Using Landsat Data

Landsat image data processing takes 1 to 5 days. Once a request is submitted and the data is processed, an email notification containing the direct download URL is sent.After Landsat scenes are processed, they are also made available for immediate...
Scene acquisition times for Landsat images are listed in the online metadata files, which can be accessed by searching the particular scene on EarthExplorer or GloVis. Scenes processed after February 9, 2009 also include the acquisition times in the .mtl...
The percentage of cloud cover is calculated when raw mission data from Landsat Thematic Mapper (TM) and Enhanced Thematic Mapper Plus (ETM+) are processed to Level-0R during ingest into the archive using the Automatic Cloud Cover Assessment (ACCA)...
A few common anomalies occasionally seen in Landsat data include dropped scan lines, Memory Effect, and detector failure.   A more complete list and details on anomalies discovered and investigated can be found on the Landsat Anomalies Web page.
This is a common question considered by all users of remotely sensed data. The level of detail (spatial resolution) is often the most interesting aspect of viewing a satellite image, but less appreciated is how changes in irradiative energy reflected by...
EarthExplorer and Glovis   allow searching and downloading of the Landsat dataset collections held in the USGS EROS archives.Scenes already processed can be downloaded immediately; requests for processing can be submitted for scenes not downloadable from...
Nighttime (ascending) Landsat scenes can only be searched and downloaded or requested for processing through EarthExplorer.To search for nighttime scenes, you need to know either the daytime (descending) path/row, or the coordinates of your area of...
The USGS File List Ordering page allows you to enter lists of Landsat and other images (up to 100 individual files) and see which scenes can be downloaded immediately, which scenes need to be processed, and the scenes that are not available.The USGS File...
Yes, the Landsat 7 Science Data User's Handbook is a living document prepared by the Landsat Project Science Office at NASA's Goddard Space Flight Center in Greenbelt, Maryland. Its purpose is to provide a basic understanding of the joint NASA/USGS...
SLC-off Gap Mask FilesBand-specific gap mask files are included with every Scan Line Corrector (SLC)-off standard Landsat 7 data product. These ancillary data files allow users to identify the location of all pixels affected by the original data gaps in...