Chambers, D.P. 和 J.A. Bonin：Evaluation of Release 05 time-variable gravity coefficients over the ocean. Ocean Science 8,
859-868, 2012. doi:10.5194/os-8-859-2012。
Chambers D.P. 和 J. K. Willis：A Global Evaluation of Ocean Bottom Pressure from GRACE, OMCT, and Steric-Corrected Altimetry. J.
of Oceanic and Atmosph. Technology，第 27 卷，第 1395-1402 页，2010 年。
doi:10.1175/2010JTECHO738.1
[null,null,[],[[["\u003cp\u003eThe NASA/GRACE/MASS_GRIDS/OCEAN_EOFR dataset provides monthly gravitational anomalies relative to a 2004-2010 time-mean baseline, represented as "Equivalent Water Thickness" in centimeters.\u003c/p\u003e\n"],["\u003cp\u003eThis dataset is a filtered version of the GRACE Tellus Ocean dataset, optimized for examining regional ocean bottom pressure using Empirical Orthogonal Functions (EOFs).\u003c/p\u003e\n"],["\u003cp\u003eThe data, spanning from December 31, 2002, to December 10, 2016, offers insights into deviations of mass in terms of vertical extent of water, valuable for studying ocean dynamics.\u003c/p\u003e\n"],["\u003cp\u003eIt is crucial to note that this dataset is not intended for calculating global mean ocean mass due to its regional optimization.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset includes three bands representing equivalent liquid water thickness calculated by CSR, GFZ, and JPL, each with a resolution of 111320 meters.\u003c/p\u003e\n"]]],[],null,["# GRACE Monthly Mass Grids - Ocean EOFR\n\nDataset Availability\n: 2002-12-31T00:00:00Z--2016-12-10T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA Jet Propulsion Laboratory](https://grace.jpl.nasa.gov/data/get-data/monthly-mass-grids-ocean/)\n\nTags\n:\n[crs](/earth-engine/datasets/tags/crs) [gfz](/earth-engine/datasets/tags/gfz) [grace](/earth-engine/datasets/tags/grace) [gravity](/earth-engine/datasets/tags/gravity) [jpl](/earth-engine/datasets/tags/jpl) [mass](/earth-engine/datasets/tags/mass) [nasa](/earth-engine/datasets/tags/nasa) [ocean](/earth-engine/datasets/tags/ocean) [oceans](/earth-engine/datasets/tags/oceans) [tellus](/earth-engine/datasets/tags/tellus) [water](/earth-engine/datasets/tags/water) \n\n#### Description\n\nGRACE Tellus Monthly Mass Grids provides monthly\ngravitational anomalies relative to a 2004-2010 time-mean baseline.\nThe data contained in this dataset are units of \"Equivalent Water Thickness\"\nwhich represent the deviations of mass in terms of vertical extent\nof water in centimeters. See the provider's [Monthly Mass\nGrids Overview](https://grace.jpl.nasa.gov/data/monthly-mass-grids/)\nfor more details.\n\nThis dataset is a filtered version of the GRACE Tellus (GRCTellus)\nOcean dataset. The 'EOFR' bottom pressure (OBP) grids are obtained by\nprojecting the data from the regular GRC Ocean grids product\nonto the Empirical Orthogonal Functions (EOFs) of the\nOcean Model for Circulation and Tides (OMCT). This effectively\nfilters out signals in the GRACE data that are inconsistent\nwith the physics and OBP variations in the OMCT ocean model.\n\nThe EOFR filtered reconstructed OBP fields agree\nbetter with radar altimetric sea surface height,\nreduce leakage around ice sheets and glaciers, and reduce\nnoise in the mid latitudes where OBP variability is lower.\n[(Chambers and Willis, 2010)](https://doi.org/10.1175/2010JTECHO738.1)\n\n**Note**\n\n- The GRCTellus Ocean datasets are optimized to examine regional ocean bottom pressure, but NOT intended to be spatially averaged to determine global mean ocean mass.\n\n### Bands\n\n\n**Pixel Size**\n\n111320 meters\n\n**Bands**\n\n| Name | Units | Min | Max | Pixel Size | Description |\n|---------------------|-------|----------|---------|------------|---------------------------------------------------------------------|\n| `lwe_thickness_csr` | cm | -18.46\\* | 12.29\\* | meters | Equivalent liquid water thickness in centimeters calculated by CSR. |\n| `lwe_thickness_gfz` | cm | -15.37\\* | 14.56\\* | meters | Equivalent liquid water thickness in centimeters calculated by GFZ. |\n| `lwe_thickness_jpl` | cm | -16.59\\* | 11.7\\* | meters | Equivalent liquid water thickness in centimeters calculated by JPL. |\n\n\\* estimated min or max value\n\n### Image Properties\n\n**Image Properties**\n\n| Name | Type | Description |\n|----------------|--------|----------------------------------------------------------------------|\n| CSR_END_TIME | DOUBLE | End date in milliseconds of spherical harmonics solution from CSR. |\n| CSR_START_TIME | DOUBLE | Start date in milliseconds of spherical harmonics solution from CSR. |\n| GFZ_END_TIME | DOUBLE | End date in milliseconds of spherical harmonics solution from GFZ. |\n| GFZ_START_TIME | DOUBLE | Start date in milliseconds of spherical harmonics solution from GFZ. |\n| JPL_END_TIME | DOUBLE | End date in milliseconds of spherical harmonics solution from JPL. |\n| JPL_START_TIME | DOUBLE | Start date in milliseconds of spherical harmonics solution from JPL. |\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.P. Chambers. 2012. GRACE MONTHLY OCEAN MASS GRIDS NETCDF\n RELEASE 5.0. Ver. 5.0. PO.DAAC, CA, USA. Dataset accessed\n \\[YYYY-MM-DD\\] at [doi:10.5067/TEOCN-0N005](https://doi.org/10.5067/TEOCN-0N005).\n- Chambers, D.P. and J.A. Bonin: Evaluation of Release 05\n time-variable gravity coefficients over the ocean. Ocean Science 8,\n 859-868, 2012. [doi:10.5194/os-8-859-2012](https://doi.org/10.5194/os-8-859-2012).\n- Chambers D.P. and J. K. Willis: A Global Evaluation of Ocean Bottom\n Pressure from GRACE, OMCT, and Steric-Corrected Altimetry. J.\n of Oceanic and Atmosph. Technology, vol 27, pp 1395-1402, 2010..\n [doi:10.1175/2010JTECHO738.1](https://doi.org/10.1175/2010JTECHO738.1)\n\n### DOIs\n\n- \u003chttps://doi.org/10.1175/2010JTECHO738.1\u003e\n- \u003chttps://doi.org/10.5194/os-8-859-2012\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/OCEAN_EOFR')\n .filter(ee.Filter.date('2016-08-01', '2016-08-30'));\nvar equivalentWaterThicknessCsr = dataset.select('lwe_thickness_csr');\nvar equivalentWaterThicknessCsrVis = {\n min: -10.0,\n max: 10.0,\n};\nMap.setCenter(6.746, 46.529, 1);\nMap.addLayer(\n equivalentWaterThicknessCsr, equivalentWaterThicknessCsrVis,\n 'Equivalent Water Thickness CSR');\n```\n[Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_GRACE_MASS_GRIDS_OCEAN_EOFR) \n[GRACE Monthly Mass Grids - Ocean EOFR](/earth-engine/datasets/catalog/NASA_GRACE_MASS_GRIDS_OCEAN_EOFR) \nGRACE Tellus Monthly Mass Grids provides monthly gravitational anomalies relative to a 2004-2010 time-mean baseline. The data contained in this dataset are units of \"Equivalent Water Thickness\" which represent the deviations of mass in terms of vertical extent of water in centimeters. See the provider's Monthly Mass Grids Overview for ... \nNASA/GRACE/MASS_GRIDS/OCEAN_EOFR, crs,gfz,grace,gravity,jpl,mass,nasa,ocean,oceans,tellus,water \n2002-12-31T00:00:00Z/2016-12-10T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.5194/os-8-859-2012](https://doi.org/https://grace.jpl.nasa.gov/data/get-data/monthly-mass-grids-ocean/)\n- [https://doi.org/10.5194/os-8-859-2012](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_GRACE_MASS_GRIDS_OCEAN_EOFR)"]]
