Landsat Missions

Thematic Mapper No-Payload Correction Data Radiometric Calibration

In normal Landsat data processing, blackbody and shutter temperatures are extracted from the Payload Correction Data (PCD) and used to estimate per-scan gains and biases necessary for the radiometric calibration of the instrument's thermal band data.

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In case of TM no-PCD data, where the blackbody and shutter temperatures are not available, the temperature information is obtained from lifetime Look-Up-Tables (LUTs) of blackbody and shutter temperatures generated using a database of trended temperatures stored during radiometric processing of all TM scenes with valid PCD information. Note: There is no difference in the radiometric processing of the TM reflective bands (bands 1-5 and 7), when comparing standard TM data and no-PCD.

Radiometric comparison of the standard TM PCD-based scenes and the LUT-based no-PCD scenes reveals the difference in radiance is 1) scene dependent, and 2) generally within a small percentage.

Below, a comparison of an area within WRS-2 path 38 row 38 from January 1985 to December 1998 shows that the difference in radiance is within 3 percent, except for a few scenes acquired within few days of outgassing events where the difference is as high as 28 percent.  For PCD-based TM data, the average difference is .11 percent.

Landsat TM “no-Payload Correction" Data Comparison (Path 38, Row 38)

This graphic shows the difference in top of atmosphere (TOA) radiance over an area within path 38, row 38 between standard Landsat TM Payload Correction-based data and Look-up Table (LUT)-based no-Payload Correction Data (PCD). Vertical lines correspond to outgassing dates.