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Landsat 7, launched on April 15th 1999 with Advanced Enhanced Thematic Mapper Plus (ETM+) sensor. Unfortunately on May 31st 2003 the SLC (Scan line corrector) in the ETM+ instrument failed which leads to the stripping or missing of scan line in the satellite image. The ETM+ has continued to acquire data with the SLC powered off, leading to images that are missing approximately 22 percent of the normal scene area. Various techniques are available for the SLC correction. Most of the remote sensing software package includes a separate module for it. On this tutorial we are using Erdas software, which isn't an open source, commercial. Even though Landsat 8 is launched recently which is SLC error free, still Landsat 7 image is important for remote sensing analysis.
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