new Long Term Archive
Browse image for an AVHRR composite for
September 17-30, 2013
Derived NDVI band for September 17-30, 2013
Normalized Difference Vegetation Index (NDVI) Composites are produced from multiple Advanced Very High Resolution Radiometer (AVHRR) daily observations that have been composited together to create a nearly cloud-free image showing maximum greenness. An NDVI ratio is produced from bands one and two of the AVHRR composite to produce a derived NDVI band composite.
The following NDVI products are available:
Conterminous U.S. and Alaska Weekly and biweekly NDVI composites date from January 1989 to present. U.S. composites are cast to the Lambert Azimuthal Equal-Area projection. Alaska composites are cast to the Albers Equal-Area Conic projection. The data will include a composite for each of the acquired AVHRR bands, as well as a derived NDVI band. The files are available in binary (8-bit) format.
Global 10-day composites consist of 10-day composited AVHRR data and a derived NDVI band for limited dates between April 1992 and May 1996. The data is cast to the Interrupted Goode's Homolosine projection. Subsampled resolution and geographic subsets are also available.
Raw (Level 1b) data consists of a single scene that was collected by a single AVHRR satellite on a specific date and time. The approximate scene size is 2400 x 6400 kilometers (1491 x 4000 miles). Public distribution is via the NOAA Satellite Active Archive.
For information on how to cite USGS data plus guidance on usage restrictions,
please see our Data Citations and Use page at https://lta.cr.usgs.gov/citation.
Any use of trade, firm, or product names is for descriptive purposes only and
does not imply endorsement by the U.S. Government.
Long Term Archive User Services
U.S. Geological Survey (USGS)
Earth Resources Observation and Science (EROS) Center
47914 252nd Street
Sioux Falls, SD 57198-0001
Phone Number: 605-594-6151
Toll Free: 800-252-4547
Business Hours: Monday thru Friday, 8:00 a.m. to 4:00 p.m., Central Time