These Landsat 7 Collection 1 Tier 1 composites are made from Tier 1 orthorectified scenes, using the
computed top-of-atmosphere (TOA) reflectance.
See Chander et al. (2009)
for details on the TOA computation.
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
8-day period beginning from the first day of the year and continuing
to the 360th day of the year. The last composite of the year,
beginning on day 361, will overlap the first composite of the
following year by 3 days. All the images from each 8-day period 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 Collection 1 Tier 1 composites are made from Tier 1 orthorectified scenes, using the computed top-of-atmosphere (TOA) reflectance. See Chander et al. (2009) for details on the TOA computation. The Normalized Difference Water Index (NDWI) is sensitive to changes in liquid water content of vegetation canopies. It …
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],[],[[["\u003cp\u003eThis Landsat 7 Collection 1 Tier 1 8-Day NDWI Composite dataset has been superseded by a newer version, LANDSAT/COMPOSITES/C02/T1_L2_8DAY_NDWI.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset provides 8-day composites of the Normalized Difference Water Index (NDWI) derived from Landsat 7 imagery.\u003c/p\u003e\n"],["\u003cp\u003eNDWI values, ranging from -1.0 to 1.0, indicate changes in liquid water content within vegetation canopies.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset covers the period from 1999-01-01 to 2021-12-27 and is freely available for research, education, and nonprofit use.\u003c/p\u003e\n"],["\u003cp\u003eUsers should acknowledge the USGS as the data source when utilizing this dataset.\u003c/p\u003e\n"]]],[],null,[]]
