![NASA/GRACE/MASS_GRIDS_V04/OCEAN](https://developers.google.com/earth-engine/datasets/images/NASA/NASA_GRACE_MASS_GRIDS_V04_OCEAN_sample.png) Dataset Availability : 2002-04-04T00:00:00Z--2017-10-25T00:00:00Z Dataset Producer : [NASA Jet Propulsion Laboratory](https://grace.jpl.nasa.gov/data/get-data/monthly-mass-grids-ocean/) Tags : [crs](https://developers.google.com/earth-engine/datasets/tags/crs) [gfz](https://developers.google.com/earth-engine/datasets/tags/gfz) [grace](https://developers.google.com/earth-engine/datasets/tags/grace) [gravity](https://developers.google.com/earth-engine/datasets/tags/gravity) [jpl](https://developers.google.com/earth-engine/datasets/tags/jpl) [mass](https://developers.google.com/earth-engine/datasets/tags/mass) [nasa](https://developers.google.com/earth-engine/datasets/tags/nasa) [oceans](https://developers.google.com/earth-engine/datasets/tags/oceans) [tellus](https://developers.google.com/earth-engine/datasets/tags/tellus) [water](https://developers.google.com/earth-engine/datasets/tags/water) #### Description GRACE 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](https://grace.jpl.nasa.gov/data/monthly-mass-grids/) for more details. The GRACE Tellus (GRCTellus) Monthly Mass Grids Ocean dataset is produced by three centers: CSR (U. Texas / Center for Space Research), GFZ (GeoForschungsZentrum Potsdam), and JPL (NASA Jet Propulsion Laboratory). Each center is a part of the GRACE Ground System and generates Level-2 data (spherical harmonic fields) used in this dataset. The output includes spherical harmonic coefficients of the gravity field and of the dealiasing fields used to compute them. Since each center independently produces the coefficients, the results may be slightly different. It is recommended for most users to use the mean of all three datasets. See the provider's [choosing a solution](https://grace.jpl.nasa.gov/data/choosing-a-solution/) page for more details. **Note** - Land leakage correction: Ocean signals are typically weaker than land signals, by factors of 2 and more, on seasonal and interannual time scales. To minimize leakage from high land signals onto ocean signals, a destriping filter has been applied which may cause cause correlations over much larger distances. - 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. ### Bands **Bands** Pixel size: 111320 meters (all bands) | Name | Units | Pixel Size | Description | |---|---|---|---| | `lwe_thickness_csr` | cm | 111320 meters | Equivalent liquid water thickness in centimeters calculated by CSR. | | `lwe_thickness_gfz` | cm | 111320 meters | Equivalent liquid water thickness in centimeters calculated by GFZ. | | `lwe_thickness_jpl` | cm | 111320 meters | Equivalent liquid water thickness in centimeters calculated by JPL. | | `uncertainty_csr` | | 111320 meters | Error estimation by CSR. | | `uncertainty_gfz` | | 111320 meters | Error estimation by GFZ. | | `uncertainty_jpl` | | 111320 meters | Error estimation by JPL. | ### Image Properties **Image Properties** | Name | Type | Description | |---|---|---| | CSR_END_TIME | DOUBLE | End date in milliseconds of spherical harmonics solution from CSR. | | CSR_START_TIME | DOUBLE | Start date in milliseconds of spherical harmonics solution from CSR. | | GFZ_END_TIME | DOUBLE | End date in milliseconds of spherical harmonics solution from GFZ. | | GFZ_START_TIME | DOUBLE | Start date in milliseconds of spherical harmonics solution from GFZ. | | JPL_END_TIME | DOUBLE | End date in milliseconds of spherical harmonics solution from JPL. | | JPL_START_TIME | DOUBLE | Start date in milliseconds of spherical harmonics solution from JPL. | ### Terms of Use **Terms of Use** All NASA-produced data from the GRACE mission is made freely available for the public to use. When using any of the GRCTellus data, please add an acknowledgment: "GRACE land are available at , supported by the NASA MEaSUREs Program." and cite with the citations provided. ### Citations Citations: - D.P. Chambers. 2012. GRACE MONTHLY OCEAN MASS GRIDS NETCDF RELEASE 6.0. Ver. 4.0. PO.DAAC, CA, USA. Dataset accessed \[YYYY-MM-DD\] at . - Chambers, D.P. and J.A. Bonin: Evaluation of Release 05 time-variable gravity coefficients over the ocean. Ocean Science 8, 859-868, 2012. . - Chambers D.P. and J. K. Willis: A Global Evaluation of Ocean Bottom Pressure from GRACE, OMCT, and Steric-Corrected Altimetry. J. of Oceanic and Atmosph. Technology, vol 27, pp 1395-1402. [doi:10.1175/2010JTECHO738.1](https://doi.org/10.1175/2010JTECHO738.1), 2010. ### DOIs - ### Explore with Earth Engine > [!NOTE] > **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) ### Code Editor (JavaScript) ```javascript var dataset = ee.Image('NASA/GRACE/MASS_GRIDS_V04/OCEAN/20020403_20020430'); var equivalentWaterThicknessCsr = dataset.select('lwe_thickness_csr'); var uncertainty = dataset.select('uncertainty_csr'); var equivalentWaterThicknessCsrVis = { min: -0.0799629208930322, max: 0.07938676715178997, palette: ['001137', '01abab', 'e7eb05', '620500'] }; // Visualization parameters for uncertainty bands (typically positive values) var uncertaintyVis = { min: 0.01, max: 0.02, palette: ['001137', '01abab', 'e7eb05', '620500'] }; Map.setCenter(6.746, 46.529, 1); Map.addLayer( equivalentWaterThicknessCsr, equivalentWaterThicknessCsrVis, 'Equivalent Water Thickness CSR'); Map.addLayer(uncertainty, uncertaintyVis, 'Uncertainty CSR'); ``` [Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/NASA/NASA_GRACE_MASS_GRIDS_V04_OCEAN) [GRACE Monthly Mass Grids Release 06 Version 04 - Ocean](https://developers.google.com/earth-engine/datasets/catalog/NASA_GRACE_MASS_GRIDS_V04_OCEAN) GRACE 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 ... NASA/GRACE/MASS_GRIDS_V04/OCEAN, crs,gfz,grace,gravity,jpl,mass,nasa,oceans,tellus,water 2002-04-04T00:00:00Z/2017-10-25T00:00:00Z -90 -180 90 180 Google Earth Engine https://developers.google.com/earth-engine/datasets - [https://doi.org/10.1175/2010JTECHO738.1](https://doi.org/https://grace.jpl.nasa.gov/data/get-data/monthly-mass-grids-ocean/) - [https://doi.org/10.1175/2010JTECHO738.1](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_GRACE_MASS_GRIDS_V04_OCEAN)