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 32-day period beginning from the first day of the year and
continuing to the 352nd day of the year. The last composite of the
year, beginning on day 353, will overlap the first composite of the
following year by 20 days. All the images from each 32-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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],[],[[["This Landsat 7 dataset provides 32-day composites of the Normalized Difference Water Index (NDWI) from 1999 to 2021."],["The dataset is considered deprecated and has been replaced by a newer version: LANDSAT/COMPOSITES/C02/T1_L2_32DAY_NDWI."],["NDWI values range from -1.0 to 1.0 and reflect changes in liquid water content of vegetation canopies."],["Images are composites of all scenes within a 32-day period, prioritizing the most recent pixel."],["Landsat data is public domain, but users should acknowledge the USGS as the data source."]]],["This Landsat 7 dataset, available from 1999 to 2021, provides 32-day composites of the Normalized Difference Water Index (NDWI) derived from Tier 1 orthorectified scenes. Composites are created from all scenes within each 32-day period, with the most recent pixel used. The NDWI, ranging from -1.0 to 1.0, indicates liquid water content in vegetation. It has a pixel size of 30 meters. This dataset has been superseded by LANDSAT/COMPOSITES/C02/T1_L2_32DAY_NDWI.\n"]]
