AI-generated Key Takeaways
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The MODIS/MOD09GA_006_NDWI dataset provides daily, global Normalized Difference Water Index (NDWI) values derived from MODIS Terra surface reflectance.
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NDWI, ranging from -1.0 to 1.0, is an indicator of liquid water content in vegetation canopies, calculated using Near-IR and a second IR band (≈1.24μm or nearest available).
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This dataset is freely available for use, sale, and redistribution through the Google Earth Engine platform.
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The data is provided by Google and covers the period from February 24, 2000 to February 17, 2023.
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Users can access and analyze this dataset using the Earth Engine Code Editor for research, education, and non-profit purposes.
- Dataset Availability
- 2000-02-24T00:00:00Z–2023-02-17T00:00:00Z
- Dataset Provider
- Cadence
- 1 Day
- Tags
Description
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. This product is generated from the MODIS/006/MOD09GA surface reflectance composites.
Bands
Bands
| Name | Pixel Size | Description |
|---|---|---|
NDWI |
463.313 meters | Normalized Difference Water Index |
Terms of Use
Terms of Use
MODIS data and products acquired through the LP DAAC have no restrictions on subsequent use, sale, or redistribution.
Explore with Earth Engine
Code Editor (JavaScript)
var dataset = ee.ImageCollection('MODIS/MOD09GA_006_NDWI') .filter(ee.Filter.date('2018-04-01', '2018-06-01')); var colorized = dataset.select('NDWI'); var colorizedVis = { min: 0.0, max: 1.0, palette: ['0000ff', '00ffff', 'ffff00', 'ff0000', 'ffffff'], }; Map.setCenter(-7.03125, 31.0529339857, 2); Map.addLayer(colorized, colorizedVis, 'Colorized');