Landsat 8 - 1 of 5
Landsat 8 FAQs - 5 Found
Landsat 8 carries two push-broom instruments: the Operational Land Imager (OLI), and the Thermal Infrared Sensor (TIRS) “Push-broom” refers to the one-way motion of the sensor, as opposed to a back-and-forth motion.
The spectral bands of the OLI sensor are similar to Landsat 7’s ETM+ sensor but include two new spectral bands: a deep blue visible channel (band 1) specifically designed for water resources and coastal zone investigation, and a new infrared channel (band 9) for the detection of cirrus clouds. A new Quality Assurance band is also included with each data product. This provides information on the presence of features such as clouds, water, and snow.
The TIRS instrument collects two spectral bands for the wavelength covered by a single band on the previous TM and ETM+ sensors.
Bandpass wavelengths for Landsat 8 OLI and TIRS sensor, compared to Landsat 7 ETM+ sensor
The data quality (signal to noise ratio) and radiometric quantization (12-bits) of the OLI and TIRS is higher than previous Landsat instruments (8-bit for TM and ETM+), providing significant improvement in the ability to detect changes on the Earth’s surface.
At least 400 scenes are collected daily, and placed into the USGS archive to become available for download within 12 hours after acquisition.