description Landsat 8 Overview
Landsat 8 is an active Earth observation satellite operated by NASA and the USGS. This mission continues a decades-long program providing consistent imagery of our planet. The satellite utilizes Operational Land Imager (OLI) and Thermal Infrared Sensor (TIRS) instruments to measure land surface temperature and reflectances, crucial for monitoring changes in vegetation, water resources, and urban areas. It’s utilized by scientists, researchers, and government agencies needing long-term data for environmental studies, disaster response, and resource management.
help Landsat 8 FAQ
What is the difference between Landsat 8's OLI and TIRS instruments?
The Operational Land Imager records visible, near-infrared, and shortwave-infrared information about Earth's surface. The Thermal Infrared Sensor measures emitted heat, which supports work such as estimating land-surface temperature.
How often does Landsat 8 photograph the same location?
Landsat 8 follows a 16-day repeat cycle on its own. Landsat 9 flies in an offset orbit, so the two satellites together can provide an observation opportunity roughly every eight days.
What resolution do Landsat 8 images have?
Most OLI multispectral bands have a spatial resolution of 30 meters, while the panchromatic band provides 15-meter detail. The satellite images a swath about 185 kilometers wide.
Can anyone download Landsat 8 data?
Yes, USGS distributes Landsat imagery without charging users for each scene. Landsat 8 launched on February 11, 2013, and its archive is available through USGS Earth-observation data services.
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