L'indice de neige à différence normalisée (NDSI) permet d'identifier la neige en fonction de sa réflectance, qui est généralement plus élevée dans la partie visible du spectre que dans l'infrarouge moyen. Le NDSI est calculé à l'aide des bandes verte et infrarouge moyen, et sa plage de valeurs va de -1,0 à 1,0. Pour en savoir plus, consultez Riggs et al. (1994). Ce produit est généré à partir des composites de réflectance de surface MODIS/006/MOD09GA.
Bracelets
Bandes de fréquences
Nom
Taille des pixels
Description
NDSI
463,313 mètres
Indice de neige à différence normalisée
Conditions d'utilisation
Conditions d'utilisation
Les données et produits MODIS acquis via le LP DAAC ne sont soumis à aucune restriction concernant leur utilisation, leur vente ou leur redistribution ultérieures.
L'indice de neige à différence normalisée (NDSI) permet d'identifier la neige en fonction de sa réflectance, qui est généralement plus élevée dans la partie visible du spectre que dans l'infrarouge moyen. Le NDSI est calculé à l'aide des bandes verte et infrarouge moyen, et sa plage de valeurs est comprise entre -1,0 et 1,0. Voir Riggs et al. (1994) pour …
[null,null,[],[[["\u003cp\u003eThe MODIS/MOD09GA_006_NDSI dataset provides daily, global Normalized Difference Snow Index (NDSI) values derived from MODIS Terra surface reflectance composites.\u003c/p\u003e\n"],["\u003cp\u003eNDSI, ranging from -1.0 to 1.0, helps identify snow cover based on its higher reflectance in the visible spectrum compared to the mid-infrared.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset is freely available for use, sale, and redistribution through the Google Earth Engine platform.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset covers the period from February 24, 2000, to February 17, 2023, and is provided by Google.\u003c/p\u003e\n"]]],[],null,["# MODIS Terra Daily NDSI\n\nDataset Availability\n: 2000-02-24T00:00:00Z--2023-02-17T00:00:00Z\n\nDataset Provider\n:\n\n\n [Google](https://earthengine.google.com/)\n\nCadence\n: 1 Day\n\nTags\n:\n daily \n global \n mod09ga \n modis \n ndsi \n surface-reflectance \n terra \n usgs \nvegetation-indices \n\n#### Description\n\nThe Normalized Difference Snow Index is used to\nidentify snow, based on its characteristically higher reflectance in\nthe visible portion of the spectrum compared to the mid-IR. NDSI is\ncomputed using the Green and Mid-IR bands, and has a range of -1.0 to\n1.0. See\n[Riggs et al. (1994)](https://doi.org/10.1109/IGARSS.1994.399618)\nfor details. This product is generated from the MODIS/006/MOD09GA surface reflectance composites.\n\n### Bands\n\n**Bands**\n\n| Name | Pixel Size | Description |\n|--------|----------------|----------------------------------|\n| `NDSI` | 463.313 meters | Normalized Difference Snow Index |\n\n### Terms of Use\n\n**Terms of Use**\n\nMODIS data and products acquired through the LP DAAC have no restrictions on subsequent use, sale, or redistribution.\n\n### Explore with Earth Engine\n\n| **Important:** Earth Engine is a platform for petabyte-scale scientific analysis and visualization of geospatial datasets, both for public benefit and for business and government users. Earth Engine is free to use for research, education, and nonprofit use. To get started, please [register for Earth Engine access.](https://console.cloud.google.com/earth-engine)\n\n### Code Editor (JavaScript)\n\n```javascript\nvar dataset = ee.ImageCollection('MODIS/MOD09GA_006_NDSI')\n .filter(ee.Filter.date('2018-04-01', '2018-06-01'));\nvar colorized = dataset.select('NDSI');\nvar colorizedVis = {\n palette: ['000088', '0000ff', '8888ff', 'ffffff'],\n};\nMap.setCenter(-7.03125, 31.0529339857, 2);\nMap.addLayer(colorized, colorizedVis, 'Colorized');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/MODIS/MODIS_MOD09GA_006_NDSI) \n[MODIS Terra Daily NDSI](/earth-engine/datasets/catalog/MODIS_MOD09GA_006_NDSI) \nThe Normalized Difference Snow Index is used to identify snow, based on its characteristically higher reflectance in the visible portion of the spectrum compared to the mid-IR. NDSI is computed using the Green and Mid-IR bands, and has a range of -1.0 to 1.0. See Riggs et al. (1994) for ... \nMODIS/MOD09GA_006_NDSI, daily,global,modis,ndsi,surface-reflectance,terra,usgs,vegetation-indices \n2000-02-24T00:00:00Z/2023-02-17T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://earthengine.google.com/)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/MODIS_MOD09GA_006_NDSI)"]]
