Das Land Data Assimilation System (LDAS) kombiniert mehrere Beobachtungsquellen (z. B. Daten von Niederschlagsmessgeräten, Satellitendaten und Radarniederschlagsmessungen), um Schätzungen von klimatologischen Eigenschaften an oder nahe der Erdoberfläche zu erstellen.
Dieses Dataset ist die primäre (Standard-)Forcing-Datei (Datei A) für Phase 2 des North American Land Data Assimilation System (NLDAS-2).
Die Daten haben einen Rasterabstand von 1/8 Grad und eine stündliche zeitliche Auflösung.
NLDAS ist ein gemeinsames Projekt mehrerer Gruppen: des Environmental Modeling Center (EMC) von NOAA/NCEP, des Goddard Space Flight Center (GSFC) von NASA, der Princeton University, der University of Washington, des Office of Hydrological Development (OHD) von NOAA/NWS und des Climate Prediction Center (CPC) von NOAA/NCEP. NLDAS ist ein Kernprojekt, das vom Climate Prediction Program for the Americas (CPPA) der NOAA unterstützt wird.
Spezifische Luftfeuchtigkeit in 2 Metern Höhe über dem Boden
pressure
Pa
61.847,6*
105338*
Meter
Oberflächendruck
wind_u
m/s
–27,93*
27,54*
Meter
U-Windkomponente in 10 Metern Höhe über dem Boden
wind_v
m/s
–27,45*
35,13*
Meter
V-Windkomponente in 10 Metern Höhe über der Oberfläche
longwave_radiation
W/m^2
72,18*
545,11*
Meter
Langwellige Strahlung an der Erdoberfläche nach unten
convective_fraction
0*
1*
Meter
Anteil des gesamten Niederschlags, der konvektiv ist: aus NARR
potential_energy
J/kg
0*
76666.2*
Meter
Konvektive verfügbare potenzielle Energie (J/kg): aus NARR
potential_evaporation
kg/m²
0*
2.76*
Meter
Mögliche Verdunstung: aus NARR
total_precipitation
kg/m²
0*
124,19*
Meter
Stündlicher Gesamtniederschlag
shortwave_radiation
W/m^2
0*
1368,54*
Meter
Kurzwellige Strahlung an der Erdoberfläche – bias-korrigiert
* geschätzter Mindest- oder Höchstwert
Bildattribute
Bildattribute
Name
Typ
Beschreibung
end_hour
DOUBLE
Startzeit (Stunde)
start_hour
DOUBLE
Startzeit (Stunde)
Nutzungsbedingungen
Nutzungsbedingungen
Die Verteilung von Daten des Goddard Earth Sciences Data and Information Services Center (GES DISC) wird vom Science Mission Directorate (SMD) der NASA finanziert. Gemäß der NASA Earth Science Data and Information Policy sind Daten aus dem GES DISC-Archiv für die Nutzer-Community kostenlos verfügbar.
Weitere Informationen finden Sie auf der GES DISC-Seite Data Policy (Datenrichtlinie).
Zitate
Zitate:
Die Quelle des Datensatzes sollte bei der Verwendung der Daten richtig angegeben werden. Eine formale Referenz in der Form: \<authors\\>, 2012, zuletzt aktualisiert 2013: \. NASA/GSFC, Greenbelt, MD, USA, NASA Goddard Earth Sciences Data and Information Services Center (GES DISC).
Accessed \ at \<doi\\> is suggested following
Parsons et al. (2010), doi:10.1029/2010EO340001.</doi\\></authors\\>
Das Land Data Assimilation System (LDAS) kombiniert mehrere Beobachtungsquellen (z. B. Daten von Niederschlagsmessgeräten, Satellitendaten und Radarniederschlagsmessungen), um Schätzungen von klimatologischen Eigenschaften an oder in der Nähe der Erdoberfläche zu erstellen. Dieser Datensatz ist die primäre (Standard-)Datei für die Forcing-Variablen (Datei A) für Phase 2 des nordamerikanischen…
[null,null,[],[[["\u003cp\u003eThe NASA NLDAS FORA0125 H002 dataset provides hourly estimates of climatological properties like temperature, humidity, and precipitation across North America.\u003c/p\u003e\n"],["\u003cp\u003eIt combines observations from various sources, including precipitation gauges, satellite data, and radar measurements, to generate these estimates.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset covers the period from January 1, 1979, to December 9, 2024, with a spatial resolution of 1/8th degree.\u003c/p\u003e\n"],["\u003cp\u003eNLDAS is a collaborative project involving NOAA, NASA, and several universities, and it serves as the primary forcing dataset for the North American Land Data Assimilation System (NLDAS-2).\u003c/p\u003e\n"],["\u003cp\u003eData is freely accessible and can be used for research, education, and nonprofit purposes through platforms like Google Earth Engine.\u003c/p\u003e\n"]]],["The dataset, provided by NASA GES DISC, covers 1979-01-01 to 2025-02-18 with hourly cadence. It's the primary forcing file for NLDAS-2, offering 1/8th-degree grid spacing, and it compiles data from various sources like gauges, satellites, and radar. Key climatological properties are available, including temperature, humidity, pressure, wind, radiation, and precipitation, among others. The data is available for free use under NASA's Earth Science Data and Information Policy. Users can access and analyze the data using Google Earth Engine.\n"],null,["Dataset Availability\n: 1979-01-01T13:00:00Z--2025-09-01T12:00:00Z\n\nDataset Provider\n:\n\n\n [NASA GES DISC at NASA Goddard Space Flight Center](https://doi.org/10.5067/6J5LHHOHZHN4)\n\nCadence\n: 1 Hour\n\nTags\n:\n [climate](/earth-engine/datasets/tags/climate) [evaporation](/earth-engine/datasets/tags/evaporation) [forcing](/earth-engine/datasets/tags/forcing) [geophysical](/earth-engine/datasets/tags/geophysical) [hourly](/earth-engine/datasets/tags/hourly) [humidity](/earth-engine/datasets/tags/humidity) [ldas](/earth-engine/datasets/tags/ldas) [nasa](/earth-engine/datasets/tags/nasa) [precipitation](/earth-engine/datasets/tags/precipitation) [pressure](/earth-engine/datasets/tags/pressure) [radiation](/earth-engine/datasets/tags/radiation) [soil](/earth-engine/datasets/tags/soil) [temperature](/earth-engine/datasets/tags/temperature) [water-vapor](/earth-engine/datasets/tags/water-vapor) [wind](/earth-engine/datasets/tags/wind) \nnldas \n\nDescription \nLand Data Assimilation System (LDAS) combines multiple\nsources of observations (such as precipitation gauge data, satellite\ndata, and radar precipitation measurements) to produce estimates\nof climatological properties at or near the Earth''s surface.\n\nThis dataset is the primary (default) forcing file (File A) for\nPhase 2 of the North American Land Data Assimilation System (NLDAS-2).\nThe data are in 1/8th-degree grid spacing; the temporal resolution\nis hourly.\n\nNLDAS is a collaboration project among several groups: NOAA/NCEP''s\nEnvironmental Modeling Center (EMC), NASA''s Goddard Space Flight\nCenter (GSFC), Princeton University, the University of Washington,\nthe NOAA/NWS Office of Hydrological Development (OHD), and the\nNOAA/NCEP Climate Prediction Center (CPC). NLDAS is a core project\nwith support from NOAA''s Climate Prediction Program for the Americas\n(CPPA).\n\nDocumentation:\n\n- [Readme](https://hydro1.gesdisc.eosdis.nasa.gov/data/NLDAS/README.NLDAS2.pdf)\n\n- [How-To](https://disc.gsfc.nasa.gov/information/howto?tags=hydrology)\n\n- [GES DISC Hydrology Documentation](https://disc.gsfc.nasa.gov/information/documents?title=Hydrology%20Documentation)\n\n- [GES DISC Data Rods Documentation](https://disc.gsfc.nasa.gov/information/tools?title=Hydrology%20Data%20Rods)\n\nBands\n\n\n**Pixel Size**\n\n13915 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|-------------------------|---------------|-----------|-----------|------------|---------------------------------------------------------------|\n| `temperature` | °C | -49.79\\* | 51.2\\* | meters | Air temperature at 2 meters above the surface |\n| `specific_humidity` | Mass fraction | 0\\* | 0.02\\* | meters | Specific humidity at 2 meters above the surface |\n| `pressure` | Pa | 61847.6\\* | 105338\\* | meters | Surface pressure |\n| `wind_u` | m/s | -27.93\\* | 27.54\\* | meters | U wind component at 10 meters above the surface |\n| `wind_v` | m/s | -27.45\\* | 35.13\\* | meters | V wind component at 10 meters above the surface |\n| `longwave_radiation` | W/m\\^2 | 72.18\\* | 545.11\\* | meters | Surface downward longwave radiation |\n| `convective_fraction` | | 0\\* | 1\\* | meters | Fraction of total precipitation that is convective: from NARR |\n| `potential_energy` | J/kg | 0\\* | 76666.2\\* | meters | Convective available potential energy (J/kg): from NARR |\n| `potential_evaporation` | kg/m\\^2 | 0\\* | 2.76\\* | meters | Potential evaporation: from NARR |\n| `total_precipitation` | kg/m\\^2 | 0\\* | 124.19\\* | meters | Hourly total precipitation |\n| `shortwave_radiation` | W/m\\^2 | 0\\* | 1368.54\\* | meters | Surface downward shortwave radiation - bias corrected |\n\n\\* estimated min or max value\n\nImage Properties\n\n**Image Properties**\n\n| Name | Type | Description |\n|------------|--------|-------------|\n| end_hour | DOUBLE | End hour |\n| start_hour | DOUBLE | Start hour |\n\nTerms of Use\n\n**Terms of Use**\n\nDistribution of data from the Goddard Earth Sciences\nData and Information Services Center (GES DISC) is funded by NASA's\nScience Mission Directorate (SMD). Consistent with NASA [Earth\nScience Data and Information Policy](https://www.earthdata.nasa.gov/engage/open-data-services-and-software/data-and-information-policy/),\ndata from the GES DISC archive are available free to the user community.\nFor more information visit the GES DISC [Data Policy](https://disc.sci.gsfc.nasa.gov/citing)\npage.\n\nCitations \nCitations:\n\n- The data set source should be properly cited when the data are\n used. A formal reference of the form: \\\\, 2012, last updated 2013: \\\\. NASA/GSFC, Greenbelt, MD, USA, NASA Goddard Earth Sciences Data and Information Services Center (GES DISC). Accessed \\\\ at \\\\ is suggested following Parsons et al. (2010), [doi:10.1029/2010EO340001](https://doi.org/10.1029/2010EO340001).\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('NASA/NLDAS/FORA0125_H002')\n .filter(ee.Filter.date('2018-07-01', '2018-07-30'));\nvar temperature = dataset.select('temperature');\nvar temperatureVis = {\n min: -5.0,\n max: 40.0,\n palette: ['3d2bd8', '4e86da', '62c7d8', '91ed90', 'e4f178', 'ed6a4c'],\n};\nMap.setCenter(-110.21, 35.1, 4);\nMap.addLayer(temperature, temperatureVis, 'Temperature');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_NLDAS_FORA0125_H002) \n[NLDAS-2: North American Land Data Assimilation System Forcing Fields](/earth-engine/datasets/catalog/NASA_NLDAS_FORA0125_H002) \nLand Data Assimilation System (LDAS) combines multiple sources of observations (such as precipitation gauge data, satellite data, and radar precipitation measurements) to produce estimates of climatological properties at or near the Earth''s surface. This dataset is the primary (default) forcing file (File A) for Phase 2 of the North American ... \nNASA/NLDAS/FORA0125_H002, climate,evaporation,forcing,geophysical,hourly,humidity,ldas,nasa,precipitation,pressure,radiation,soil,temperature,water-vapor,wind \n1979-01-01T13:00:00Z/2025-09-01T12:00:00Z \n24.85 -125.15 53.28 -66.85 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://doi.org/10.5067/6J5LHHOHZHN4)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_NLDAS_FORA0125_H002)"]]
