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On May 31, 2003, the scan-line corrector (SLC) for the ETM+ sensor aboard the Landsat 7 satellite failed permanently. Normally, the SLC compensates for the satellite's forward motion. Without an operating SLC, images have wedge-shaped gaps that range in width from a single pixel near the nadir point to about 12 pixels near the scene's edges.
Because of the SLC anomaly, approximately 22% of the pixels in these images are unscanned. The result of the SLC failure (known as the SLC-off problem) makes it difficult to use the Landsat 7 ETM+ data. To solve the SLC-off issue and enable continuous use of ETM+, we must find a suitable method for estimating the values at un-scanned pixels.
This video shows how to destripe Landsat ETM+ image using QGIS.