urn:nasa:pds:vl_image_raw:miscellaneous:vl2_catalog 1.0 1.21.0.0 Product_Ancillary 2024-06-12 1.0 Initial version. 1976-07-20Z 1982-12-31Z Viking Mission urn:nasa:pds:context:investigation:mission.viking ancillary_to_investigation Viking Lander 2 Host urn:nasa:pds:context:instrument_host:spacecraft.vl2 is_instrument_host Camera 1 for VL2 Instrument urn:nasa:pds:context:instrument:cam1.vl2 is_instrument Camera 2 for VL2 Instrument urn:nasa:pds:context:instrument:cam2.vl2 is_instrument Mars Planet urn:nasa:pds:context:target:planet.mars ancillary_to_target Phobos Satellite urn:nasa:pds:context:target:satellite.mars.phobos ancillary_to_target Deimos Satellite urn:nasa:pds:context:target:satellite.mars.deimos ancillary_to_target Sun Star urn:nasa:pds:context:target:star.sun ancillary_to_target Calibration Calibrator urn:nasa:pds:context:target:calibrator.calibration ancillary_to_target vl2_catalog.csv 2024-05-31 0 PDS DSV 1 Index table of products in the Viking Lander image dataset. 3043 Carriage-Return Line-Feed Comma 21 0 image_event 1 ASCII_String Image event is a term used by the imaging team to identify images. It is included in the catalog for sorting records. It consists of the camera event ID without the lander and camera numbers and also includes a 3 character code for the diode used. The two parts are separated by an underscore character. logical_identifier 2 ASCII_String The logical_identifier [LID] for the product. file_name 3 ASCII_String File name for the image. lander 4 ASCII_Integer The Viking Lander number that acquired the image. camera 5 ASCII_Integer The camera number that acquired the image. start_time 6 ASCII_Date_Time_YMD_UTC The UTC time at the start of imaging. target_name 7 ASCII_String The primary target of the image. Possible values are: Mars, Sun, Phobos, Deimos, or Calibration. Target names of Mars are either images of the surface, sky, or lander parts. Calibration images are either internal radiometric measurements or verification of the camera scanning mechanisms. mission_phase 8 ASCII_String Mission_phase identifies a time period within the mission. sol_number 9 ASCII_Integer Sol_number is the number of Mars day on which an image was acquired. Landing day is Sol 0. local_hour 10 ASCII_Real The hour and fraction hour within a sol for the start of an image assuming a sol has 24 hours. This definition is unique to Viking Lander data. diode 11 ASCII_String Name for one of the twelve photodiodes in a VL camera that was used to acquire the image. product_type_name 12 ASCII_String Product_type_name identifies the type of image based on instrument-specific settings. scan_start_azimuth 13 ASCII_Real degree Beginning azimuth of an image scan. Values are in the camera-aligned camera coordinate system (CACCS). The zero azimuth for each camera generally points towards the other camera. scan_stop_azimuth 14 ASCII_Real degree Ending azimuth of an image scan. Values are in the camera-aligned camera coordinate system (CACCS). The zero azimuth for each camera generally points towards the other camera mirror_center_elevation 15 ASCII_Real degree The commanded center elevation of the scanning mirror used for acquireing an image. Zero elevation generally pointed toward the horizon with negative values below and positive values above the horizon. Note that actual center elevation may be different for some non-nominal imaging modes. sampling_interval 16 ASCII_Real degree The spacing in degrees between pixels within a scan line and between scan lines. rescan_start_sample 17 ASCII_Integer The VL camera could collect data without advancing the azimuth. This mode was called rescan, i.e., repeating the same vertical scan of data. This sometimes happened at the end of image. It was sometimes commanded to repeat vertical scans to study atmospheric properties or to detect surface changes. Rescan_start_sample is the sample value where rescan starts in an image. The value is zero if there was no rescan. rescan_total_samples 18 ASCII_Integer The VL camera could collect data without advancing the azimuth. This was called rescan, i.e., repeating the same vertical scan of data. This sometimes happened at the end of image. It was sometimes commanded to repeat vertical scans. Rescan_total_samples is the total number of repeated scans in an image. The value is zero if there was no rescan. missing_scans 19 ASCII_Integer Missing_samples is the number of vertical scans that are missing from an image. Vertical scans of data were sometimes lost in transmission to Earth or if there were noise or errors in the telemetry such that scans could not be extracted from the downlink. A value of zero means no scans were lost. dust_flag 20 ASCII_String A flag indicating whether a dust sequence was done with an image. The cameras could be commanded to spray a stream of CO2 across the outer window of the camera to remove accumulated dust. A value of true means a dusting was done. The value is false for most images. observation_name 21 ASCII_String A note indicating the reason for acquiring the image.