Questo set di dati contiene anomalie mensili della quantità/altezza dell'acqua globale con griglia
rispetto a una media temporale, derivate da GRACE e GRACE-FO ed elaborate presso
il JPL utilizzando l'approccio Mascon (RL06.3Mv04). Questi dati vengono forniti in un unico file di dati in formato netCDF e possono essere utilizzati per l'analisi di fenomeni oceanici, di ghiaccio e idrologici. Le anomalie di accumulo/altezza dell'acqua sono indicate
in unità di spessore d'acqua equivalente (cm). La soluzione fornita qui
deriva dalla risoluzione delle variazioni mensili del campo gravitazionale in termini di
funzioni di concentrazione di massa del cappuccio sferico geolocalizzato, anziché di coefficienti armonici sferici globali. Inoltre, durante l'inversione della soluzione vengono introdotte informazioni
geofisiche realistiche per rimuovere intrinsecamente l'errore correlato. Pertanto, queste griglie Mascon non devono essere
decorrelate o smussate, come le tradizionali soluzioni di gravità armonica sferica.
La soluzione Mascon completa è costituita da 4551 stime relativamente
indipendenti della variazione della massa superficiale,derivate utilizzando una
griglia di mascon individuali di 3 gradi di uguale area. Tieni presente che questo
set di dati non corregge gli errori di dispersione lungo le coste, pertanto
è consigliato solo agli utenti che vogliono applicare il proprio algoritmo
per separare la massa terrestre da quella oceanica molto vicino alle coste.
Per ulteriori informazioni, visita la pagina del GRACE.
Per una descrizione dettagliata della soluzione Mascon, inclusi
la derivazione matematica, l'implementazione di vincoli geofisici e
la convalida della soluzione, consulta Watkins et al., 2015.
Questo prodotto è destinato esclusivamente all'uso da parte di esperti; gli altri utenti sono invitati a
utilizzare il set di dati Mascon filtrato in base all'indice CRI.
Spessore equivalente di acqua liquida in centimetri.
uncertainty
metri
Incertezza di 1 sigma per ogni stima di mascon di 3 gradi.
Le stime di incertezza fornite sono considerate conservative.
Consulta la sezione Error & Uncertainty Estimatesdel fornitore
Termini e condizioni d'uso
Termini e condizioni d'uso
Tutti i dati prodotti dalla NASA nell'ambito della missione GRACE sono resi disponibili senza costi
per l'utilizzo da parte del pubblico. Quando utilizzi i dati GRCTellus, aggiungi un riconoscimento: "Le terre GRACE sono disponibili all'indirizzo https://grace.jpl.nasa.gov, supportate dal programma NASA MEaSUREs" e cita le citazioni fornite.
Citazioni
Citazioni:
D. N. Wiese, D.-N. Yuan, C. Boening, F. W. Landerer, M. M. Watkins. 2023.
JPL GRACE e GRACE-FO Mascon Ocean, Ice, and Hydrology Equivalent Water
Height JPL RL06.3Mv04. Versione RL06.3Mv04. PO.DAAC, CA, USA. Dataset consultato
[AAAA-MM-GG] su
https://doi.org/10.5067/TEMSC-3MJ634.
Watkins, M. M., D. N. Wiese, D.-N. Yuan, C. Boening e F. W.
Landerer (2015), Improved methods for observing Earth's time variable mass,
mass distribution with GRACE using spherical cap mascons, J. Geophys. Res
Solid Earth, 120,
doi:10.1002/2014JB011547.
Wiese, D. N., F. W. Landerer e M. M. Watkins (2016),
Quantifying and reducing leakage errors in the JPL RL05M GRACE
mascon solution, Water Resour. Res., 52, 7490-7502,
doi:10.1002/2016WR019344.
Questo set di dati contiene anomalie mensili globali di altezza/accumulo di acqua grigliate rispetto a una media temporale, derivate da GRACE e GRACE-FO ed elaborate al JPL utilizzando l'approccio Mascon (RL06.3Mv04). Questi dati vengono forniti in un unico file di dati in formato netCDF e possono essere utilizzati per l'analisi di oceani, ghiaccio e idrologia…
[null,null,[],[[["\u003cp\u003eThis dataset offers monthly global water storage and height anomalies, derived from GRACE and GRACE-FO and processed by NASA's JPL, utilizing the Mascon approach (RL06.3Mv04) between the dates of 2002-03-31T00:00:00Z and 2024-09-30T00:00:00Z.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset provides water storage and height anomalies in equivalent water thickness units (cm) and includes uncertainty measurements, with the data being useful for analyzing ocean, ice, and hydrological phenomena, and is presented in a single netCDF formatted file.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset consists of 4,551 independent estimates of surface mass change on an equal-area 3-degree grid, and it is important to note that this dataset does not correct for leakage errors across coastlines, so custom algorithms are recommended for users needing to differentiate land and ocean mass near coastlines.\u003c/p\u003e\n"],["\u003cp\u003eThe data is accessible via Google Earth Engine using the code snippet \u003ccode\u003eee.ImageCollection("NASA/GRACE/MASS_GRIDS_V04/MASCON")\u003c/code\u003e and is available for free public use, with the requirement to acknowledge the GRACE mission and cite the provided publications when utilized.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset is an updated version of the prior Tellus JPL Mascon RL06.1Mv03, and is intended for expert use, however there is a link provided for less advanced users to navigate toward a more suitable dataset.\u003c/p\u003e\n"]]],[],null,["# GRACE Monthly Mass Grids Release 6.3 Version 4 - Global Mascons\n\nDataset Availability\n: 2002-03-31T00:00:00Z--2024-09-30T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA Jet Propulsion Laboratory](https://grace.jpl.nasa.gov/data/get-data/jpl_global_mascons/)\n\nTags\n:\n[grace](/earth-engine/datasets/tags/grace) [gravity](/earth-engine/datasets/tags/gravity) [jpl](/earth-engine/datasets/tags/jpl) [mascon](/earth-engine/datasets/tags/mascon) [mass](/earth-engine/datasets/tags/mass) [nasa](/earth-engine/datasets/tags/nasa) [surface-ground-water](/earth-engine/datasets/tags/surface-ground-water) [tellus](/earth-engine/datasets/tags/tellus) [water](/earth-engine/datasets/tags/water) \n\n#### Description\n\nThis dataset contains gridded monthly global water storage/height anomalies\nrelative to a time-mean, derived from GRACE and GRACE-FO and processed at\nJPL using the Mascon approach (RL06.3Mv04). These data are provided in a\nsingle data file in netCDF format, and can be used for analysis for ocean,\nice, and hydrology phenomena. The water storage/height anomalies are given\nin equivalent water thickness units (cm). The solution provided here is\nderived from solving for monthly gravity field variations in terms of\ngeolocated spherical cap mass concentration functions, rather than global\nspherical harmonic coefficients. Additionally, realistic geophysical\ninformation is introduced during the solution inversion to intrinsically\nremove correlated error. Thus, these Mascon grids do not need to be\nde-correlated or smoothed, like traditional spherical harmonic gravity\nsolutions.\n\nThe complete Mascon solution consists of 4,551 relatively\nindependent estimates of surface mass change that have been derived using an\nequal-area 3-degree grid of individual mascons. It should be noted that this\ndataset does not correct for leakage errors across coastlines; it is\ntherefore recommended only for users who want to apply their own algorithm\nto separate between land and ocean mass very near coastlines.\n\nFor more information, please visit [GRACE page](https://grace.jpl.nasa.gov/data/get-data/jpl_global_mascons/).\nFor a detailed description on the Mascon solution, including\nthe mathematical derivation, implementation of geophysical constraints, and\nsolution validation, please see [Watkins et al., 2015](https://doi.org/10.1002/2014JB011547).\nThis product is intended for expert use only; other users are encouraged to\nuse the [CRI-filtered Mascon dataset](https://podaac.jpl.nasa.gov/dataset/TELLUS_GRAC-GRFO_MASCON_CRI_GRID_RL06.3_V4).\n\nThis RL06.3Mv04 is an updated version of the previous [Tellus JPL Mascon\nRL06.1Mv03](https://doi.org/10.5067/TEMSC-3MJ63).\n\n### Bands\n\n\n**Pixel Size**\n\n55660 meters\n\n**Bands**\n\n| Name | Units | Pixel Size | Description |\n|-----------------|-------|------------|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|\n| `lwe_thickness` | cm | meters | Equivalent liquid water thickness in centimeters. |\n| `uncertainty` | | meters | 1-sigma uncertainty for each 3-degree mascon estimate. The provided estimates of uncertainty are regarded to be conservative. See the provider's [Error \\& Uncertainty Estimates section](https://grace.jpl.nasa.gov/data/get-data/jpl_global_mascons/) |\n\n### Terms of Use\n\n**Terms of Use**\n\nAll NASA-produced data from the GRACE mission is made freely available\nfor the public to use. When using any of the GRCTellus data, please\nadd an acknowledgment: \"GRACE land are available at\n\u003chttps://grace.jpl.nasa.gov\u003e,\nsupported by the NASA MEaSUREs Program.\" and cite with the\ncitations provided.\n\n### Citations\n\nCitations:\n\n- D. N. Wiese, D.-N. Yuan, C. Boening, F. W. Landerer, M. M. Watkins. 2023.\n JPL GRACE and GRACE-FO Mascon Ocean, Ice, and Hydrology Equivalent Water\n Height JPL RL06.3Mv04. Ver. RL06.3Mv04. PO.DAAC, CA, USA. Dataset accessed\n \\[YYYY-MM-DD\\] at\n \u003chttps://doi.org/10.5067/TEMSC-3MJ634\u003e.\n- Watkins, M. M., D. N. Wiese, D.-N. Yuan, C. Boening, and F. W.\n Landerer (2015), Improved methods for observing Earth's time variable mass,\n mass distribution with GRACE using spherical cap mascons, J. Geophys. Res\n Solid Earth, 120,\n [doi:10.1002/2014JB011547](https://doi.org/10.1002/2014JB011547).\n- Wiese, D. N., F. W. Landerer, and M. M. Watkins (2016),\n Quantifying and reducing leakage errors in the JPL RL05M GRACE\n mascon solution, Water Resour. Res., 52, 7490-7502,\n [doi:10.1002/2016WR019344](https://doi.org/10.1002/2016WR019344).\n\n### DOIs\n\n- \u003chttps://doi.org/10.1002/2014JB011547\u003e\n- \u003chttps://doi.org/10.1002/2016WR019344\u003e\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/GRACE/MASS_GRIDS_V04/MASCON')\n .filter(ee.Filter.date('2016-08-01', '2016-08-30'));\nvar equivalentWaterThickness = dataset.select('lwe_thickness');\nvar equivalentWaterThicknessVis = {\n min: -25.0,\n max: 25.0,\n palette: ['001137', '01abab', 'e7eb05', '620500'],\n};\nMap.setCenter(6.746, 46.529, 2);\nMap.addLayer(\n equivalentWaterThickness, equivalentWaterThicknessVis,\n 'Equivalent Water Thickness');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_GRACE_MASS_GRIDS_V04_MASCON) \n[GRACE Monthly Mass Grids Release 6.3 Version 4 - Global Mascons](/earth-engine/datasets/catalog/NASA_GRACE_MASS_GRIDS_V04_MASCON) \nThis dataset contains gridded monthly global water storage/height anomalies relative to a time-mean, derived from GRACE and GRACE-FO and processed at JPL using the Mascon approach (RL06.3Mv04). These data are provided in a single data file in netCDF format, and can be used for analysis for ocean, ice, and hydrology ... \nNASA/GRACE/MASS_GRIDS_V04/MASCON, grace,gravity,jpl,mascon,mass,nasa,surface-ground-water,tellus,water \n2002-03-31T00:00:00Z/2024-09-30T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.1002/2016WR019344](https://doi.org/https://grace.jpl.nasa.gov/data/get-data/jpl_global_mascons/)\n- [https://doi.org/10.1002/2016WR019344](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_GRACE_MASS_GRIDS_V04_MASCON)"]]
