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Data Set Information
DATA_SET_NAME VO1/VO2 MARS VISUAL IMAGING SS EXPRMNT DATA REC BROWSE V2.0
DATA_SET_ID VO1/VO2-M-VIS-2-EDR-BR-V2.0
NSSDC_DATA_SET_ID
DATA_SET_TERSE_DESCRIPTION
DATA_SET_DESCRIPTION Data Set Overview : This data set includes sub-sampled versions of Viking Orbiter images that are intended to facilitate rapid viewing of the image collection. The image data in these browse images have been reduced in size by sub-sampling the original image by a factor of 4 in both lines and samples. Thus, the data volume has been reduced by a factor of 16. A Viking Orbiter browse image contains 264 lines and 300 samples. A filtering procedure was used in generating the browse images because Viking Orbiter images commonly contain noisy data or are missing data. The brightness value of a pixel in a browse image is the median brightness value of an array of 4 by 4 pixels from the original image. If the 4 by 4 array of original pixels contained zero values, those zero value pixels were not used in determining the median value. Of course, if the entire 4 by 4 array contained zero value pixels, the corresponding pixel in the browse image was assigned a zero value. The browse image data set is meant to support the use of the full-resolution EDR image data set. Images from both the former ('VO1/VO2-M-VIS-2-EDR-BR-V2.0') and the latter ('VO1/VO2-M-VIS-2-EDR-V2.0') are available on a set of CD-ROM discs. Each disc contains a selection of images presented in both browse and compressed formats. Processing Level Id : 2 Software Flag : N Processing Start Time : 1990-11-01 Processing Stop Time : UNK Parameters : Description ----------- Data Number is an integer expressing the digital value of an experiment's telemetry data. Sampling Parameter Name : PIXEL Data Set Parameter Name : DATA NUMBER Data Set Parameter Unit : DIMENSIONLESS Noise Level : UNK Source Instrument Parameters : Instrument Host ID : VO1 Data Set Parameter Name : DATA NUMBER Instrument Parameter Name : RADIANCE Important Instrument Parameters : 1 Instrument Host ID : VO2 Data Set Parameter Name : DATA NUMBER Instrument Parameter Name : RADIANCE Important Instrument Parameters : 1 Processing : Processing History ------------------ Source Data Set ID : VO1/VO2-M-VIS-2-EDR-V2.0 Software : MAKE BROWSE Product Data Set ID : VO1/VO2-M-VIS-2-EDR-BR-V2.0 Software 'MAKE BROWSE' ---------------------- This program decompresses a compressed Viking Orbiter image and computes the median brightness value for each 4 by 4 array of pixels in the full-resolution image. The result is a reduced resolution image with most of the noise removed. The following rules are used in determining the brightness value of a pixel in a browse image. The brightness value of a pixel in a browse image is the median brightness value of an array of 4 by 4 pixels from the original image. If the 4 by 4 array of original pixels contain zero values, those zero value pixels are not used in determining the median value. Of course, if the entire 4 by 4 array contains zero value pixels, the corresponding pixel in the browse image is assigned a zero value. Software Name : MAKE BROWSE Software Type : N/A Software Release Date : 1990-01-01 Node ID : IMAGING Cognizant Engineer : ERIC ELIASON Software Access Description : N/A
DATA_SET_RELEASE_DATE 1990-12-01T00:00:00.000Z
START_TIME 1976-06-22T05:59:00.046Z
STOP_TIME 1980-07-30T10:14:59.046Z
MISSION_NAME VIKING
MISSION_START_DATE 1975-08-20T12:00:00.000Z
MISSION_STOP_DATE 1983-02-01T12:00:00.000Z
TARGET_NAME MARS
DEIMOS
PHOBOS
STAR
TARGET_TYPE PLANET
SATELLITE
STAR
INSTRUMENT_HOST_ID VO1
VO2
INSTRUMENT_NAME VISUAL IMAGING SUBSYSTEM - CAMERA A
VISUAL IMAGING SUBSYSTEM - CAMERA B
INSTRUMENT_ID VISA
VISB
INSTRUMENT_TYPE CAMERA
NODE_NAME Imaging
ARCHIVE_STATUS ARCHIVED
CONFIDENCE_LEVEL_NOTE Overview : The noise of a browse image is greatly reduced relative to the corresponding full-resolution Viking Orbiter image. However, if a large fraction of pixels in the full-resolution image are zero or noisy, the browse version may contain zero valued pixel or residual noise.
CITATION_DESCRIPTION Citation TBD
ABSTRACT_TEXT This data set includes sub-sampled versions of Viking Orbiter images that are intended to facilitate rapid viewing of the image collection. The image data in these browse images have been reduced in size by sub-sampling the original image by a factor of 4 in both lines and samples. Thus, the data volume has been reduced by a factor of 16. A Viking Orbiter browse image contains 264 lines and 300 samples. A filtering procedure was used in generating the browse images because Viking Orbiter images commonly contain noisy data or are missing data. The brightness value of a pixel in a browse image is the median brightness value of an array of 4 by 4 pixels from the original image. If the 4 by 4 array of original pixels contained zero values, those zero value pixels were not used in determining the median value. Of course, if the entire 4 by 4 array contained zero value pixels, the corresponding pixel in the browse image was assigned a zero value.
PRODUCER_FULL_NAME EDWARD A. GUINNESS
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