NASA Global Land Data Assimilation System Version 2 (GLDAS-2) üç bileşenden oluşur: GLDAS-2.0, GLDAS-2.1 ve GLDAS-2.2. GLDAS-2.0, tamamen Princeton meteorolojik zorlama giriş verileriyle zorlanır ve 1948'den 2014'e kadar zamansal olarak tutarlı bir seri sağlar. GLDAS-2.1, 2000'den günümüze kadar olan model ve gözlem verilerinin bir kombinasyonuyla zorlanır. GLDAS-2.2 ürün paketleri veri asimilasyonu (DA) kullanırken GLDAS-2.0 ve GLDAS-2.1 ürünleri "açık döngü"dür (yani veri asimilasyonu yoktur). Verileri zorlama seçeneği ve DA gözlem kaynağı, değişkeni ve şeması farklı GLDAS-2.2 ürünleri için değişiklik gösterir.GLDAS-2.2, GES DISC arşivinde yeni bir üründür ve şu anda Şubat 2003'ten günümüze kadar Gravity Recovery and Climate Experiment (GRACE-DA) için Veri Asimilasyonu ile CLSM-F2.5'ten ana bir ürün içermektedir. GLDAS-2.2 verileri iki üretim akışında (ana ve erken) kullanılabilir. Yalnızca ana akış verileri alınır.
GLDAS-2.2 GRACE-DA ürünü, Land Information System (LIS) Sürüm 7'de Catchment-F2.5 ile simüle edilmiştir. Veri ürünü, 1 Şubat 2003'ten günümüze kadar 24 arazi yüzeyi alanı içerir.
Simülasyon, 1 Şubat 2003'te GLDAS-2.0 Günlük Havza modeli simülasyonundaki koşullar kullanılarak başlatıldı. Bu simülasyon, operasyonel Avrupa Orta Vadeli Hava Tahminleri Merkezi (ECMWF) Entegre Tahmin Sistemi'ndeki meteorolojik analiz alanlarıyla zorlandı. GRACE uydusundan elde edilen toplam karasal su anormalliği gözlemi asimile edildi (Li ve diğerleri, 2019). ECMWF ile yapılan veri sözleşmesi nedeniyle bu GLDAS-2.2 günlük ürününde meteorolojik zorlama alanları yer almaz.
Sağlayıcının Notu: _tavg uzantılı adlar, son 3 saat içinde ortalaması alınmış değişkenlerdir. "_acc" uzantılı adlar, son 3 saat içinde birikmiş değişkenlerdir. "_inst" uzantılı adlar anlık değişkenlerdir ve "_f" uzantılı adlar zorlama değişkenleridir.
Bantlar
Piksel Boyutu 27830 metre
Bantlar
Ad
Birimler
Min.
Maks.
Piksel Boyutu
Açıklama
ACond_tavg
m/sn
0,000379*
5,99291*
metre
Aerodinamik iletkenlik
AvgSurfT_tavg
K
179.818*
324.265*
metre
Ortalama yüzey deri sıcaklığı
CanopInt_tavg
kg/m^2
0*
1,57295*
metre
Bitki örtüsü yüzey suyu
ECanop_tavg
kg/m^2/s
-0,021881*
5,3e-05*
metre
Bitki örtüsündeki suyun buharlaşması
ESoil_tavg
kg/m^2/s
-0.003637*
0,001172*
metre
Çıplak topraktan doğrudan buharlaşma
EvapSnow_tavg
kg/m^2/s
-0,021057*
0,000728*
metre
Kar Buharlaşması
Evap_tavg
kg/m^2/s
-0,02737*
0,00121*
metre
Evapotranspirasyon
GWS_tavg
mm
77.0153*
3599,01*
metre
Yeraltı suyu depolama
Lwnet_tavg
W/m^2
-221.308*
490.842*
metre
Net uzun dalga radyasyon akısı
Qg_tavg
W/m^2
-344.072*
174.036*
metre
Isı akısı
Qh_tavg
W/m^2
-2851,75*
54.076,7*
metre
Hissedilir ısı net akısı
Qle_tavg
W/m^2
-53856,6*
2983,65*
metre
Gizli ısı net akısı
Qsb_tavg
kg/m^2/s
0*
0,000416*
metre
Taban akışı-yeraltı suyu akışı
Qsm_tavg
kg/m^2/s
0*
0,018311*
metre
Kar erimesi
Qs_tavg
kg/m^2/s
0*
0,020244*
metre
Yağmur suyu yüzey akışı
SnowDepth_tavg
dk.
0*
8,57951*
metre
Kar derinliği
SnowT_tavg
K
179.818*
324.265*
metre
Kar yüzeyi sıcaklığı
SoilMoist_P_tavg
kg/m^2
109.394*
4049,02*
metre
Profil Topraktaki nem
SoilMoist_RZ_tavg
kg/m^2
32,3665*
478.397*
metre
Kök bölgesi toprağındaki nem
SoilMoist_S_tavg
kg/m^2
0,001389*
9,56*
metre
Yüzeydeki toprağın nemi
SWE_tavg
kg/m^2
0*
3688,07*
metre
Kar derinliğinin su eşdeğeri
Swnet_tavg
W/m^2
0*
421.784*
metre
Net kısa dalga radyasyon akısı
TVeg_tavg
kg/m^2/s
-0,000371*
0,001654*
metre
Transpirasyon
TWS_tavg
mm
109.394*
5084,16*
metre
Yeryüzü su depolama alanı
* tahmini minimum veya maksimum değer
Resim Özellikleri
Resim Özellikleri
Ad
Tür
Açıklama
end_hour
ÇİFT
Bitiş saati
start_hour
ÇİFT
Başlangıç saati
Kullanım Şartları
Kullanım Şartları
Goddard Earth Sciences Data and Information Services Center (GES DISC) verilerinin dağıtımı, NASA'nın Science Mission Directorate (SMD) tarafından finanse edilir. NASA Earth Science Data and Information Policy (Dünya Bilimi Verileri ve Bilgi Politikası) ile tutarlı olarak,
GES DISC arşivindeki veriler kullanıcı topluluğuna ücretsiz olarak sunulur.
Daha fazla bilgi için GES DISC Veri Politikası sayfasını ziyaret edin.
Alıntılar
Alıntılar:
Li, B., M. Rodell, S. Kumar, H. Beaudoing, A. Getirana, B. F. Zaitchik ve diğerleri (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) üç bileşenden oluşur: GLDAS-2.0, GLDAS-2.1 ve GLDAS-2.2. GLDAS-2.0, tamamen Princeton meteorolojik zorlama giriş verileriyle zorlanır ve 1948'den 2014'e kadar zamansal olarak tutarlı bir seri sağlar. GLDAS-2.1, 2000'den itibaren model ve gözlem verilerinin bir kombinasyonuyla zorlanır.
[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)"]]
