Radiometric Calibration Options for ACRES Landsat 7 ETM+ products

There are two options for radiometric calibration that are now available to customers ordering Landsat 7 ETM+ products:

• National Aeronautics and Space Administration (NASA)
• Canadian Centre for Remote Sensing (CCRS)

The NASA and CCRS relative calibration methods differ in the technique used for de-striping the image.

The NASA method averages the brightness values for all detectors in the multi-spectral bands and also matches the scene statistics in the forward and reverse scans. This method reduces banding artefacts in the image, especially over the areas with low brightness values.

The CCRS method uses a reference detector for each band to match the brightness values of the other detectors in conjunction with scene statistics in the multi-spectral bands. In this method, de-striping corrections are calculated and applied independently to forward and reverse scans.