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HiCat Data Dictionary

Catalog: CTX
This catalog stores metadata from the MRO Context Imager (CTX). CTX provides high resolution, wide field-of-view context images for both HiRISE and CRISM observations, as well as targetting areas of scientific interest on its own. Many HiRISE observations have associated CTX observations.
Table:CTX
Data from the Context Camera (CTX) on MRO. This table only contains information on CTX products that have been released to the PDS.

Field Description Type Null Limits Size Key Default Authority Source
ID Numerical ID for each product entry in the table. INT(11) Not Null unique index Database Server
VOLUME_ID The PDS Volume ID VARCHAR(9) PDS cumindex.tab
FILE_SPECIFICATION_NAME File path on the PDS Volume VARCHAR(35) PDS cumindex.tab
PRODUCT_ID Product ID for image. VARCHAR(26) Not Null unique index PDS cumindex.tab
IMAGE_TIME SCET time at start of image DATETIME PDS cumindex.tab
INSTRUMENT_ID The name of the instrument that produced this image product. VARCHAR(6) PDS cumindex.tab
LINE_SAMPLES image width SMALLINT(4) unsigned PDS cumindex.tab
IMAGE_LINES image height MEDIUMINT(6) unsigned PDS cumindex.tab
SPATIAL_SUMMING Spatial summing. TINYINT(2) unsigned PDS cumindex.tab
SCALED_PIXEL_WIDTH image resolution in meters/pixel at center of image FLOAT(8,2) PDS cumindex.tab
PIXEL_ASPECT_RATIO Pixel aspect ratio (pixel height/pixel width) at center of image. The image's center pixel is projected on the ground and its linear extents are ratioed, so any effects of emission angle and line time are modelled. To recover an image with 'square' pixels, the image should be resampled to a height of aspect_ratio * input height. FLOAT(6,2) PDS cumindex.tab
EMISSION_ANGLE emission angle at center of image FLOAT(6,2) PDS cumindex.tab
INCIDENCE_ANGLE incidence angle at center of image FLOAT(6,2) PDS cumindex.tab
PHASE_ANGLE phase angle at center of image FLOAT(6,2) PDS cumindex.tab
CENTER The center point of the image, stored as a GIS object. POINT Not Null PDS cumindex.tab
CENTER_LONGITUDE center longitude FLOAT(6,2) PDS cumindex.tab
CENTER_LATITUDE center areographic latitude FLOAT(6,2) PDS cumindex.tab
FOOTPRINT The image footprint, stored as a GIS object. POLYGON Not Null PDS cumindex.tab
UPPER_LEFT_LONGITUDE upper left longitude FLOAT(6,2) PDS cumindex.tab
UPPER_LEFT_LATITUDE upper left areographic latitude FLOAT(6,2) PDS cumindex.tab
UPPER_RIGHT_LONGITUDE upper right longitude FLOAT(6,2) PDS cumindex.tab
UPPER_RIGHT_LATITUDE upper right areographic latitude FLOAT(6,2) PDS cumindex.tab
LOWER_LEFT_LONGITUDE lower left longitude FLOAT(6,2) PDS cumindex.tab
LOWER_LEFT_LATITUDE lower left areographic latitude FLOAT(6,2) PDS cumindex.tab
LOWER_RIGHT_LONGITUDE lower right longitude FLOAT(6,2) PDS cumindex.tab
LOWER_RIGHT_LATITUDE lower right areographic latitude FLOAT(6,2) PDS cumindex.tab
MISSION_PHASE_NAME mission phase name VARCHAR(10) PDS cumindex.tab
TARGET_NAME target name (e.g., MARS, PHOBOS, STAR, SPACE) VARCHAR(6) PDS cumindex.tab
SPACECRAFT_CLOCK_START_COUNT spacecraft clock value at start of image VARCHAR(15) PDS cumindex.tab
FOCAL_PLANE_TEMPERATURE focal plane temp in Celsius FLOAT(5,1) PDS cumindex.tab
LINE_EXPOSURE_DURATION line integration time in milliseconds FLOAT(8,4) PDS cumindex.tab
OFFSET_MODE_ID offset mode (see documentation) VARCHAR(11) PDS cumindex.tab
SAMPLE_FIRST_PIXEL first pixel stored from detector, zero-based SMALLINT(4) unsigned PDS cumindex.tab
SCALED_IMAGE_WIDTH image width from left to right image edge in km FLOAT(7,2) PDS cumindex.tab
SCALED_IMAGE_HEIGHT image height from first line to last line in km FLOAT(8,2) PDS cumindex.tab
SPACECRAFT_ALTITUDE distance from s/c to closest point on surface in km FLOAT(7,2) PDS cumindex.tab
TARGET_CENTER_DISTANCE distance from s/c to target body center in km FLOAT(7,2) PDS cumindex.tab
SLANT_DISTANCE range from s/c to intersection of view vector with target body in km FLOAT(7,2) PDS cumindex.tab
USAGE_NOTE Because of the CTX's line-scan nature, depending on the orientation and sense of rotation of the spacecraft and the optical inversion properties of the camera system involved, MOC images can either be normal or flipped left-for-right (independent of whether the image is north up or south up.) This flag will be 'F' if the image should be flipped left-to-right, and 'N' if it is already in normal form. VARCHAR(1) PDS cumindex.tab
NORTH_AZIMUTH The angle in degrees clockwise from the reference axis of the image (a line from the center to the right edge of the image) to the direction to the north pole of the target body. If the USAGE_NOTE described previously is 'F', the image should be flipped prior to applying this angle. FLOAT(6,2) PDS cumindex.tab
SUB_SOLAR_AZIMUTH The angle in degrees clockwise from the reference axis of the image (a line from the center to the right edge of the image) to the direction to the subsolar point on the target body. If the USAGE_NOTE described previously is 'F', the image should be flipped prior to applying this angle. FLOAT(6,2) PDS cumindex.tab
SUB_SOLAR_LONGITUDE west longitude of subsolar point in degrees FLOAT(6,2) PDS cumindex.tab
SUB_SOLAR_LATITUDE planetographic latitude of subsolar point in degrees FLOAT(6,2) PDS cumindex.tab
SUB_SPACECRAFT_LONGITUDE west longitude of subspacecraft point in degrees FLOAT(6,2) PDS cumindex.tab
SUB_SPACECRAFT_LATITUDE planetographic latitude of subspacecraft point in degrees FLOAT(6,2) PDS cumindex.tab
SOLAR_DISTANCE distance from the center of the image on the target body to the center of the sun in km FLOAT(11,1) PDS cumindex.tab
SOLAR_LONGITUDE solar longitude ('L sub s') at time of image in degrees from martian vernal equinox, as computed by the method in 'Accurate analytic representations of solar time and seasons on Mars with applications to the Pathfinder/Surveyor missions', Michael Allison, Geophysical Reseach Letters 24, 16, pp 1967-1970 (August 15, 1997) FLOAT(6,2) PDS cumindex.tab
LOCAL_TIME Local True Solar Time in decimal hours from midnight at the center of the image, as computed by the method in 'Accurate analytic representations of solar time and seasons on Mars with applications to the Pathfinder/Surveyor missions', Michael Allison, Geophysical Reseach Letters 24, 16, pp 1967-1970 (August 15, 1997). An 'hour' in this context is an angular measure of 15 degrees of solar motion. FLOAT(5,2) PDS cumindex.tab
IMAGE_SKEW_ANGLE The image skew angle is the absolute value, in degrees, of the angle between the left edge (a line between the lower left and upper left corners) and the bottom edge (a line between the lower left and lower right corners) of the image, where the edges are projected on the target body. For images whose footprints are exactly rectangular, this angle will be 90 degrees. Departures from 90 degrees indicate a non-rectangular image footprint, caused by slews of the spacecraft during imaging outside the orbit plane or off-nadir pointing, or both. FLOAT(5,1) PDS cumindex.tab
RATIONALE_DESC A text description of the scientific purpose for the acquisition of this image. For routine mapping operations, this will most likely be the goal of the image as targeted (which may not be met if the image missed its target significantly, the atmosphere was cloudy, gain parameters were set inappropriately, etc.) VARCHAR(80) PDS cumindex.tab
DATA_QUALITY_DESC 'OK' if all fragments of the image are received without detected checksum or sequence errors, and 'ERRORS' otherwise. VARCHAR(6) PDS cumindex.tab
ORBIT_NUMBER orbit number as defined by the MGS Project MEDIUMINT(5) unsigned PDS cumindex.tab
LAST_UPDATE This column records the last time that a record was updated. TIMESTAMP db server

  • Field: the field name within the table.
  • Description: the definition for the field.
  • Type: the data type of the field.
  • Null: whether the field is allowed to be null.
  • Limits: the acceptable data range for the field.
  • Size: the upper limit data storage size for the field.
  • Default: the default value for the field.
  • Authority: the agency responsible for definition of the field.
  • Source: the most frequent source of data for this field.

Table Options:

  • type=MyISAM

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