Jan. 13, 2026, 1:33 p.m.

Project: MISR

The MISR instrument aboard NASA’s Terra satellite has maintained excellent absolute and camera-to-camera radiometric calibration over more than a quarter century by employing routine bi-monthly onboard calibration procedures. Absolute radiances over uniform bright scenes are required to deviate by less than ±3% from the calibration established at the beginning of the mission. A new MISR calibration analysis indicates that this requirement has been achieved in all channels throughout the mission except for recent calibration of the red (672 nm) band in the nadir camera. Since October 2022, the average radiances in this channel have been underestimated by about 3−4 % as a result of the drift in Terra’s equator-crossing time. A set of corrections has been developed. This notice will be updated when these corrections are implemented in MISR operational processing.

January 8, 2026: Update to the MISR radiometric calibration notice. A new set of calibration coefficients has been implemented in MISR operational processing. The new calibration incorporates several radiometric corrections that considerably improve radiometric accuracy of all MISR channels. The change was implemented on December 9, 2025, starting with MISR orbit 138200. Data for the entire mission is currently being reprocessed to incorporate additional calibration updates and is available to the public in the latest release of the MISR L1B2 product.

Information about these products and details about product quality are available on the MISR project page

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Related URLS: https://asdc.larc.nasa.gov/project/MISR