OBJECT = COLUMN NAME = SFDU_LABEL_AND_LENGTH START_BYTE = 1 DATA_TYPE = CHARACTER BYTES = 20 UNIT = 'N/A' OBJECT = ALIAS NAME = RR_SFDU USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The SFDU_label_and_length element identifies the label and length of the Standard Format Data Unit (SFDU)." END_OBJECT OBJECT = COLUMN NAME = RAD_NUMBER START_BYTE = 21 DATA_TYPE = LSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS NAME = RR_BURST USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The rad_number element provides the value of the number assigned to the burst header that contains the radiometer measurement referenced by this element." END_OBJECT OBJECT = COLUMN NAME = RAD_FLAG_GROUP START_BYTE = 25 DATA_TYPE = LSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS NAME = RR_FLAG USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The RAD_FLAG_GROUP element identifies the following flag fields. RR_GEOC=0x0001 Geometry values have been corrected for ephemeris errors in the phase. RR_RADC=0x0002 The average_planetary_radius value has been corrected by altimeter radius values. RR_NOS1=0x0004 sar_average_backscatter[0] value missing. RR_NOS2=0x0008 sar_average_backscatter[1] value missing. RR_BAD=0x0010 The elements brightness_temperature, average_planetary_radius, planet_reading_system_temp, assumed_warm_sky_temperature, rad_receiver_system_temp, surface_emission_temperature, and surface_emissivity, and surface_temperature should be ignored. RR_CAL=0x0020 The spacecraft is operating in its 'radiometric calibration' mode, in which the SAR boresight is pointed away from the planet. The rad_footprint_latitude and rad_footprint_longitude fields contain the boresight latitude and longitude in the inertial (J2000) coordinate system, not in VBF85. RR_NRAD=0x0040 The average_planetary_radius value could not be estimated from the topography model. RR_RAD2=0x0080 This record was created under software version 2 or higher, in which elements rad_emissivity_partial, surface_temperature, raw_rad_antenna_power, raw_rad_load_power, alt_skip_factor, alt_gain_factor, and alt_coarse_resolution are significant." END_OBJECT OBJECT = COLUMN NAME = RAD_FLAG2_GROUP START_BYTE = 29 DATA_TYPE = LSB_UNSIGNED_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS NAME = RR_FLAG2 USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " Additional flag fields (unused)." END_OBJECT OBJECT = COLUMN NAME = RAD_SPACECRAFT_EPOCH_TDB_TIME START_BYTE = 33 DATA_TYPE = VAX_REAL BYTES = 8 UNIT = 'N/A' OBJECT = ALIAS NAME = RR_SCET USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The rad_spacecraft_epoch_tdb_time element provides the value of the ephemeris time at which the radiometry measurement was made." END_OBJECT OBJECT = COLUMN NAME = RAD_SPACECRAFT_POSITION_VECTOR START_BYTE = 41 DATA_TYPE = VAX_REAL BYTES = 8 ITEMS = 3 UNIT = km OBJECT = ALIAS NAME = RR_POS USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The rad_spacecraft_position_vector element provides the value of the spacecraft position at rad_spacecraft_epoch_tdb_time, relative to the Venus center of mass, expressed in inertial coordinates in the J2000 coordinate system." END_OBJECT OBJECT = COLUMN NAME = RAD_SPACECRAFT_VELOCITY_VECTOR START_BYTE = 65 DATA_TYPE = VAX_REAL BYTES = 8 ITEMS = 3 UNIT = 'km/s' OBJECT = ALIAS NAME = RR_VEL USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The rad_spacecraft_velocity_vector element provides the value of the spacecraft velocity at rad_spacecraft_epoch_tdb_time, relative to the Venus center of mass, expressed in inertial coordinates in the J2000 coordinate system." END_OBJECT OBJECT = COLUMN NAME = RAD_FOOTPRINT_LONGITUDE START_BYTE = 89 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = deg OBJECT = ALIAS NAME = RR_LON USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The rad_footprint_longitude (VBF85) element provides the crust-fixed longitude, at rad_spacecraft_epoch_tdb_time, of the intersection of the antenna boresight and the planetary surface (a sphere of radius average_planetary_radius)." END_OBJECT OBJECT = COLUMN NAME = RAD_FOOTPRINT_LATITUDE START_BYTE = 93 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = deg OBJECT = ALIAS NAME = RR_LAT USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The rad_footprint_latitude (VBF85) element provides the value of the crust-fixed latitude, at rad_spacecraft_epoch_tdb_time, of the intersection of the antenna boresight and the planetary surface (a sphere of radius average_planetary_radius element)." END_OBJECT OBJECT = COLUMN NAME = RAD_ALONG_TRACK_FOOTPRINT_SIZE START_BYTE = 97 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = km OBJECT = ALIAS NAME = RR_XFOOT USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The rad_along_track_footprint_size provides the value of the along track dimension of the intersection of the SAR antenna (3dB one-way attenuation) cone with a sphere of radius average_planetary_radius." END_OBJECT OBJECT = COLUMN NAME = RAD_CROSS_TRACK_FOOTPRINT_SIZE START_BYTE = 101 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = km OBJECT = ALIAS NAME = RR_YFOOT USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The rad_cross_track_footprint_size element provides the value of the cross track dimension of the intersection of the SAR antenna (3dB one-way attenuation) cone with a sphere of radius average_planetary_radius." END_OBJECT OBJECT = COLUMN NAME = SAR_FOOTPRINT_SIZE START_BYTE = 105 DATA_TYPE = VAX_REAL BYTES = 4 ITEMS = 2 UNIT = km OBJECT = ALIAS NAME = RR_SFOOT USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The sar_footprint_size element provides the value of the approximate diameter of the surface footprint represented by the SAR backscatter values which are provided by the sar_average_backscatter element." END_OBJECT OBJECT = COLUMN NAME = SAR_AVERAGE_BACKSCATTER START_BYTE = 113 DATA_TYPE = VAX_REAL BYTES = 4 ITEMS = 2 UNIT = dB OBJECT = ALIAS NAME = RR_SAR USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The sar_average_backscatter element provides the values of a pair of running averages of SAR image pixel values, sar_average_backscatter[0] taken from pixels lying westward of the antenna boresight, and sar_average_backscatter[1] taken from pixels lying to the east of it." END_OBJECT OBJECT = COLUMN NAME = INCIDENCE_ANGLE START_BYTE = 121 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = deg OBJECT = ALIAS NAME = RR_ANGLE USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The incidence_angle element provides the value of the angle between the local vertical and the spacecraft direction, measured at the center of the radiometer footprint at rad_spacecraft_epoch_event_time." END_OBJECT OBJECT = COLUMN NAME = BRIGHTNESS_TEMPERATURE START_BYTE = 125 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = K OBJECT = ALIAS NAME = RR_BRIGHT USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The brightness_temperature element provides the value of the planet brightness temperature, derived from the planet_reading_system_temp after correcting for antenna efficiency and side-lobe gain." END_OBJECT OBJECT = COLUMN NAME = AVERAGE_PLANETARY_RADIUS START_BYTE = 129 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = km OBJECT = ALIAS NAME = RR_RADIUS USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The average_planetary_radius element provides the value of the planetary radius of the radiometer footprint, used to compute rad_footprint_longitude and rad_footprint_latitude, and also surface_temperature and atmospheric corrections to surface_emissivity." END_OBJECT OBJECT = COLUMN NAME = PLANET_READING_SYSTEM_TEMP START_BYTE = 133 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = K OBJECT = ALIAS NAME = RR_ANTTEMP USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The planet_reading_system_temp element provides the value of the raw radiometer reading, when switched into the SAR antenna, converted to equivalent noise temperature." END_OBJECT OBJECT = COLUMN NAME = ASSUMED_WARM_SKY_TEMPERATURE START_BYTE = 137 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = K OBJECT = ALIAS NAME = RR_SKYTEMP USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The assumed_warm_sky_temperature element provides the value of the temperature assumed for the dominant portion of 'sky' reflected by the radiometer footprint, including atmospheric absorption and emission." END_OBJECT OBJECT = COLUMN NAME = RAD_RECEIVER_SYSTEM_TEMP START_BYTE = 141 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = K OBJECT = ALIAS NAME = RR_RCVRTEMP USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The rad_receiver_system_temp element provides the value of the receiver input radiometer reading, converted to equivalent noise temperature. This is the difference between raw_rad_antenna_power and raw_rad_load_power, converted to equivalent noise temperature and compensated for changes in receiver gain and temperature." END_OBJECT OBJECT = COLUMN NAME = SURFACE_EMISSION_TEMPERATURE START_BYTE = 145 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = K OBJECT = ALIAS NAME = RR_SURFTEMP USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The surface_emission_temperature element provides the value of the temperature assumed for the planetary surface covered by the radiometer footprint, derived by correcting brightness_temperature for atmospheric emission and absorption." END_OBJECT OBJECT = COLUMN NAME = SURFACE_EMISSIVITY START_BYTE = 149 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS NAME = RR_EMISS USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The surface_emissivity element provides the value of surface microwave emissivity, calculated by dividing (surface_emission_temperature - assumed_warm_sky_temperature) by (physical_surface_temperature - assumed_warm_sky_temperature)." END_OBJECT OBJECT = COLUMN NAME = RAD_PARTIALS_GROUP START_BYTE = 153 DATA_TYPE = VAX_REAL BYTES = 4 ITEMS = 18 UNIT = 'N/A' OBJECT = ALIAS NAME = RR_PARTL USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The rad_partials_group element provides the value of the partials of the rad_footprint_latitude, the rad_footprint_longitude, and the average_planetary_radius elements with respect to the rad_spacecraft_position_vector and rad_spacecraft_velocity_vector elements." END_OBJECT OBJECT = COLUMN NAME = RAD_EMISSIVITY_PARTIAL START_BYTE = 225 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = 'km**(-1)' OBJECT = ALIAS NAME = RR_DEDRAD USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The rad_emissivity_partial element provides the value of the partial derivative of surface_emissivity with respect to average_planetary_radius." END_OBJECT OBJECT = COLUMN NAME = SURFACE_TEMPERATURE START_BYTE = 229 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = K OBJECT = ALIAS NAME = RR_PHYSTEMP USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The surface_temperature element provides the value of the physical surface temperature of the radiometer footprint, calculated from average_planetary_radius and the project-adopted atmospheric model." END_OBJECT OBJECT = COLUMN NAME = RAW_RAD_ANTENNA_POWER START_BYTE = 233 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS NAME = RR_ANTVAL USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The raw_rad_antenna_power element provides the value of the radiometer noise power when the receiver is connected to the SAR antenna. It is corrected for systematic errors resulting from leakage of the altimeter signal." END_OBJECT OBJECT = COLUMN NAME = RAW_RAD_LOAD_POWER START_BYTE = 237 DATA_TYPE = VAX_REAL BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS NAME = RR_LOADVAL USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The raw_rad_load_power element provides the value of the radiometer noise power when the receiver is connected to a load at a known temperature. It is averaged over as many as 10 successive measurements and corrected for systematic errors resulting from leakage of the altimeter signal." END_OBJECT OBJECT = COLUMN NAME = ALT_SKIP_FACTOR START_BYTE = 241 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 ITEMS = 2 UNIT = 'N/A' OBJECT = ALIAS NAME = RR_ASKIP USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The alt_skip_factor elements provide the values of the altimeter skip factor taken from the radar burst header. alt_skip_factor[0] pertains to the measurement of raw_rad_antenna_power and alt_skip_factor[1] to raw_rad_load_power." END_OBJECT OBJECT = COLUMN NAME = ALT_GAIN_FACTOR START_BYTE = 243 DATA_TYPE = UNSIGNED_INTEGER BYTES = 1 ITEMS = 2 UNIT = 'N/A' OBJECT = ALIAS NAME = RR_AGAIN USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The alt_gain_factor elements provide the values of the altimeter gain factor taken from the radar burst header. alt_gain_factor[0] pertains to the measurement of raw_rad_antenna_power and alt_gain_factor[1] to raw_rad_load_power." END_OBJECT OBJECT = COLUMN NAME = ALT_COARSE_RESOLUTION START_BYTE = 245 DATA_TYPE = LSB_INTEGER BYTES = 4 UNIT = 'N/A' OBJECT = ALIAS NAME = RR_ACR USAGE_NOTE = "MAGELLAN MIT ARCDR SIS" END_OBJECT DESCRIPTION = " The alt_coarse_resolution element provides the value of the altimeter coarse time resolution factor taken from the radar burst header in which the raw_rad_antenna_power was reported." END_OBJECT