIOMETER
NODE_NAME Geosciences
ARCHIVE_STATUS IN QUEUE
CONFIDENCE_LEVEL_NOTE Review:This archival data set was examined by a peer review panel prior to its acceptance by the Planetary Data System (PDS). The peer review was conducted in accordance with PDS procedures.Prior to creation of the final version of the archival data set, key elements of the archive were distributed for preliminary review. These included electronic versions of example PDS labels, CATALOG files, and Software Interface Specifications (SISs). These materials were distributed to PDS personnel, the experiment investigator, and others, as appropriate.Data Coverage and Quality:See the section 'Data Coverage and Quality' in RDRDS.CAT.Limitations:Data seen immediately after the instrument is powered on or aftera restart is suspect for a few seconds to a few minutes. The pointinginformation is typically incorrect or missing.Known Issues:None.
CITATION_DESCRIPTION Paige et al., LRO DLRE LEVEL 5 GDR V1.0, NASA Planetary Data System, LRO-L-DLRE-5-GDR-V1.0, 2011.
ABSTRACT_TEXT This data set consists of the Diviner Lunar Radiometer Experiment Gridded Data Records also known as GDRs. The DLRE is a surface pushbroom mapper that measures emitted thermal radiation and reflected solar radiation from the surface of the moon. Two Diviner solar channels measure 0.3-3 micrometers reflected solar radiation. Three Diviner channels near 8 micrometers classify regolith mineralogy by mapping the location of the Christiansen feature. The remaining four Diviner channels measure surface temperature in four spectral bands ranging from 12.5 micrometers to beyond 200 micrometers.
PRODUCER_FULL_NAME DAVID PAIGE
SEARCH/ACCESS DATA
  • Geosciences Web Service
  • Geosciences Online Archives
  • Lunar Orbital Data Explorer
    		•