![projects/openet/assets/ensemble/conus/gridmet/monthly/v2_1](https://developers.google.com/earth-engine/datasets/images/OpenET/projects_openet_assets_ensemble_conus_gridmet_monthly_v2_1_sample.png) info This dataset is part of a Publisher Catalog, and not managed by Google Earth Engine. Contact [support@openetdata.org](https://etdata.org/contact-us/) for bugs or [view more datasets](https://developers.google.com/earth-engine/datasets/publisher/openet) from the OpenET Catalog. [Learn more about Publisher datasets](https://developers.google.com/earth-engine/datasets/publisher). [![Catalog Owner Logo](https://developers.google.com/static/earth-engine/datasets/logos/openet_logo.png)](https://etdata.org) Catalog Owner : OpenET Dataset Availability : 2015-10-01T00:00:00Z--2026-10-01T00:00:00Z Dataset Producer : [OpenET, Inc.](https://etdata.org/) Contact : [support@openetdata.org](https://etdata.org/contact-us/) Cadence : 1 Month Tags : [evapotranspiration](https://developers.google.com/earth-engine/datasets/tags/evapotranspiration) [gridmet-derived](https://developers.google.com/earth-engine/datasets/tags/gridmet-derived) [landsat-derived](https://developers.google.com/earth-engine/datasets/tags/landsat-derived) [monthly](https://developers.google.com/earth-engine/datasets/tags/monthly) [openet](https://developers.google.com/earth-engine/datasets/tags/openet) [publisher-dataset](https://developers.google.com/earth-engine/datasets/tags/publisher-dataset) [water](https://developers.google.com/earth-engine/datasets/tags/water) [water-vapor](https://developers.google.com/earth-engine/datasets/tags/water-vapor) #### Description The OpenET dataset includes satellite-based data on the total amount of water that is transferred from the land surface to the atmosphere through the process of evapotranspiration (ET). OpenET provides ET data from multiple satellite-driven models, and also calculates a single "ensemble value" from the model ensemble. The models currently included in the OpenET model ensemble are ALEXI/DisALEXI, eeMETRIC, geeSEBAL, PT-JPL, SIMS, and SSEBop. The OpenET ensemble ET value is calculated as the mean of the ensemble after filtering and removing outliers using the median absolute deviation approach. All models currently use Landsat satellite data to produce ET data at a pixel size of 30 meters by 30 meters (0.22 acres per pixel). The monthly ET dataset provides data on total ET by month as an equivalent depth of water in millimeters. **OpenET Collection v2.1** OpenET Collection v2.1 is a reprocessed and updated version of Collection v2.0, designed primarily to address known v2.0 issues, while also incorporating minor model improvements and input-data updates. It is expected that there will be noticeable differences in ET between the two collection versions for some places and times. Some of the updates and changes include: - Additional cloud screening and filtering to skip Landsat images with unmasked clouds and/or extensive snow cover. - Reprocessing to incorporate updates to the NLDAS-2 and GRIDMET input meteorology datasets. - Incorporation of the USGS Annual NLCD product for all models that require land cover information. - Incorporation of the latest USDA CDL for all models that require crop type information. - Updates to the interpolation so monthly ET is only produced when all days in the month have interpolated values (reducing "count=0" months in cloudy/snowy or low-coverage periods). - Application of an emissivity correction to address a known issue in Landsat LST data. [Additional information](https://etdata.org/methods/) ### Bands **Bands** Pixel size: 30 meters (all bands) | Name | Units | Pixel Size | Description | |---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---| | `et_ensemble_mad` | mm | 30 meters | Ensemble ET value, computed as the mean of the ensemble after filtering outliers using the median absolute deviation (mad) | | `et_ensemble_mad_min` | mm | 30 meters | The minimum value in the ensemble range, after filtering for outliers using the median absolute deviation (mad) | | `et_ensemble_mad_max` | mm | 30 meters | The maximum value in the ensemble range, after filtering for outliers using the median absolute deviation (mad) | | `et_ensemble_mad_count` | | 30 meters | The number of models used to compute the ensemble ET value, after filtering for outliers using the median absolute deviation (mad) | | `et_ensemble_mad_index` | | 30 meters | Bitmask indicating which models were included in the ensemble ET value, after filtering for outliers using the median absolute deviation (mad) | | Bitmask for et_ensemble_mad_index - Bit 0: DisALEXI included in ensemble - 0: No - 1: Yes - Bit 1: EEMETRIC included in ensemble - 0: No - 1: Yes - Bit 2: GEESEBAL included in ensemble - 0: No - 1: Yes - Bit 3: PTJPL included in ensemble - 0: No - 1: Yes - Bit 4: SIMS included in ensemble - 0: No - 1: Yes - Bit 5: SSEBop included in ensemble - 0: No - 1: Yes |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||| | `et_ensemble_sam` | mm | 30 meters | The simple arithmetic mean (sam) of all six models in the OpenETmodel ensemble | ### Image Properties **Image Properties** | Name | Type | Description | |---|---|---| | build_date | STRING | Date assets were built | | core_version | STRING | OpenET core library version | | end_date | STRING | End date of month | | mgrs_tile | STRING | MGRS grid zone ID | | start_date | STRING | Start date of month | ### Terms of Use **Terms of Use** [CC-BY-4.0](https://spdx.org/licenses/CC-BY-4.0.html) ### Citations Citations: - Melton, F., Huntington, J., Grimm, R., Herring, J., Hall, M., Rollison, D., Erickson, T., Allen, R., Anderson, M., Fisher, J., Kilic, A., Senay, G., volk, J., Hain, C., Johnson, L., Ruhoff, A., Blankenau, P., Bromley, M., Carrara, W., Daudert, B., Doherty, C., Dunkerly, C., Friedrichs, M., Guzman, A., Halverson, G., Hansen, J., Harding, J., Kang, Y., Ketchum, D., Minor, B., Morton, C., Revelle, P., Ortega-Salazar, S., Ott, T., Ozdogon, M., Schull, M., Wang, T., Yang, Y., Anderson, R., 2021. OpenET: Filling a Critical Data Gap in Water Management for the Western United States. Journal of the American Water Resources Association, 2021 Nov 2. [doi:10.1111/1752-1688.12956](https://doi.org/10.1111/1752-1688.12956) ### 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.ImageCollection('projects/openet/assets/ensemble/conus/gridmet/monthly/v2_1') .filterDate('2024-01-01', '2025-01-01'); // Compute the annual evapotranspiration (ET) as the sum of the monthly ET // images for the year. var et = dataset.select('et_ensemble_mad').sum(); var visualization = { min: 0, max: 1400, palette: [ '9e6212', 'ac7d1d', 'ba9829', 'c8b434', 'd6cf40', 'bed44b', '9fcb51', '80c256', '61b95c', '42b062', '45b677', '49bc8d', '4dc2a2', '51c8b8', '55cece', '4db4ba', '459aa7', '3d8094', '356681', '2d4c6e', ] }; Map.setCenter(-100, 38, 5); Map.addLayer(et, visualization, 'OpenET Ensemble Annual ET'); ``` [Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/OpenET/projects_openet_assets_ensemble_conus_gridmet_monthly_v2_1) [OpenET Ensemble Monthly Evapotranspiration v2.1](https://developers.google.com/earth-engine/datasets/catalog/projects_openet_assets_ensemble_conus_gridmet_monthly_v2_1) The OpenET dataset includes satellite-based data on the total amount of water that is transferred from the land surface to the atmosphere through the process of evapotranspiration (ET). OpenET provides ET data from multiple satellite-driven models, and also calculates a single "ensemble value" from the model ensemble. The models currently ... projects/openet/assets/ensemble/conus/gridmet/monthly/v2_1, evapotranspiration,gridmet-derived,landsat-derived,monthly,openet,publisher-dataset,water,water-vapor 2015-10-01T00:00:00Z/2026-10-01T00:00:00Z 25 -126 50 -66 Google Earth Engine https://developers.google.com/earth-engine/datasets - [https://doi.org/10.1111/1752-1688.12956](https://doi.org/https://etdata.org/) - [https://doi.org/10.1111/1752-1688.12956](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/projects_openet_assets_ensemble_conus_gridmet_monthly_v2_1)