OBJECT = DATASET DATA_SET_ID = 'MGN-V-RDRS-5-GDR-EMISSIVITY-V1.0' OBJECT = DATASETINFO DATA_SET_NAME = 'MGN V RDRS 5 GLOBAL DATA RECORD EMISSIVITY V1.0' DATA_SET_COLLECTION_MEMBER_FLG = N EVENT_START_TIME = 1990-09-15T16:22:15.591 EVENT_STOP_TIME = 1992-09-14T02:27:38.204 NATIVE_START_TIME = 'N/A' NATIVE_STOP_TIME = 'N/A' DATA_OBJECT_TYPE = 'IMAGE' DATA_SET_RELEASE_DATE = 1992-01-15 PROCESSING_LEVEL_ID = 5 PRODUCER_FULL_NAME = 'Peter G. Ford' PRODUCER_INSTITUTION_NAME = "Massachusetts Institute of Technology" SOFTWARE_FLAG = N DETAILED_CATALOG_FLAG = N PROCESSING_START_TIME = 1991-03-27T16:00:15 PROCESSING_STOP_TIME = 1992-12-03T16:31:04 DATA_SET_DESC = "Global Emissivity Data Record (GEDR). The emissivity of a surface is defined as the thermal power emitted by that surface divided by the power emitted by a black body of the same size and at the same physical temperature. The polarization direction is horizontal (E-field tangential to surface), and the emissivity is not corrected for emission angle or surface roughness or tilt. This data set includes all Magellan measurements in which the high-gain antenna followed the nominal look-angle profile, in which the observed emission angle varied from 48 degrees off the local vertical at periapsis (ca. 10N latitude) to 15 degrees off vertical at the 90N and 70S. To make the GEDR images, Magellan radiometer data, in the form of readings of antenna noise temperature, are corrected for antenna sidelobe effects and for emission and absorption by the Venus atmosphere. The component reflected from the surface is modeled as a specular reflection with power reflection coefficient equal to (1 - emissivity). The location and planetary radius at the antenna boresight intercept point are derived from GTDR images and the physical surface temperature is calculated using the adiabatic model of Kliore et al., 1985. The data are then filtered to remove low-frequency instrument calibration errors, and re-sampled into sinusoidal, Mercator, and north and south polar stereographic projections at a resolution of about 5x5 kilometers per pixel. Each GEDR image pixel is represented by a 16-bit integer. In sinusoidal images, pixels lying outside the domain of the projection are set to zero. In all images, pixels with unknown or unmeasured values are also set to zero. The remaining values are related to the emissivity by the following equation: DN = (EMISSIVITY * 10000) + 1 See: Software Interface Specification Document (Peter G. Ford, 1991, Global Altimetry and Radiometry Data Records, MIT-MGN-GxDR SIS Version 2.3, 40 p.) that is included on GxDR CD-ROMs. Note: There exist photoproducts that are identified as GxDRP (where x is E (Emissivity), S (Slope), RE (Reflectivity), or T (Topography)) however, they are not generated from the digital GxDR products. They are instead produced from the Magellan ARCDR (Altimetry and Radiometry Composite Data Record) data files." CONFIDENCE_LEVEL_NOTE = 'UNK' END_OBJECT = DATASETINFO OBJECT = DATASETTARG TARGET_NAME = 'VENUS' END_OBJECT = DATASETTARG OBJECT = DSPARMINFO SAMPLING_PARAMETER_NAME = 'PIXEL' SAMPLING_PARAMETER_RESOLUTION = 9282 MINIMUM_SAMPLING_PARAMETER = 'N/A' MAXIMUM_SAMPLING_PARAMETER = 'N/A' SAMPLING_PARAMETER_INTERVAL = 4641 MINIMUM_AVAILABLE_SAMPLING_INT = 'N/A' SAMPLING_PARAMETER_UNIT = 'METER' DATA_SET_PARAMETER_NAME = 'EMISSIVITY' NOISE_LEVEL = 'UNK' DATA_SET_PARAMETER_UNIT = 'DIMENSIONLESS' END_OBJECT = DSPARMINFO OBJECT = SCDSHOST INSTRUMENT_HOST_ID = 'MGN' INSTRUMENT_ID = 'RDRS' END_OBJECT = SCDSHOST OBJECT = DSREFINFO REFERENCE_KEY_ID = 'FORD1991' OBJECT = REFERENCE DOCUMENT_TOPIC_TYPE = 'Software Interface Specification' JOURNAL_NAME = 'Project Magellan SIS Document' PUBLICATION_DATE = 1991 REFERENCE_DESC = "Peter G. Ford, Global Altimetry and Radiometry Data Record, Project Magellan Software Interface Specification Document MIT-MGN-GxDR, 1991 Version 2.3, 40p." OBJECT = REFAUTHORS AUTHOR_FULL_NAME = 'Peter G. Ford' END_OBJECT = REFAUTHORS END_OBJECT = REFERENCE END_OBJECT = DSREFINFO OBJECT = DSREFINFO REFERENCE_KEY_ID = SAUNDERSETAL1990 OBJECT = REFERENCE DOCUMENT_TOPIC_TYPE = 'Mission Science' JOURNAL_NAME = 'Journal of Geophysical Research' PUBLICATION_DATE = 1990 REFERENCE_DESC = "Saunders, R.S., G.H. Pettengill, R.E. Arvidson, W.L. Sjogren, W.T.K. Johnson, L. Pieri, The Magellan Venus Radar Mapping Mission, Journal of Geophysical Research, 1990, Vol 95, pp. 8339-8335" OBJECT = REFAUTHORS AUTHOR_FULL_NAME = 'R. Stephen Saunders' END_OBJECT = REFAUTHORS OBJECT = REFAUTHORS AUTHOR_FULL_NAME = 'Gordon H. Pettengill' END_OBJECT = REFAUTHORS OBJECT = REFAUTHORS AUTHOR_FULL_NAME = 'Raymond E. Arvidson' END_OBJECT = REFAUTHORS OBJECT = REFAUTHORS AUTHOR_FULL_NAME = 'William T. K. Johnson' END_OBJECT = REFAUTHORS OBJECT = REFAUTHORS AUTHOR_FULL_NAME = 'Leslie J. Pieri' END_OBJECT = REFAUTHORS END_OBJECT = REFERENCE END_OBJECT = DSREFINFO OBJECT = DSREFINFO REFERENCE_KEY_ID = PETTENGILLETAL1992 OBJECT = REFERENCE DOCUMENT_TOPIC_TYPE = 'Mission Science' JOURNAL_NAME = 'Journal of Geophysical Research' PUBLICATION_DATE = 1992 REFERENCE_DESC = "Pettengill, G.H., P.G. Ford, and R.J. Wilt, Venus Surface Radiothermal Emission as Observed by Magellan, Journal of Geophysical Research, 1992, Vol 97, pp. 13091-13102" OBJECT = REFAUTHORS AUTHOR_FULL_NAME = 'Gordon H. Pettengill' END_OBJECT = REFAUTHORS OBJECT = REFAUTHORS AUTHOR_FULL_NAME = 'Peter G. Ford' END_OBJECT = REFAUTHORS OBJECT = REFAUTHORS AUTHOR_FULL_NAME = 'Robert J. Wilt' END_OBJECT = REFAUTHORS END_OBJECT = REFERENCE END_OBJECT = DSREFINFO END_OBJECT = DATASET END