Data Set Information
DATA_SET_NAME MGN V RDRS 5 COMPOSITE DATA RECORD ALT/RAD V1.0
DATA_SET_ID MGN-V-RDRS-5-CDR-ALT/RAD-V1.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : Altimetry/Radiometry Composite Data Record (ARCDR). Along track estimates of elevation, Fresnel Reflectivity, surface roughness, brightness temperature, emissivity derived from Magellan altimeter and radiometer data. Elevation is derived by fitting altimeter echo from fan beam antenna as a function of time to Hagfors' radar backscatter model templates. Elevation, surface Fresnel reflectivity, and surface RMS slopes are extracted simultaneously. Brightness temperature and emissivity are derived from the HGA antenna in its side-looking mode. Further, radar backscatter images from the HGA are used to correct Fresnel reflectivity measurements for the extent of diffuse as opposed to quasi-specular scatter. See: Software Interface Specification Document (Peter G. Ford, 1991, Altimetry and Radiometry Composite Data Record, MIT-MGN-ARCDR SIS Version 2.3, 40 p.) that is included on ARCDR CD-ROMs. Times are in Temps Dynamique Baricentrique (TDB) units. Processing Level Id : 5 Software Flag : N Processing Start Time : 1991-03-27T16:00:15.000 Processing Stop Time : 1992-12-04T00:55:49.000 Parameters : Data Set Parameter 'BRIGHTNESS TEMPERATURE' ------------------------------------------- The kinetic temperature of an ideal blackbody which, if observed with the spectral response of the instrument spectral channel in question would yield the observed radiance. Data Set Parameter Name : BRIGHTNESS TEMPERATURE Data Set Parameter Unit : KELVIN Sampling Parameter Name : ALONG TRACK DISTANCE Sampling Parameter Unit : KILOMETER Minimum Sampling Parameter : N/A Maximum Sampling Parameter : N/A Sampling Parameter Resolution : 28.28 Sampling Parameter Interval : 10 Minimum Available Sampling Int : 5 Noise Level : UNK Data Set Parameter 'EMISSIVITY' ------------------------------- Emissivity is the ratio of radiance received from a target, at a given kinetic temperature, to the radiance received fro a blackbody at the same temperature. Data Set Parameter Name : EMISSIVITY Data Set Parameter Unit : DIMENSIONLESS Sampling Parameter Name : ALONG TRACK DISTANCE Sampling Parameter Unit : KILOMETER Minimum Sampling Parameter : N/A Maximum Sampling Parameter : N/A Sampling Parameter Resolution : 28.28 Sampling Parameter Interval : 10 Minimum Available Sampling Int : 5 Noise Level : UNK Data Set Parameter 'PLANETARY RADIUS' ------------------------------------- Radial distance from center of planet or satellite to given location on the surface. Data Set Parameter Name : PLANETARY RADIUS Data Set Parameter Unit : KILOMETER Sampling Parameter Name : ALONG TRACK DISTANCE Sampling Parameter Unit : KILOMETER Minimum Sampling Parameter : N/A Maximum Sampling Parameter : N/A Sampling Parameter Resolution : 28.28 Sampling Parameter Interval : 10 Minimum Available Sampling Int : 5 Noise Level : UNK Data Set Parameter 'RADAR-DERIVED FRESNEL REFLECTIVITY' ------------------------------------------------------- The Fresnel reflectivity of a surface derived by modeling backscatter crosssection as a function of surface RMS slope and Fresnel reflectivity. This value is related to the (complex) surface bulk dielectric constant E by ((sqrt(E)-1)/(sqrt(E)+1))**2. Data Set Parameter Name : RADAR-DERIVED FRESNEL REFLECTIVITY Data Set Parameter Unit : DIMENSIONLESS Sampling Parameter Name : ALONG TRACK DISTANCE Sampling Parameter Unit : KILOMETER Minimum Sampling Parameter : N/A Maximum Sampling Parameter : N/A Sampling Parameter Resolution : 28.28 Sampling Parameter Interval : 10 Minimum Available Sampling Int : 5 Noise Level : UNK Data Set Parameter 'RADAR-DERIVED SURFACE ROUGHNESS' ---------------------------------------------------- The average surface slope derived from radar measurements, for a horizontal length scale that varies with the radar wavelength and incidence angle. Data Set Parameter Name : RADAR-DERIVED SURFACE ROUGHNESS Data Set Parameter Unit : RADIAN Sampling Parameter Name : ALONG TRACK DISTANCE Sampling Parameter Unit : KILOMETER Minimum Sampling Parameter : N/A Maximum Sampling Parameter : N/A Sampling Parameter Resolution : 28.28 Sampling Parameter Interval : 10 Minimum Available Sampling Int : 5 Noise Level : UNK Source Instrument Parameters : Instrument Host ID : MGN Data Set Parameter Name : EMISSIVITY Instrument Parameter Name : RADIANT POWER Important Instrument Parameters : 1 Instrument Host ID : MGN Data Set Parameter Name : PLANETARY RADIUS Instrument Parameter Name : RADAR ECHO POWER Important Instrument Parameters : 1 Instrument Host ID : MGN Data Set Parameter Name : BRIGHTNESS TEMPERATURE Instrument Parameter Name : RADIANT POWER Important Instrument Parameters : 1 Instrument Host ID : MGN Data Set Parameter Name : RADAR-DERIVED SURFACE ROUGHNESS Instrument Parameter Name : RADAR ECHO POWER Important Instrument Parameters : 1 Instrument Host ID : MGN Data Set Parameter Name : RADAR-DERIVED FRESNEL REFLECTIVITY Instrument Parameter Name : RADAR ECHO POWER Important Instrument Parameters : 1 Processing : Processing History ------------------ Source Data Set ID : MGN-V-RDRS-2-EDR-ALTIMETER-V1.0 Software : MGMALT Product Data Set ID : MGN-V-RDRS-5-CDR-ALT/RAD-V1.0 Software 'MGMALT' ----------------- The MIT Altimetry and Radiometry Data Reduction Software (MGMALT) was designed to ingest Altimetry Experiment Data Records, conduct range and Doppler processing on the data, and solve for radius, surface reflectivity, and meter-scale roughness by matching the returned signals against a library of echo templates calculated from Hagfors' model of quasi-specular scattering. The software also estimates brightness temperature and emissivity from the radiometry mode of the Magellan high gain antenna. This software will b released to Magellan Data Management Archive Team (DMAT) upo the completion of the nominal mission. Software Name : MGMALT Software Type : N/A Software Release Date : N/A Node ID : N/A Cognizant Engineer : DR. PETER FORD Software Access Description : N/A
DATA_SET_RELEASE_DATE 1992-05-15T00:00:00.000Z
START_TIME 1990-09-15T04:22:14.871Z
STOP_TIME 1992-09-12T02:27:41.936Z
MISSION_NAME MAGELLAN
MISSION_START_DATE 1989-05-04T12:00:00.000Z
MISSION_STOP_DATE 1994-10-12T12:00:00.000Z
TARGET_NAME VENUS
TARGET_TYPE PLANET
INSTRUMENT_HOST_ID MGN
INSTRUMENT_NAME RADAR SYSTEM
INSTRUMENT_ID RDRS
INSTRUMENT_TYPE RADAR
NODE_NAME Geosciences
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Overview : UNKNOWN
CITATION_DESCRIPTION Ford, P. G., MGN V RDRS 5 COMPOSITE DATA RECORD ALT/RAD V1.0, MGN-V-RDRS-5-CDR-ALT/RAD-V1.0, NASA Planetary Data System, 1992
ABSTRACT_TEXT This data set contains the Magellan Altimetry/Radiometry Composite Data Record (ARCDR). Along track estimates of elevation, Fresnel Reflectivity, surface roughness, brightness temperature, emissivity derived from Magellan altimeter and radiometer data.
PRODUCER_FULL_NAME PETER G. FORD
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