[null,null,[],[[["\u003cp\u003eThe NCEP/NCAR Reanalysis 1 project provides atmospheric data from 1948 to present with a 6-hour temporal and 2.5-degree spatial resolution.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset, provided by NCEP, offers insights into total column water vapor, valuable for climate and atmospheric studies.\u003c/p\u003e\n"],["\u003cp\u003eData is accessible via Earth Engine using the \u003ccode\u003eee.ImageCollection("NCEP_RE/surface_wv")\u003c/code\u003e snippet.\u003c/p\u003e\n"],["\u003cp\u003eThere are no restrictions on the use of this dataset.\u003c/p\u003e\n"]]],[],null,["Dataset Availability\n: 1948-01-01T00:00:00Z--2025-08-29T18:00:00Z\n\nDataset Provider\n:\n\n\n [NCEP](https://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis.html)\n\nCadence\n: 6 Hours\n\nTags\n:\n [atmosphere](/earth-engine/datasets/tags/atmosphere) [climate](/earth-engine/datasets/tags/climate) [geophysical](/earth-engine/datasets/tags/geophysical) [ncep](/earth-engine/datasets/tags/ncep) [noaa](/earth-engine/datasets/tags/noaa) [reanalysis](/earth-engine/datasets/tags/reanalysis) [vapor](/earth-engine/datasets/tags/vapor) \nprecipitable \n\nDescription \nThe NCEP/NCAR Reanalysis Project is a joint project between the National\nCenters for Environmental Prediction (NCEP, formerly \"NMC\") and the\nNational Center for Atmospheric Research (NCAR). The goal of this joint\neffort is to produce new atmospheric analyses using historical data as\nwell as to produce analyses of the current atmospheric state (Climate Data\nAssimilation System, CDAS). The NCEP/NCAR Reanalysis 1 project is using a\nstate-of-the-art analysis/forecast system to perform data assimilation using\npast data from 1948 to the present. The data have 6-hour temporal\nresolution (0000, 0600, 1200, and 1800 UTC) and 2.5 degree spatial\nresolution.\n\nBands\n\n\n**Pixel Size**\n\n278300 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|----------|---------|--------|--------|------------|--------------------------|\n| `pr_wtr` | kg/m\\^2 | -8.2\\* | 89.8\\* | meters | Total column water vapor |\n\n\\* estimated min or max value\n\nTerms of Use\n\n**Terms of Use**\n\nThere are no restrictions on the use of these datasets.\n\nCitations \nCitations:\n\n- Kalnay et al., 1996, The NCEP/NCAR 40-Year Reanalysis Project. Bull. Amer.\n Meteor. Soc., 77, 437-471.\n [doi:10.1175/1520-0477(1996)077](https://doi.org/10.1175/1520-0477(1996)077%3C0437:TNYRP%3E2.0.CO;2)[0437:TNYRP\\\\](/earth-engine/datasets/catalog/0437:TNYRP%5C)2.0.CO;2.\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('NCEP_RE/surface_wv')\n .filter(ee.Filter.date('2018-08-01', '2018-08-15'));\nvar totalColumnWaterVapor = dataset.select('pr_wtr');\nvar totalColumnWaterVaporVis = {\n min: 0.0,\n max: 60.0,\n palette: ['0000ff', '00ffff', '008000', 'ffff00', 'ff0000'],\n};\nMap.setCenter(-158.2, 2.81, 2);\nMap.addLayer(\n totalColumnWaterVapor, totalColumnWaterVaporVis,\n 'Total Column Water Vapor');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NCEP_RE/NCEP_RE_surface_wv) \n[NCEP/NCAR Reanalysis Data, Water Vapor](/earth-engine/datasets/catalog/NCEP_RE_surface_wv) \nThe NCEP/NCAR Reanalysis Project is a joint project between the National Centers for Environmental Prediction (NCEP, formerly \"NMC\") and the National Center for Atmospheric Research (NCAR). The goal of this joint effort is to produce new atmospheric analyses using historical data as well as to produce analyses of the current ... \nNCEP_RE/surface_wv, atmosphere,climate,geophysical,ncep,noaa,reanalysis,vapor \n1948-01-01T00:00:00Z/2025-08-29T18:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis.html)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NCEP_RE_surface_wv)"]]
