AI-generated Key Takeaways
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The dataset provides annual Landsat Collection 2 Tier 1 Level 2 composites with Normalized Difference Water Index (NDWI) data.
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NDWI values, ranging from -1.0 to 1.0, indicate changes in liquid water content of vegetation canopies.
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The composites are created annually using all scenes from the year, prioritizing the most recent pixel.
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Dataset coverage spans from 1984 to 2024, with specific exclusions for Landsat 7 and 8 due to orbital drift and pointing issues, respectively.
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Landsat datasets are in the public domain and can be freely used with proper USGS acknowledgement.
- Dataset Availability
- 1984-01-01T00:00:00Z–2025-01-01T00:00:00Z
- Dataset Provider
- USGS
- Cadence
- 1 Year
- Tags
Description
These Landsat Collection 2 Tier 1 Level 2 composites are made from Tier 1 Level 2 orthorectified scenes.
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.
Notes:
Only daytime images with WRS_ROW < 122 are included.
For Landsat 7 , images after 2017-01-01 are excluded due to orbital drift.
For Landsat 8, images before 2013-05-01 are excluded due to pointing issues.
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.
Explore with Earth Engine
Code Editor (JavaScript)
var dataset = ee.ImageCollection('LANDSAT/COMPOSITES/C02/T1_L2_ANNUAL_NDWI') .filterDate('2017-01-01', '2017-12-31'); var colorized = dataset.select('NDWI'); var colorizedVis = { min: 0.0, max: 1.0, palette: ['0000ff', '00ffff', 'ffff00', 'ff0000', 'ffffff'], }; Map.setCenter(6.746, 46.529, 6); Map.addLayer(colorized, colorizedVis, 'Colorized');