NLDAS-2: North American Land Data Assimilation System Forcing Fields (NASA/NLDAS/FORA0125_H002)

Land 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 Land Data Assimilation System (NLDAS-2). The data are in 1/8th-degree grid spacing; the temporal resolution is hourly.
NLDAS is a collaboration project among several groups: NOAA/NCEP’s Environmental Modeling Center (EMC), NASA’s Goddard Space Flight Center (GSFC), Princeton University, the University of Washington, the NOAA/NWS Office of Hydrological Development (OHD), and the NOAA/NCEP Climate Prediction Center (CPC). NLDAS is a core project with support from NOAA’s Climate Prediction Program for the Americas (CPPA).

NameDescriptionGee Unit
temperatureAir temperature at 2 meters above the surface°C
specific_humiditySpecific humidity at 2 meters above the surfacekg/kg
pressureSurface pressurePa
wind_uU wind component at 10 meters above the surfacem/s
wind_vV wind component at 10 meters above the surfacem/s
longwave_radiationSurface downward longwave radiationW/m^2
convective_fractionFraction of total precipitation that is convective: from NARR
potential_energyConvective available potential energy (J/kg): from NARRJ/kg
potential_evaporationPotential evaporation: from NARRkg/m^2
total_precipitationHourly total precipitationkg/m^2
shortwave_radiationSurface downward shortwave radiation - bias correctedW/m^2


NASA (producer, licensor)
Google Earth Engine (host)
STAC Version 0.6.0
Keywords climate, evaporation, forcing, geophysical, hourly, humidity, ldas, nasa, nldas, precipitation, pressure, radiation, temperature, wind
License proprietary
Temporal Extent 12/31/1978, 4:00:00 PM - now
Citation The data set source should be properly cited when the data are used. A formal reference of the form: <authors>, 2012, last updated 2013: <dataset name>. NASA/GSFC, Greenbelt, MD, USA, NASA Goddard Earth Sciences Data and Information Services Center (GES DISC). Accessed <enter user data access date> at <DOI> is suggested following Parsons et al. (2010), DOI:
Type image_collection
GSD arc degreesm
Cadence hour
Asset schema {"name":"end_hour","description":"End hour","type":"DOUBLE"},{"name":"start_hour","description":"Start hour","type":"DOUBLE"}