Mars Image Explorer|

Apparent Brightness Record - The ABR is derived from band 3 of a VIS-RDR QUBE (or first available band of the highest calibration product available). See sdpsis.pdf for a summary of the image processing. This file is a PDS IMAGE object with an attached PDS label.

List of the band numbers corresponding to each band in the image

• IR images have 1-10 bands available
• VIS images have 1-5 bands available

Band numbers correspond to each layer contained in an image; up to 10 bands available in an IR image, and up to 5 bands available in a VIS image. The band number is equivalent to the instrument band number listed in Table 1, Section 2.2 of the THEMIS sdpsis.pdf.

Brightness Temperature Record - The BTR is derived from band 9 of a IR-RDR QUBE (or first available band of the highest calibration product available). See sdpsis.pdf for a summary of the image processing. This file is a PDS IMAGE object with an attached PDS label.

Flag indcates potential problems may have been encountered during the IR calibration routine; the user is advised to review the quality of the calibration. The flag is triggered by image saturation or undersaturation, length of time between the image and the shutter image, noise evaluation of the shutter image, and yaw angle of ODY spacecraft.

Decorrelation Stretch Image - These four panel images include three DCS images and a surface temperature image. The DCS images are generated by stretching correlated radiances of the following band combinations: band 8, 7, 5 (left DCS panel); bands 9, 6, 4 (middle DCS panel); and bands 6, 4, 2 (right DCS panel). See THEMIS geometry.pdf for more information.

Description of the image given by the mission planner. When selecting by description, all text entered into the field will be directly compared with available descriptions.

The length of time (in seconds) requried to collect all frames of all bands in the downlinked image; typical values range from 0.5 to 450.

Average derived dust opacity (9µm) for a warm, daytime IR image; typical values range from 0.05 to 0.25.

Experiment Data Record - This file contains the raw THEMIS science data at the full resolution returned from the spacecraft, time ordered, with duplicates and transmission errors removed. This file is a PDS SPECTRAL_QUBE object with an attached PDS label. See THEMIS sdpsis.pdf for more information.

Measured from the center of the image, this is the angle between THEMIS and a "normal" drawn perpendicular to the planet's surface. In most cases, THEMIS is looking "straight down", thus, the emission angle is close to 0°.

Generates a false color image from three bands of a multi-band VIS image. By default, bands 3,2,1 are represented in red, green, and blue; however, any three band combination can be generated by editing the "band=321" phrase in the url.

Geometrically Registered Record - This file contains the geometric projection of the RDR standard data product; the data is stored as a multispectral ISIS CUBE file and associated with a PDS-style, detached label. Note that additional manipulation of the source data may invalidate the calibrated radiance values. See THEMIS geometry.pdf for more information.

Description of the geometry kernels used by the ISIS software when generating geometric information for this image. Valid values: "Not available", "Predicted", "Reconstructed", "Nadir Pointing Assumed".

A unique identifier for each image commanded; follows the pattern Xoooooiii, where

• X is the image type (I, R, S, or V - case sensitive)
• ooooo is the zero padded, 5 digit orbit number
• iii is the zero padded, 3 digit image number

Examples: I00816001 or V00816002

Subjective assessment of image quality ranging from unusable to good; assesment includes consideration of exposure, missing lines, instrument noise, and atmospheric features.

The size in pixels of the image qube along each axis (sample, line, band).

Derived for the center of the image, this is the angle between the Sun and a "normal" drawn perpendicular 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.

• "DAY" images have an incidence angle of 0-90 degrees
• "NIGHT" images have an incidence angle of 90-180 degrees

Commonly abbreviated as "Solar Incidence Angle" or "Solar Angle".

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.

For more information on how latitude is used to select images, see this FAQ

The vertical size of a pixel at the center of the image as projected onto the surface of the target; units are given with the value.