- Dataset Availability
- 2002-03-31T00:00:00Z–2017-05-22T00:00:00Z
- Dataset Provider
- NASA Jet Propulsion Laboratory
- Earth Engine Snippet
-
ee.ImageCollection("NASA/GRACE/MASS_GRIDS/MASCON_CRI")
- Tags
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 for more details.
The GRACE Tellus (GRCTellus) Global Mascon dataset is based on Level-1 GRACE observations and processed at NASA Jet Propulsion Laboratory (JPL).
This dataset uses a-priori constraints in space and time to estimate global, monthly gravity fields in terms of equal-area 3°x3° spherical cap mass concentration (mascon) functions to minimize the effect of measurement errors. This results in better S/N ratios of the mascon fields compared to the conventional spherical-harmonic solutions.
This version of the Global Mascon dataset has a Coastline Resolution Improvement (CRI) filter applied to separate the land and ocean portions of mass within each land/ocean mascon in a post-processing step. For users who wish to do their own separation of land and ocean mass signals, a version of the data without the CRI filter is available at NASA/GRACE/MASS_GRIDS/MASCON.
Note
A set of global gain factors to aid in the interpretation of signals at sub-mascon resolution is available at NASA/GRACE/MASS_GRIDS/MASCON_SCALE_CRI_2015. Please note: the gain factors can be used for hydrology-related signals, but not for mountain glaciers or ice sheets. For more information on scaling the mascon solutions, please see Wiese et al. (2016).
The data are represented on a 1/2 degree lon-lat grid, but they represent the 3x3 degree equal-area caps, which is the current native resolution of JPL-RL05M.
Bands
Resolution
55660 meters
Bands
| Name | Units | Min | Max | Description |
|---|---|---|---|---|
lwe_thickness |
cm | -570.65* | 495.53* | Equivalent liquid water thickness in centimeters. |
uncertainty |
0.29* | 31.1* | 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 |
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 https://grace.jpl.nasa.gov, supported by the NASA MEaSUREs Program." and cite with the citations provided.
Citations
D.N. Wiese. 2015. GRACE monthly global water mass grids NETCDF RELEASE 5.0. Ver. 5.0. PO.DAAC, CA, USA.. Dataset accessed [YYYY-MM-DD] at https://doi.org/10.5067/TEMSC-OCL05.
Watkins, M. M., D. N. Wiese, D.-N. Yuan, C. Boening, and 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, and 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.
DOIs
Explore with Earth Engine
Code Editor (JavaScript)
var dataset = ee.ImageCollection('NASA/GRACE/MASS_GRIDS/MASCON_CRI') .filter(ee.Filter.date('2016-08-01', '2016-08-30')); var equivalentWaterThickness = dataset.select('lwe_thickness'); var equivalentWaterThicknessVis = { min: -25.0, max: 25.0, }; Map.setCenter(6.746, 46.529, 2); Map.addLayer( equivalentWaterThickness, equivalentWaterThicknessVis, 'Equivalent Water Thickness');