These Landsat 4 TM 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 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 4 TM 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 …
[[["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complicated / too many steps","tooComplicatedTooManySteps","thumb-down"],["Out of date","outOfDate","thumb-down"],["Samples / code issue","samplesCodeIssue","thumb-down"],["Other","otherDown","thumb-down"]],[],[[["This Landsat 4 TM 32-Day NDWI Composite dataset is deprecated and has been replaced by a newer version (LANDSAT/LT04/C01/T1_32DAY_NDWI)."],["The dataset covers the period from August 13, 1982, to November 17, 1993, and is based on Landsat 4 TM Level L1T orthorectified scenes."],["It features a Normalized Difference Water Index (NDWI) band with a 30-meter resolution, useful for monitoring changes in liquid water content of vegetation."],["This dataset is provided by the USGS and is in the public domain, but users are encouraged to acknowledge the USGS as the data source."],["The USGS no longer produces Pre-Collection Landsat data, making this collection complete; users are advised to switch to Collection 1-based datasets for ongoing analysis."]]],["This dataset, LANDSAT/LT4_L1T_32DAY_NDWI, contains Landsat 4 TM composites from 1982 to 1993, derived from orthorectified scenes and top-of-atmosphere reflectance. It is deprecated and superseded by a newer dataset. The data, from the USGS, is presented as 32-day composites using the Normalized Difference Water Index (NDWI), which is useful for observing vegetation liquid water content. This collection is complete, as the USGS stopped producing pre-collection Landsat.\n"]]
