AI-generated Key Takeaways
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This dataset provides 32-day composites of Landsat Collection 2 Tier 1 Level 2 data, spanning from 1984-01-01T00:00:00Z to 2025-02-02T00:00:00Z, sourced from Google Earth Engine.
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The primary focus of the dataset is the Normalized Difference Water Index (NDWI), calculated using near-infrared bands to measure liquid water content in vegetation canopies, with values ranging from -1.0 to 1.0.
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Composites are created from all scenes within each 32-day period, with the most recent pixel value represented, and only daytime images with WRS_ROW < 122 are included in the data.
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The Landsat data is in the public domain, allowing for unrestricted use and reproduction, however, proper credit to the U.S. Geological Survey (USGS) as the data source is required.
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The dataset is accessible through Google Earth Engine for research, education, and nonprofit use, along with a code snippet provided for direct implementation and is available for use on the platform.
- Dataset Availability
- 1984-01-01T00:00:00Z–2025-09-14T00:00:00Z
- Dataset Provider
- Cadence
- 32 Days
- 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 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.
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_32DAY_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');