此数据集包含网格化日归一化差值植被指数 (NDVI)，该指数源自 NOAA 可见红外成像辐射计套件 (VIIRS) 地表反射率的气候数据记录 (CDR)。数据记录涵盖了 2014 年至今，使用的是 NOAA 极地轨道卫星的数据。这些数据投影到 0.05 度 x 0.05 度的全球网格上。此数据集是由 NASA Goddard Space Flight Center (GSFC) 和 University of Maryland (UMD) 制作的陆地表面 CDR 产品之一。
[null,null,[],[[["\u003cp\u003eThis dataset provides daily gridded Normalized Difference Vegetation Index (NDVI) data derived from the NOAA Climate Data Record (CDR) of Visible Infrared Imaging Radiometer Suite (VIIRS) Surface Reflectance.\u003c/p\u003e\n"],["\u003cp\u003eThe data, sourced from NOAA polar-orbiting satellites, spans from January 1, 2014, to January 31, 2025, and is projected on a 0.05-degree global grid.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset includes bands for NDVI, time of day, and quality control, with a pixel size of 5566 meters.\u003c/p\u003e\n"],["\u003cp\u003eKnown issues include inaccuracies in the TIMEOFDAY variable and minor errors in latitude and longitude values related to the grid cell centers.\u003c/p\u003e\n"],["\u003cp\u003eThe data is nonproprietary and publicly accessible, with the primary sensor used being VIIRS since 2014, as outlined by the NOAA CDR Program.\u003c/p\u003e\n"]]],[],null,["Dataset Availability\n: 2014-01-01T00:00:00Z--2025-08-22T00:00:00Z\n\nDataset Provider\n:\n\n\n [NOAA](https://www.ncei.noaa.gov/products/climate-data-records/normalized-difference-vegetation-index)\n\nCadence\n: 1 Day\n\nTags\n:\n[cdr](/earth-engine/datasets/tags/cdr) [daily](/earth-engine/datasets/tags/daily) [land](/earth-engine/datasets/tags/land) [ndvi](/earth-engine/datasets/tags/ndvi) [noaa](/earth-engine/datasets/tags/noaa) [vegetation-indices](/earth-engine/datasets/tags/vegetation-indices) [viirs](/earth-engine/datasets/tags/viirs) \n\nDescription \nThis dataset contains gridded daily Normalized Difference Vegetation Index\n(NDVI) derived from the NOAA Climate Data Record (CDR) of Visible Infrared\nImaging Radiometer Suite (VIIRS) Surface Reflectance. The data record spans\nfrom 2014 onward using data from NOAA polar orbiting\nsatellites. The data are projected on a 0.05 degree x 0.05 degree global\ngrid. This dataset is one of the Land Surface CDR products produced by the\nNASA Goddard Space Flight Center (GSFC) and the University of Maryland\n(UMD).\n\nKnown issues with this dataset include:\n\n- TIMEOFDAY variable contains values that are too large by 1 day\n\n- Latitude values are not correctly associated with the center of\n the grid cell, error is \\\u003c 0.002 degrees\n\n- Longitude values are not correctly associated with the center of\n the grid cell, error is \\\u003c 0.02 degrees\n\nSee [technical note from the data provider](https://www.ncei.noaa.gov/pub/data/sds/cdr/CDRs/Normalized_Difference_Vegetation_Index/VIIRS/AlgorithmDescriptionVIIRS_01B-20b.pdf).\n\nProvider's note: the orbital drift of N-19 (the last NOAA satellite\ncarrying the AVHRR sensor) began to severely degrade the retrieved\nproduct quality. Therefore, VIIRS is now the primary sensor being used for\nthese products from 2014-present.\n\nBands\n\n\n**Pixel Size**\n\n5566 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Scale | Pixel Size | Description |\n|-------------|-------|---------|--------|--------|------------|----------------------------------------|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|\n| `NDVI` | | -9998\\* | 9998\\* | 0.0001 | meters | Normalized difference vegetation index |\n| `TIMEOFDAY` | h | 0\\* | 2400\\* | 0.01 | meters | Hours since start of day |\n| `QA` | | | | | meters | Quality control bit flags |\n| Bitmask for QA - Bit 0: Unused - 0: No - 1: Yes - Bit 1: Pixel is cloudy - 0: No - 1: Yes - Bit 2: Pixel contains cloud shadow - 0: No - 1: Yes - Bit 3: Pixel is over water - 0: No - 1: Yes - Bit 4: Pixel is over sunglint - 0: No - 1: Yes - Bit 5: Pixel is over dense dark vegetation - 0: No - 1: Yes - Bit 6: Pixel is at night (high solar zenith) - 0: No - 1: Yes - Bit 7: Channels 1-5 are valid - 0: No - 1: Yes - Bit 8: Channel 1 value is invalid - 0: No - 1: Yes - Bit 9: Channel 2 value is invalid - 0: No - 1: Yes - Bit 10: Channel 3 value is invalid - 0: No - 1: Yes - Bit 11: Channel 4 value is invalid - 0: No - 1: Yes - Bit 12: Channel 5 value is invalid - 0: No - 1: Yes - Bit 13: RHO3 value is invalid - 0: No - 1: Yes - Bit 14: BRDF correction is invalid - 0: No - 1: Yes - Bit 15: Polar flag, latitude over 60 degrees (land) or 50 degrees (ocean) - 0: No - 1: Yes ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||\n\n\\* estimated min or max value\n\nImage Properties\n\n**Image Properties**\n\n| Name | Type | Description |\n|--------|--------|------------------------------|\n| status | STRING | 'provisional' or 'permanent' |\n\nTerms of Use\n\n**Terms of Use**\n\nThe NOAA CDR Program's official distribution point for CDRs is NOAA's\nNational Climatic Data Center which provides sustained, open access and\nactive data management of the CDR packages and related information in\nkeeping with the United States' open data policies and practices as\ndescribed in the President's Memorandum on \"Open Data Policy\" and pursuant\nto the Executive Order of May 9, 2013, \"Making Open and Machine Readable\nthe New Default for Government Information\". In line with these policies,\nthe CDR data sets are nonproprietary, publicly available, and no\nrestrictions are placed upon their use. For more information, see the\n[Fair Use of NOAA's CDR Data Sets, Algorithms and Documentation](https://www1.ncdc.noaa.gov/pub/data/sds/cdr/CDRs/Aerosol_Optical_Thickness/UseAgreement_01B-04.pdf)\npdf.\n\nCitations \nCitations:\n\n- Cite as: Vermote, Eric; NOAA CDR Program. (2022): NOAA Climate Data Record\n (CDR) of VIIRS Normalized Difference Vegetation Index (NDVI), Version 1.\n \\[indicate subset used\\]. NOAA National Centers for Environmental Information.\n [https://doi.org/10.25921/gakh-st76](https://www.ncei.noaa.gov/metadata/geoportal/rest/metadata/item/gov.noaa.ncdc:C01677/html)\n\nDOIs\n\n- \u003chttps://doi.org/10.25921/gakh-st76\u003e\n\nExplore with Earth Engine **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\nCode Editor (JavaScript) \n\n```javascript\nvar dataset = ee.ImageCollection('NOAA/CDR/VIIRS/NDVI/V1')\n .filter(ee.Filter.date('2018-05-01', '2018-06-01'));\nvar ndvi = dataset.select('NDVI');\nvar ndviVis = {\n min: -1000.0,\n max: 5000.0,\n palette: [\n 'ffffff', 'ce7e45', 'fcd163', 'c6ca02', '22cc04', '99b718', '207401',\n '012e01'\n ],\n};\nMap.setCenter(7.71, 17.93, 2);\nMap.addLayer(ndvi, ndviVis, 'NDVI');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NOAA/NOAA_CDR_VIIRS_NDVI_V1) \n[NOAA CDR VIIRS NDVI: Normalized Difference Vegetation Index, Version 1](/earth-engine/datasets/catalog/NOAA_CDR_VIIRS_NDVI_V1) \nThis dataset contains gridded daily Normalized Difference Vegetation Index (NDVI) derived from the NOAA Climate Data Record (CDR) of Visible Infrared Imaging Radiometer Suite (VIIRS) Surface Reflectance. The data record spans from 2014 onward using data from NOAA polar orbiting satellites. The data are projected on a 0.05 degree x ... \nNOAA/CDR/VIIRS/NDVI/V1, cdr,daily,land,ndvi,noaa,vegetation-indices,viirs \n2014-01-01T00:00:00Z/2025-08-22T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.25921/gakh-st76](https://doi.org/https://www.ncei.noaa.gov/products/climate-data-records/normalized-difference-vegetation-index)\n- [https://doi.org/10.25921/gakh-st76](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NOAA_CDR_VIIRS_NDVI_V1)"]]
