Radiometric resolution relates to how much information is perceived by a satellite’s sensor. While the human eye detects color, Landsat sensors measure energy reflecting or emitted from the earth and relay that information as an image to users in varying degrees of greyscale. The higher the radiometric resolution, the more shades of grey the user sees.
Landsat data are characterized by digital numbers. A 4-bit image indicates there are 16 digital values available ranging from 0 to 15. A 16-bit resolution image indicates there are 65,536 potential digital numbers between 0 to 65,535 for that sensor to record information. Since Landsat imagery is acquired in greyscale, the minimum (lowest) value is represented as black, and the maximum (highest) value is represented as white. Comparing a 4-bit image to a 16-bit image shows notable differences within the greyscale.
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What are the band designations for the Landsat satellites?
The sensors aboard each of the Landsat satellites were designed to acquire data in different ranges of frequencies along the electromagnetic spectrum (View Bandpass Wavelengths for all Landsat Sensors). The Multispectral Scanner (MSS) carried on Landsat 1,2,3,4 and 5 collected data in four ranges (bands); the Thematic Mapper (TM) sensor on Landsat 4 and Landsat 5 included those found on earlier...
What are the best Landsat spectral bands for use in my research?
The Spectral Characteristics Viewer is an interactive tool that can be used to visualize how the bands, or channels, of different satellite sensors measure the intensity of the many wavelengths (colors) of light. This is also known as the relative spectral response (RSR). By overlaying the spectral curves from different features (spectra), one can determine which bands of the selected sensor will...
How do I search for and download Landsat data?
Landsat data products held in the USGS archives can be searched and downloaded at no charge from a variety of sources. Visit Landsat Data Access for information about how Landsat data products can be downloaded individually or in bulk. Landsat imagery not found in the USGS archive might have been collected by one of the USGS International Cooperator ground stations, each of which are the primary...
What Landsat data products are available?
There are several Landsat data products that are useful for science applications and land use/land change studies: Landsat Level-1 Science Products - Each Level-1 scene includes individual spectral band files, a metadata file, and additional ancillary files. These products cover worldwide scenes. U.S. Landsat Analysis Ready Data (ARD) - Uses Landsat Collections Level-1 data as input to provide...
What are the acquisition schedules for the Landsat satellites?
The Landsat 8 and Landsat 9 satellites orbit the Earth at an altitude of 705 kilometers (438 miles) in a 185-kilometer (115-mile) swath, moving from north to south over the sunlit side of the Earth in a sun synchronous orbit, following the Worldwide Reference System (WRS-2). Each satellite makes a complete orbit every 99 minutes, completes about 14 full orbits each day, and crosses every point on...
What sensors does the Landsat 9 satellite carry?
Landsat 9 carries the same instruments that are on the Landsat 8 satellite but with some improvements: Operational Land Imager (OLI) for reflective band data. Thermal Infrared Sensor (TIRS) for the thermal infrared bands. OLI has a slightly improved signal-to-noise ratio over Landsat 8's OLI. Landsat 9’s TIRS is a Class-B instrument with a five-year design life and a key improvement of stray light...
What are LandsatLook images?
LandsatLook images are full-resolution .jpeg files that were included as options when downloading Landsat Level-1 data from EarthExplorer or GloVis. Landsat Collection 2 LandsatLook images are now called "Full Resolution Browse images". Download them from EarthExplorer as individual files for each Landsat 1 through Landsat 9 Level-1 scene. These are useful for simple visual interpretation without...
How do I open Landsat satellite data files?
Many image processing programs (ERDAS IMAGINE®, PCI Geomatica®, ENVI®, IDRISI®, etc.)* can import a variety of image formats, including the GeoTIFF files of Landsat data. Free Multispec software that is included with the USGS lesson plan Tracking Change Over Time can be used for limited spectral analysis. To view Landsat scenes without using specialized software, download the LandsatLook images (...
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- FAQ
What are the band designations for the Landsat satellites?
The sensors aboard each of the Landsat satellites were designed to acquire data in different ranges of frequencies along the electromagnetic spectrum (View Bandpass Wavelengths for all Landsat Sensors). The Multispectral Scanner (MSS) carried on Landsat 1,2,3,4 and 5 collected data in four ranges (bands); the Thematic Mapper (TM) sensor on Landsat 4 and Landsat 5 included those found on earlier...
What are the best Landsat spectral bands for use in my research?
The Spectral Characteristics Viewer is an interactive tool that can be used to visualize how the bands, or channels, of different satellite sensors measure the intensity of the many wavelengths (colors) of light. This is also known as the relative spectral response (RSR). By overlaying the spectral curves from different features (spectra), one can determine which bands of the selected sensor will...
How do I search for and download Landsat data?
Landsat data products held in the USGS archives can be searched and downloaded at no charge from a variety of sources. Visit Landsat Data Access for information about how Landsat data products can be downloaded individually or in bulk. Landsat imagery not found in the USGS archive might have been collected by one of the USGS International Cooperator ground stations, each of which are the primary...
What Landsat data products are available?
There are several Landsat data products that are useful for science applications and land use/land change studies: Landsat Level-1 Science Products - Each Level-1 scene includes individual spectral band files, a metadata file, and additional ancillary files. These products cover worldwide scenes. U.S. Landsat Analysis Ready Data (ARD) - Uses Landsat Collections Level-1 data as input to provide...
What are the acquisition schedules for the Landsat satellites?
The Landsat 8 and Landsat 9 satellites orbit the Earth at an altitude of 705 kilometers (438 miles) in a 185-kilometer (115-mile) swath, moving from north to south over the sunlit side of the Earth in a sun synchronous orbit, following the Worldwide Reference System (WRS-2). Each satellite makes a complete orbit every 99 minutes, completes about 14 full orbits each day, and crosses every point on...
What sensors does the Landsat 9 satellite carry?
Landsat 9 carries the same instruments that are on the Landsat 8 satellite but with some improvements: Operational Land Imager (OLI) for reflective band data. Thermal Infrared Sensor (TIRS) for the thermal infrared bands. OLI has a slightly improved signal-to-noise ratio over Landsat 8's OLI. Landsat 9’s TIRS is a Class-B instrument with a five-year design life and a key improvement of stray light...
What are LandsatLook images?
LandsatLook images are full-resolution .jpeg files that were included as options when downloading Landsat Level-1 data from EarthExplorer or GloVis. Landsat Collection 2 LandsatLook images are now called "Full Resolution Browse images". Download them from EarthExplorer as individual files for each Landsat 1 through Landsat 9 Level-1 scene. These are useful for simple visual interpretation without...
How do I open Landsat satellite data files?
Many image processing programs (ERDAS IMAGINE®, PCI Geomatica®, ENVI®, IDRISI®, etc.)* can import a variety of image formats, including the GeoTIFF files of Landsat data. Free Multispec software that is included with the USGS lesson plan Tracking Change Over Time can be used for limited spectral analysis. To view Landsat scenes without using specialized software, download the LandsatLook images (...
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