NASA 制作的 GRACE 任务的所有数据均免费提供给公众使用。使用任何 GRCTellus 数据时，请添加致谢声明：“GRACE 陆地数据可从 https://grace.jpl.nasa.gov 获取，由 NASA MEaSUREs 计划提供支持。”并使用提供的引用信息进行引用。
引用
引用：
Felix Landerer。2021 年。TELLUS_GRAC_L3_JPL_RL06_LND_v04. 版本 RL06 v04。
PO.DAAC，美国加利福尼亚州。数据集访问日期 [YYYY-MM-DD]，网址为 https://doi.org/10.5067/TELND-3AJ64。
Landerer F.W. 和 S. C. Swenson，“Accuracy of scaled GRACE terrestrial water storage estimates”，Water Resources Research，第 48 卷，W04531，11 页，doi:10.1029/2011WR011453，2012 年。
Swenson, S. C. 和 J. Wahr，GRACE 数据中相关误差的后处理移除，地球物理学研究快报，2007 年。Res. Lett.，33, L08402,
doi:10.1029/2005GL025285, 2006.
[null,null,[],[[["\u003cp\u003eThe NASA/GRACE/MASS_GRIDS_V04/LAND dataset provides monthly terrestrial water storage anomalies derived from GRACE and GRACE-FO gravity observations from April 2002 to January 2017.\u003c/p\u003e\n"],["\u003cp\u003eData is provided as equivalent water thickness in centimeters, representing changes in soil moisture, snow, surface water, and groundwater.\u003c/p\u003e\n"],["\u003cp\u003eThe dataset includes data processed by three centers (CSR, GFZ, JPL) and includes uncertainty estimates for each.\u003c/p\u003e\n"],["\u003cp\u003eGlacial isostatic adjustment and other corrections have been applied to the data to enhance accuracy.\u003c/p\u003e\n"],["\u003cp\u003eUsers are encouraged to cite the provided references and acknowledge the NASA MEaSUREs Program when using this data.\u003c/p\u003e\n"]]],["The dataset, provided by NASA's Jet Propulsion Laboratory, offers monthly land mass grids from April 2002 to January 2017. It contains water mass anomalies as equivalent water thickness, reflecting terrestrial water storage variations, including soil moisture and groundwater. Data is derived from GRACE/GRACE-FO gravity observations, processed with corrections for geocenter, C20, C30, and glacial isostatic adjustment. Three centers produce the data: CSR, GFZ, and JPL, with slight variations.\n"],null,["# GRACE Monthly Mass Grids Release 06 Version 04 - Land\n\nDataset Availability\n: 2002-04-01T00:00:00Z--2017-01-07T00:00:00Z\n\nDataset Provider\n:\n\n\n [NASA Jet Propulsion Laboratory](https://grace.jpl.nasa.gov/data/get-data/monthly-mass-grids-land/)\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) [land](/earth-engine/datasets/tags/land) [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\nThe monthly land mass grids contain water mass anomalies given as equivalent\nwater thickness derived from GRACE \\& GRACE-FO time-variable gravity\nobservations during the specified timespan, and relative to the specified\ntime-mean reference period. The equivalent water thickness represents the\ntotal terrestrial water storage anomalies from soil moisture, snow, surface\nwater (incl. rivers, lakes, reservoirs etc.), as well as groundwater and\naquifers. A glacial isostatic adjustment (GIA) correction has been applied,\nand standard corrections for geocenter (degree-1), C20 (degree-20) and\nC30 (degree-30) are incorporated. Post-processing filters have been applied\nto reduce correlated errors. Version 04 (v04) of the terrestrial water\nstorage data uses updated and consistent C20 and Geocenter corrections\n(i.e., Technical Notes TN-14 and TN-13), as well as an ellipsoidal\ncorrection to account for the non-spherical shape of the Earth when mapping\ngravity anomalies to surface mass change.\n\nThe GRACE Tellus (GRCTellus) Monthly Mass Grids dataset is produced\nby three centers: CSR (U. Texas / Center for Space Research),\nGFZ (GeoForschungsZentrum Potsdam), and JPL\n(NASA Jet Propulsion Laboratory). Each center is a part\nof the GRACE Ground System and generates Level-2 data\n(spherical harmonic fields) used in this dataset.\nThe output includes spherical harmonic coefficients\nof the gravity field and of the dealiasing fields used to compute them.\nSince each center independently produces the coefficients, the results\nmay be slightly different. It is recommended for most users to\nuse the mean of all three datasets. See the provider's [choosing a\nsolution](https://grace.jpl.nasa.gov/data/choosing-a-solution/) page\nfor more details.\n\n### Bands\n\n\n**Pixel Size**\n\n111320 meters\n\n**Bands**\n\n| Name | Units | Pixel Size | Description |\n|---------------------|-------|------------|---------------------------------------------------------------------|\n| `lwe_thickness_csr` | cm | meters | Equivalent liquid water thickness in centimeters calculated by CSR. |\n| `lwe_thickness_gfz` | cm | meters | Equivalent liquid water thickness in centimeters calculated by GFZ. |\n| `lwe_thickness_jpl` | cm | meters | Equivalent liquid water thickness in centimeters calculated by JPL. |\n| `uncertainty_csr` | | meters | Error estimation by CSR. |\n| `uncertainty_gfz` | | meters | Error estimation by GFZ. |\n| `uncertainty_jpl` | | meters | Error estimation by JPL. |\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- Felix Landerer. 2021. TELLUS_GRAC_L3_JPL_RL06_LND_v04. Ver. RL06 v04.\n PO.DAAC, CA, USA. Dataset accessed \\[YYYY-MM-DD\\] at\n \u003chttps://doi.org/10.5067/TELND-3AJ64\u003e.\n- Landerer F.W. and S. C. Swenson, Accuracy of scaled GRACE terrestrial\n water storage estimates. Water Resources Research, Vol 48, W04531, 11 PP,\n [doi:10.1029/2011WR011453](https://doi.org/10.1029/2011WR011453), 2012.\n- Swenson, S. C. and J. Wahr, Post-processing removal of correlated\n errors in GRACE data, Geophys. Res. Lett., 33, L08402,\n [doi:10.1029/2005GL025285](https://doi.org/10.1029/2005GL025285), 2006.\n\n### DOIs\n\n- \u003chttps://doi.org/10.1029/2005GL025285\u003e\n- \u003chttps://doi.org/10.1029/2011WR011453\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.Image('NASA/GRACE/MASS_GRIDS_V04/LAND/20170501_20170522');\nvar lwe_thickness = dataset.select('lwe_thickness_csr');\nvar palette = ['001137', '01abab', 'e7eb05', '620500'];\nvar equivalentWaterThicknessCsrVis = {\n palette: palette,\n min: -0.7845402964290882,\n max: 0.5693220260300134\n};\nMap.setCenter(6.746, 46.529, 2);\nMap.addLayer(\n lwe_thickness, 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_V04_LAND) \n[GRACE Monthly Mass Grids Release 06 Version 04 - Land](/earth-engine/datasets/catalog/NASA_GRACE_MASS_GRIDS_V04_LAND) \nThe monthly land mass grids contain water mass anomalies given as equivalent water thickness derived from GRACE \\& GRACE-FO time-variable gravity observations during the specified timespan, and relative to the specified time-mean reference period. The equivalent water thickness represents the total terrestrial water storage anomalies from soil moisture, snow, surface ... \nNASA/GRACE/MASS_GRIDS_V04/LAND, crs,gfz,grace,gravity,jpl,land,mass,nasa,surface-ground-water,tellus,water \n2002-04-01T00:00:00Z/2017-01-07T00:00:00Z \n-90 -180 90 180 \nGoogle Earth Engine \nhttps://developers.google.com/earth-engine/datasets\n\n- [https://doi.org/10.1029/2011WR011453](https://doi.org/https://grace.jpl.nasa.gov/data/get-data/monthly-mass-grids-land/)\n- [https://doi.org/10.1029/2011WR011453](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/NASA_GRACE_MASS_GRIDS_V04_LAND)"]]
