Glossary: HiRISE

ALL

  • Center Latitude
    • Center latitude of the map projection. This does not necessarily equal the center latitude of the image.
  • Center Longitude
    • Center longitude of the map projection. This does not necessarily equal the center longitude of the image.
  • Corner1 Latitude
    • Latitude of corner 1 of the projected image
  • Corner 1 Longitude
    • Longitude of corner 1 of the projected image
  • Corner 2 Latitude
    • Latitude of corner 2 of the projected image
  • Corner2 Longitude
    • Longitude of corner 2 of the projected image
  • Corner3 Latitude
    • Latitude of corner 3 of the projected image
  • Corner 3 Longitude
    • Longitude of corner 3 of the projected image
  • Corner 4 Latitude
    • Latitude of corner 4 of the projected image
  • Corner 4 Longitude
    • Longitude of corner 4 of the projected image
  • Description
    • Informational note about the observation
  • Emission Angle
    • The emission angle at the center of the observation
  • File Name Specification
    • Path and file name of HiRISE RDR product
  • Image ID
    • Unique identification associated with the product
  • Incidence Angle
    • Calculated for the center of each image, this is the angle between the Sun and a line drawn normal to the surface of the planet at the time the image was acquired. An angle of 0 degrees means the Sun is directly overhead and an angle of 90 degrees means the Sun is on the horizon. Daytime infrared images typically have incidence angles between approximately 0-90 degrees and nighttime infrared images typically have incidence angles greater than 90 degrees.
  • Instrument Host Id
    • Spacecraft hosting the HiRISE instrument, always MRO
  • Instrument Id
    • Instrument that acquired the observaiton, always HIRISE
  • Latitude (North)
    • This is the approximate latitude on the planet Mars of the image center. All values are based on the IAU 2000 aerocentric model of Mars with east positive longitude.
  • Line Projection Offset
    • The line_projection_offset element provides the line offset value of the map projection origin position from the line and sample 1,1 (line and sample 1,1 is considered the upper left corner of the digital array).
  • Lines
    • Number of image lines
  • Line Samples
    • Number of line samples
  • Local Time
    • Local Solar Time in decimal hours from midnight at the center of the observation
  • Longitude (East)
    • This is the approximate longitude on the planet Mars of the image center. All values are based on the IAU 2000 aerocentric model of Mars with east positive longitude.
  • Map Projection Type
    • EQUIRECTANGULAR or POLAR STEREOGRAPHIC
  • Map Resolution
    • Map resolution in pixels per degree
  • Map Scale
    • Map scale in meters per pixel
  • Maximum Latitude
    • Maximum latitude of the projected image
  • Maximum Longitude
    • Maximum longitude of projected image
  • Minimum Latitude
    • Minimum latitude of the projected image
  • Minimum Longitude
    • Minimum longitude of the projected image.
  • Mission Phase
    • Mission Phase at time of observation, such as Primary Science Phase
  • North Azimuth
    • The clockwise angle from an imaginary three o'clock axis with the origin at the center of a pixel at the center of the image.
  • Observation Id
    • Unique identification associated with an observation. Up to 28 EDR products can be associated with an observation.
  • Observation Start Count
    • Spacecraft clock count when HiRISE started the imaging sequence
  • Observation Start Time
    • UTC time when HiRISE started the imaging sequence
  • Orbit
    • Spacecraft orbit during which this image was observed.
  • Phase Angle
    • The phase angle at the center of the observation
  • Product Version Id
    • Version number of this product
  • Sample Projection Offset
    • The sample_projection_offset element provides the sample offset value of the map projection origin position from line and sample 1,1 (line and sample 1,1 is considered the upper left corner of the digital array). Note: that the positive direction is to the right and down.
  • Slant Distance
    • This number is similar to the spacecraft altitude, but also takes into account the emission angle; if the emission angle is 0 then this number is the same as the spacecraft altitude. If the emission angle is much greater than 0, then the "slant distance" to the surface at the center of the image is also greater than the spacecraft altitude.
  • Solar Distance
    • The distance from the center of the image on the target body to the center of the Sun in AU
  • Solar Longitude
    • This is the position of Mars relative to the Sun measured in degrees from the vernal equinox (start of northern Spring). This number is used as a measure of martian seasons:
      • Northern Spring/Southern Autumn start at 0°
      • Northern Summer/Southern Winter start at 90°
      • Northern Autumn/Southern Spring start at 180°
      • Northern Winter/Southern Summer begin at 270°
      Also known as heliocentric longitude and abbreviated Ls.
  • Spacecraft Altitude
    • The areodetic altitude of the center of the observation in kilometers. This field represents the center altitude for the observation on the MRO ellipsoid reference.
  • Spacecraft Clock Start Count
    • Spacecraft clock count when first image line of target was acquired
  • Spacecraft Clock Stop Count
    • Spacecraft clock count when last image line of target was acquired
  • Start Time
    • UTC time when first image line of target was acquired
  • Stereo Flag
    • Indicates whether this product was intended to be part of a stereo pair. (YES or NO).
  • Stop Time
    • UTC time when last image line of target was acquired
  • Subsolar Azimuth
    • The angel in degrees clockwise from the reference axis of the observation (a line from the center to the right edge of the observation) to the direction to the sub-solar point on the target body.
  • Subsolar Latitude
    • The planetocentric latitude of the sub-solar point in degrees
  • Subsolar Longitude
    • The east longitude of the sub-solar point in degrees
  • Subspacecraft Latitude
    • The planetocentric latitude of the sub-spacecraft point in degrees
  • Subspacecraft Longitude
    • The planetocentric longitude of the sub-spacecraft point in degrees
  • Target Center Distance
    • The distance from the spacecraft to the target body's center in kilometers
  • Target Name
    • Target Name of the observation
  • Volume Id
    • Volume identification