These Landsat 7 composites are made from Level L1T orthorectified scenes, using the
computed top-of-atmosphere (TOA) reflectance. See Chander et al.
(2009)
for details on the TOA computation.
As of May 1, 2017, the USGS is no longer producing Pre-Collection Landsat, and therefore this collection is complete. Please switch to a Collection 1-based dataset. See this documentation page for more information.
The Normalized Difference Water Index (NDWI) is sensitive
to changes in liquid water content of vegetation canopies. It is
derived from the Near-IR band and a second IR band, ≈1.24μm when
available and the nearest available IR band otherwise. It ranges in
value from -1.0 to 1.0. See
Gao (1996)
for details.
These composites are created from
all the scenes in
each annual period beginning from the first day of the year and
continuing to the last day of the year. All the images from each year
are included in the composite, with the most recent pixel as the composite value.
Bands
Bands
Name
Pixel Size
Description
NDWI
30 meters
Normalized Difference Water Index
Terms of Use
Terms of Use
Landsat datasets are federally created data
and therefore reside in the public domain and may be used, transferred, or reproduced without copyright restriction.
Acknowledgement or credit of the USGS as data source should be provided
by including a line of text citation such as the example shown below.
(Product, Image, Photograph, or Dataset Name) courtesy of
the U.S. Geological Survey
Example: Landsat-7 image courtesy of the U.S. Geological Survey
These Landsat 7 composites are made from Level L1T orthorectified scenes, using the computed top-of-atmosphere (TOA) reflectance. See Chander et al. (2009) for details on the TOA computation. As of May 1, 2017, the USGS is no longer producing Pre-Collection Landsat, and therefore this collection is complete. Please switch to …
[[["Easy to understand","easyToUnderstand","thumb-up"],["Solved my problem","solvedMyProblem","thumb-up"],["Other","otherUp","thumb-up"]],[["Missing the information I need","missingTheInformationINeed","thumb-down"],["Too complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],[],[[["This Landsat 7 annual composite dataset, including Normalized Difference Water Index (NDWI), is deprecated and has been replaced by a newer version."],["The dataset covers the period from 1999 to 2017 and is based on Level L1T orthorectified scenes with top-of-atmosphere (TOA) reflectance."],["NDWI, sensitive to changes in liquid water content of vegetation canopies, is derived from the Near-IR band and a second IR band."],["Users are recommended to switch to the Collection 1-based dataset, LANDSAT/LE07/C01/T1_ANNUAL_NDWI, for continued Landsat analysis."],["Landsat datasets are public domain and can be used freely with proper USGS acknowledgement."]]],["This dataset provides Landsat 7 annual composites from 1999 to 2017, calculated using top-of-atmosphere reflectance from Level L1T orthorectified scenes. The composites include the Normalized Difference Water Index (NDWI), derived from near-infrared bands and reflecting liquid water content. Data is from USGS and is now deprecated, replaced by LANDSAT/LE07/C01/T1_ANNUAL_NDWI. The dataset is composed of all images within each year, with the most recent pixel as the value, and is in the public domain.\n"]]
