AI-generated Key Takeaways
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This Landsat 7 annual composite dataset, including Normalized Difference Water Index (NDWI), is deprecated and has been replaced by a newer version.
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The dataset covers the period from 1999 to 2017 and is based on Level L1T orthorectified scenes with top-of-atmosphere (TOA) reflectance.
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NDWI, sensitive to changes in liquid water content of vegetation canopies, is derived from the Near-IR band and a second IR band.
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Users are recommended to switch to the Collection 1-based dataset, LANDSAT/LE07/C01/T1_ANNUAL_NDWI, for continued Landsat analysis.
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Landsat datasets are public domain and can be used freely with proper USGS acknowledgement.
- Dataset Availability
- 1999-01-01T00:00:00Z–2017-01-01T00:00:00Z
- Dataset Provider
- USGS
- Tags
Description
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
See the USGS Visual Identity System Guidance for further details on proper citation and acknowledgement of USGS products.