Recognizing the need, the USGS has begun production of higher-level (more highly processed) Landsat data products to help advance land surface change studies. One such product is Landsat surface reflectance data.
Surface reflectance data products approximate what a sensor held just above the Earth’s surface would measure, if conditions were ideal without any intervening artifacts (interference or changing conditions) that may come from the Earth’s atmosphere, different levels of illumination, and the changing geometry of the view by the sensor from hundreds of miles above the Earth. The precise removal of atmospheric artifacts increases the consistency and comparability between images of the Earth’s surface taken at different times of the year and different times of the day.
Surface reflectance and other high level data products can be requested through the USGS Earth Resources Observation and Science (EROS) Center by accessing the EROS Science Processing Architecture (ESPA) interface. Surface reflectance data are also available using the USGS EarthExplorer; select “Landsat CDR” under the tab for datasets.
More information on Landsat surface reflectance data is available at the USGS Landsat website and in an updated USGS Fact Sheet.
The Pale Blue Dot Visualization Challenge—aimed at making Earth observation data accessible to everyone—has officially kicked off.