: These .txt files are used by GIS software (like ENVI or ERDAS IMAGINE) to correctly "place" the imagery on a global grid.
: These files are officially generated and distributed by the U.S. Geological Survey (USGS) through platforms like EarthExplorer. Download 07NDASAT txt
: Ensure the filename matches the specific scene ID of the Landsat imagery you are processing. : These
: Files from official sources like the USGS are highly reliable and essential for accurate radiometric calibration of satellite imagery. : Ensure the filename matches the specific scene
This file is part of the legacy infrastructure for Earth observation data. While modern Landsat data is primarily distributed in GeoTIFF or Cloud Optimized GeoTIFF (COG) formats, "07NDASAT.txt" (or similar NDF-formatted files) was standard for earlier processing systems like NLAPS.
: If your software supports it, consider downloading the newer MTL.txt (Metadata) files provided with GeoTIFF products, as these have replaced the older NDF formats in most modern workflows. Landsat 7 | U.S. Geological Survey - USGS.gov