NASA Global Land Data Assimilation System Versi 2 (GLDAS-2) memiliki tiga komponen: GLDAS-2.0, GLDAS-2.1, dan GLDAS-2.2. GLDAS-2.0 dipaksa sepenuhnya dengan data input paksa meteorologi Princeton dan menyediakan deret yang konsisten secara temporal dari tahun 1948 hingga 2014. GLDAS-2.1 dipaksa dengan kombinasi
data model dan pengamatan dari tahun 2000 hingga saat ini. Paket produk GLDAS-2.2 menggunakan asimilasi data (DA), sedangkan produk GLDAS-2.0 dan GLDAS-2.1 adalah "open-loop" (yaitu, tanpa asimilasi data). Pilihan untuk memaksakan data, serta sumber pengamatan DA, variabel, dan skema, bervariasi untuk berbagai produk GLDAS-2.2.GLDAS-2.2 baru ada di arsip GES DISC dan saat ini mencakup produk utama dari CLSM-F2.5 dengan Asimilasi Data untuk Gravity Recovery and Climate Experiment (GRACE-DA) dari Februari 2003 hingga saat ini. Data GLDAS-2.2
tersedia dalam dua aliran produksi: utama dan Awal, hanya aliran utama
yang di-ingest.
Produk GLDAS-2.2 GRACE-DA disimulasikan dengan Catchment-F2.5 di Land Information System (LIS) Versi 7. Produk data ini berisi 24 kolom permukaan daratan dari 1 Februari 2003 hingga saat ini.
Simulasi dimulai pada 1 Februari 2003 menggunakan kondisi dari simulasi model GLDAS-2.0 Daily Catchment, yang dipaksa dengan kolom analisis meteorologi dari Sistem Perkiraan Terintegrasi (IFS) European Centre for Medium-Range Weather Forecasts (ECMWF) operasional. Total pengamatan anomali air daratan dari satelit GRACE diasimilasi (Li et al, 2019). Karena perjanjian data dengan ECMWF, produk harian GLDAS-2.2 ini tidak menyertakan kolom paksaan meteorologi.
Catatan Penyedia: nama dengan ekstensi _tavg adalah variabel yang dirata-ratakan selama 3 jam terakhir, nama dengan ekstensi '_acc' adalah variabel yang diakumulasikan selama 3 jam terakhir, nama dengan ekstensi '_inst' adalah variabel instan, dan nama dengan '_f' adalah variabel paksa.
Band
Ukuran Piksel 27830 meter
Band
Nama
Unit
Min
Maks
Ukuran Piksel
Deskripsi
ACond_tavg
m/d
0.000379*
5.99291*
meter
Konduktansi aerodinamis
AvgSurfT_tavg
K
179.818*
324.265*
meter
Suhu kulit permukaan rata-rata
CanopInt_tavg
kg/m^2
0*
1,57295*
meter
Air permukaan kanopi tanaman
ECanop_tavg
kg/m^2/s
-0,021881*
5,3e-05*
meter
Penguapan air kanopi
ESoil_tavg
kg/m^2/s
-0,003637*
0.001172*
meter
Penguapan langsung dari tanah kosong
EvapSnow_tavg
kg/m^2/s
-0,021057*
0,000728*
meter
Penguapan Salju
Evap_tavg
kg/m^2/s
-0,02737*
0,00121*
meter
Evapotranspirasi
GWS_tavg
mm
77,0153*
3599.01*
meter
Penyimpanan air tanah
Lwnet_tavg
W/m^2
-221.308*
490.842*
meter
Fluks radiasi gelombang panjang bersih
Qg_tavg
W/m^2
-344.072*
174.036*
meter
Fluks kalor
Qh_tavg
W/m^2
-2851,75*
54076,7*
meter
Fluks bersih kalor masuk akal
Qle_tavg
W/m^2
-53856,6*
2983,65*
meter
Fluks bersih kalor laten
Qsb_tavg
kg/m^2/s
0*
0,000416*
meter
Aliran dasar-limpasan air tanah
Qsm_tavg
kg/m^2/s
0*
0,018311*
meter
Salju mencair
Qs_tavg
kg/m^2/s
0*
0.020244*
meter
Limpasan permukaan air hujan
SnowDepth_tavg
m
0*
8,57951*
meter
Ketebalan salju
SnowT_tavg
K
179.818*
324.265*
meter
Suhu Permukaan Salju
SoilMoist_P_tavg
kg/m^2
109.394*
4049.02*
meter
Profil Kelembapan tanah
SoilMoist_RZ_tavg
kg/m^2
32,3665*
478.397*
meter
Kelembapan Tanah Zona Akar
SoilMoist_S_tavg
kg/m^2
0,001389*
9,56*
meter
Kelembapan Tanah Permukaan
SWE_tavg
kg/m^2
0*
3688,07*
meter
Setara air dengan kedalaman salju
Swnet_tavg
W/m^2
0*
421.784*
meter
Fluks radiasi gelombang pendek bersih
TVeg_tavg
kg/m^2/s
-0,000371*
0.001654*
meter
Transpirasi
TWS_tavg
mm
109.394*
5084,16*
meter
Penyimpanan air di daratan
* perkiraan nilai min atau maks
Properti Gambar
Properti Gambar
Nama
Jenis
Deskripsi
end_hour
DOUBLE
Waktu akhir
start_hour
DOUBLE
Jam mulai
Persyaratan Penggunaan
Persyaratan Penggunaan
Distribusi data dari Goddard Earth Sciences Data and Information Services Center (GES DISC) didanai oleh Science Mission Directorate (SMD) NASA. Sesuai dengan Kebijakan Data dan Informasi Ilmu Bumi NASA, data dari arsip GES DISC tersedia gratis untuk komunitas pengguna.
Untuk mengetahui informasi selengkapnya, buka halaman Kebijakan Data GES DISC.
Kutipan
Kutipan:
Li, B., M. Rodell, S. Kumar, H. Beaudoing, A. Getirana, B. F. Zaitchik, et
al. (2019) Global GRACE data assimilation for groundwater and drought
monitoring: Advances and challenges. Water Resources Research, 55,
7564-7586.
NASA Global Land Data Assimilation System Version 2 (GLDAS-2) memiliki tiga komponen: GLDAS-2.0, GLDAS-2.1, dan GLDAS-2.2. GLDAS-2.0 dipaksa sepenuhnya dengan data input paksa meteorologi Princeton dan memberikan deret yang konsisten secara temporal dari tahun 1948 hingga 2014. GLDAS-2.1 dipaksa dengan kombinasi data model dan observasi dari tahun 2000 …
[null,null,[],[[["\u003cp\u003eThe NASA Global Land Data Assimilation System (GLDAS-2.2) dataset provides 3-hourly land surface fields, including soil moisture, temperature, and evapotranspiration, from February 2003 to present.\u003c/p\u003e\n"],["\u003cp\u003eGLDAS-2.2 uses data assimilation, incorporating observations from the Gravity Recovery and Climate Experiment (GRACE) satellite, to estimate terrestrial water storage and related variables.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset is available at a spatial resolution of 27830 meters and includes variables averaged, accumulated, and instantaneous over 3-hour intervals.\u003c/p\u003e\n"],["\u003cp\u003eGLDAS-2.2 is freely available through NASA's GES DISC and can be accessed and analyzed using Google Earth Engine.\u003c/p\u003e\n"],["\u003cp\u003eThis product is a component of the broader GLDAS-2 system, which also includes open-loop simulations (GLDAS-2.0 and GLDAS-2.1) covering earlier time periods.\u003c/p\u003e\n"]]],["The NASA GLDAS-2.2 dataset, provided by NASA GES DISC, offers daily land surface data from 2003-01-01 to 2024-11-30, simulated using the Catchment-F2.5 model with data assimilation. Key data includes 24 land surface fields, such as soil moisture, temperature, evaporation, and radiation, available with a 27830-meter pixel size. Data can be accessed via the Earth Engine using the provided code snippet. Data is free for research, education, and non-profit use.\n"],null,["# GLDAS-2.2: Global Land Data Assimilation System\n\nDataset Availability\n: 2003-01-01T03:00:00Z--2025-05-31T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA GES DISC at NASA Goddard Earth Sciences Data and Information Services Center](https://doi.org/10.5067/TXBMLX370XX8)\n\nCadence\n: 1 Day\n\nTags\n:\n[3-hourly](/earth-engine/datasets/tags/3-hourly) [climate](/earth-engine/datasets/tags/climate) [cryosphere](/earth-engine/datasets/tags/cryosphere) [evaporation](/earth-engine/datasets/tags/evaporation) [forcing](/earth-engine/datasets/tags/forcing) [geophysical](/earth-engine/datasets/tags/geophysical) [gldas](/earth-engine/datasets/tags/gldas) [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) [soil-moisture](/earth-engine/datasets/tags/soil-moisture) [surface](/earth-engine/datasets/tags/surface) [temperature](/earth-engine/datasets/tags/temperature) [water-vapor](/earth-engine/datasets/tags/water-vapor) [wind](/earth-engine/datasets/tags/wind) \n\n#### Description\n\nNASA Global Land Data Assimilation System Version 2 (GLDAS-2) has three\ncomponents: GLDAS-2.0, GLDAS-2.1, and GLDAS-2.2. GLDAS-2.0 is forced entirely\nwith the Princeton meteorological forcing input data and provides a temporally\nconsistent series from 1948 through 2014. GLDAS-2.1 is forced with a combination\nof model and observation data from 2000 to present. GLDAS-2.2 product suites use\ndata assimilation (DA), whereas the GLDAS-2.0 and GLDAS-2.1 products are\n\"open-loop\" (i.e., no data assimilation). The choice of forcing data, as well as\nDA observation source, variable, and scheme, vary for different GLDAS-2.2\nproducts.GLDAS-2.2 is new to the GES DISC archive and currently includes a main\nproduct from CLSM-F2.5 with Data Assimilation for the Gravity Recovery and\nClimate Experiment (GRACE-DA) from February 2003 to present. The GLDAS-2.2\ndata are available in two production streams: main and Early, only main one\nis ingested.\n\nThe GLDAS-2.2 GRACE-DA product was simulated with Catchment-F2.5 in Land\nInformation System (LIS) Version 7. The data product contains 24 land\nsurface fields from February 1, 2003 to present.\n\nThe simulation started on February 1, 2003 using the conditions from the\nGLDAS-2.0 Daily Catchment model simulation, forced with the meteorological\nanalysis fields from the operational European Centre for Medium-Range\nWeather Forecasts (ECMWF) Integrated Forecasting System. The total\nterrestrial water anomaly observation from GRACE satellite was assimilated\n(Li et al, 2019). Due to the data agreement with ECMWF, this GLDAS-2.2 daily\nproduct does not include the meteorological forcing fields.\n\nDocumentation:\n\n- [Readme](https://hydro1.gesdisc.eosdis.nasa.gov/data/GLDAS/GLDAS_CLSM025_DA1_D.2.2/doc/README_GLDAS2.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\nProvider's Note: the names with extension _tavg are variables\naveraged over the past 3-hours, the names with extension '_acc' are\nvariables accumulated over the past 3-hours, the names with extension\n'_inst' are instantaneous variables, and the names with '_f' are\nforcing variables.\n\n### Bands\n\n\n**Pixel Size**\n\n27830 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|---------------------|-----------|-------------|------------|------------|-----------------------------------|\n| `ACond_tavg` | m/s | 0.000379\\* | 5.99291\\* | meters | Aerodynamic conductance |\n| `AvgSurfT_tavg` | K | 179.818\\* | 324.265\\* | meters | Average surface skin temperature |\n| `CanopInt_tavg` | kg/m\\^2 | 0\\* | 1.57295\\* | meters | Plant canopy surface water |\n| `ECanop_tavg` | kg/m\\^2/s | -0.021881\\* | 5.3e-05\\* | meters | Canopy water evaporation |\n| `ESoil_tavg` | kg/m\\^2/s | -0.003637\\* | 0.001172\\* | meters | Direct evaporation from bare soil |\n| `EvapSnow_tavg` | kg/m\\^2/s | -0.021057\\* | 0.000728\\* | meters | Snow Evaporation |\n| `Evap_tavg` | kg/m\\^2/s | -0.02737\\* | 0.00121\\* | meters | Evapotranspiration |\n| `GWS_tavg` | mm | 77.0153\\* | 3599.01\\* | meters | Ground water storage |\n| `Lwnet_tavg` | W/m\\^2 | -221.308\\* | 490.842\\* | meters | Net long-wave radiation flux |\n| `Qg_tavg` | W/m\\^2 | -344.072\\* | 174.036\\* | meters | Heat flux |\n| `Qh_tavg` | W/m\\^2 | -2851.75\\* | 54076.7\\* | meters | Sensible heat net flux |\n| `Qle_tavg` | W/m\\^2 | -53856.6\\* | 2983.65\\* | meters | Latent heat net flux |\n| `Qsb_tavg` | kg/m\\^2/s | 0\\* | 0.000416\\* | meters | Baseflow-groundwater runoff |\n| `Qsm_tavg` | kg/m\\^2/s | 0\\* | 0.018311\\* | meters | Snow melt |\n| `Qs_tavg` | kg/m\\^2/s | 0\\* | 0.020244\\* | meters | Storm surface runoff |\n| `SnowDepth_tavg` | m | 0\\* | 8.57951\\* | meters | Snow depth |\n| `SnowT_tavg` | K | 179.818\\* | 324.265\\* | meters | Snow Surface temperature |\n| `SoilMoist_P_tavg` | kg/m\\^2 | 109.394\\* | 4049.02\\* | meters | Profile Soil moisture |\n| `SoilMoist_RZ_tavg` | kg/m\\^2 | 32.3665\\* | 478.397\\* | meters | Root Zone Soil moisture |\n| `SoilMoist_S_tavg` | kg/m\\^2 | 0.001389\\* | 9.56\\* | meters | Surface Soil moisture |\n| `SWE_tavg` | kg/m\\^2 | 0\\* | 3688.07\\* | meters | Snow depth water equivalent |\n| `Swnet_tavg` | W/m\\^2 | 0\\* | 421.784\\* | meters | Net short wave radiation flux |\n| `TVeg_tavg` | kg/m\\^2/s | -0.000371\\* | 0.001654\\* | meters | Transpiration |\n| `TWS_tavg` | mm | 109.394\\* | 5084.16\\* | meters | Terrestrial water storage |\n\n\\* estimated min or max value\n\n### Image Properties\n\n**Image Properties**\n\n| Name | Type | Description |\n|------------|--------|-------------|\n| end_hour | DOUBLE | End hour |\n| start_hour | DOUBLE | Start hour |\n\n### Terms 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\n### Citations\n\nCitations:\n\n- Li, B., M. Rodell, S. Kumar, H. Beaudoing, A. Getirana, B. F. Zaitchik, et\n al. (2019) Global GRACE data assimilation for groundwater and drought\n monitoring: Advances and challenges. Water Resources Research, 55,\n 7564-7586.\n- [Additional references](https://ldas.gsfc.nasa.gov/gldas/GLDASpublications.php)\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('NASA/GLDAS/V022/CLSM/G025/DA1D')\n .filter(ee.Filter.date('2010-06-01', '2010-06-02'));\nvar averageSurfaceSkinTemperatureK = dataset.select('AvgSurfT_tavg');\nvar averageSurfaceSkinTemperatureKVis = {\n min: 258,\n max: 316,\n palette: ['1303ff', '42fff6', 'f3ff40', 'ff5d0f'],\n};\nMap.setCenter(71.72, 52.48, 3.0);\nMap.addLayer(\n averageSurfaceSkinTemperatureK, averageSurfaceSkinTemperatureKVis,\n 'Average Surface Skin Temperature [K]');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_GLDAS_V022_CLSM_G025_DA1D) \n[GLDAS-2.2: Global Land Data Assimilation System](/earth-engine/datasets/catalog/NASA_GLDAS_V022_CLSM_G025_DA1D) \nNASA Global Land Data Assimilation System Version 2 (GLDAS-2) has three components: GLDAS-2.0, GLDAS-2.1, and GLDAS-2.2. GLDAS-2.0 is forced entirely with the Princeton meteorological forcing input data and provides a temporally consistent series from 1948 through 2014. GLDAS-2.1 is forced with a combination of model and observation data from 2000 ... \nNASA/GLDAS/V022/CLSM/G025/DA1D, 3-hourly,climate,cryosphere,evaporation,forcing,geophysical,gldas,humidity,ldas,nasa,precipitation,pressure,radiation,soil,soil-moisture,surface,temperature,water-vapor,wind \n2003-01-01T03:00:00Z/2025-05-31T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [](https://doi.org/https://doi.org/10.5067/TXBMLX370XX8)\n- [](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_GLDAS_V022_CLSM_G025_DA1D)"]]
