![projects/openet/assets/disalexi/conus/gridmet/monthly/v2_0](https://developers.google.com/earth-engine/datasets/images/OpenET/projects_openet_assets_disalexi_conus_gridmet_monthly_v2_0_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 : 2001-01-01T00:00:00Z--2025-01-01T00:00:00Z 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) [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 Atmosphere-Land Exchange Inverse / Disaggregation of the Atmosphere-Land Exchange Inverse (ALEXI/DisALEXI). DisALEXI was ported to Google Earth Engine as part of the OpenET framework. The baseline ALEXI/DisALEXI model structure is described by Anderson et al. (2012, 2018). The ALEXI evapotranspiration (ET) model specifically uses time differential land surface temperature (LST) measurements from geostationary or moderate resolution polar orbiting platforms to generate regional ET maps. DisALEXI then disaggregates the regional ALEXI ET to finer scales using Landsat data (30 m; biweekly) to resolve individual farm fields and other landscape features. > [!NOTE] > **Note:** DisALEXI data does not exist before 2001 since the source ALEXI data is only available starting in 2001. [Additional information](https://etdata.org/methods/) ### Bands **Bands** Pixel size: 30 meters (all bands) | Name | Units | Pixel Size | Description | |---|---|---|---| | `et` | mm | 30 meters | Total actual evapotranspiration (ET) | | `count` | count | 30 meters | Number of cloud free observations in the month included in the interpolation | ### Image Properties **Image Properties** | Name | Type | Description | |---|---|---| | build_date | STRING | Date assets were built | | cloud_cover_max | DOUBLE | Maximum CLOUD_COVER_LAND percent value for Landsat images included in interpolation | | collections | STRING | List of Landsat collections for Landsat images included in the interpolation | | core_version | STRING | OpenET core library version | | end_date | STRING | End date of month | | et_reference_band | STRING | Band in et_reference_source that contains the daily reference ET data | | et_reference_resample | STRING | Spatial interpolation mode to resample daily reference ET data | | et_reference_source | STRING | Collection ID for the daily reference ET data | | interp_days | DOUBLE | Maximum number of days before and after each image date to include in interpolation | | interp_method | STRING | Method used to interpolate between Landsat model estimates | | interp_source_count | DOUBLE | Number of available images in the interpolation source image collection for the target month | | mgrs_tile | STRING | MGRS grid zone ID | | model_name | STRING | OpenET model name | | model_version | STRING | OpenET model version | | scale_factor_count | DOUBLE | Scaling factor that should be applied to the count band | | scale_factor_et | DOUBLE | Scaling factor that should be applied to the et band | | 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: - Anderson, M., Gao, F., Knipper, K., Hain, C., Dulaney, W., Baldocchi, D ., Eichelmann, E., Hemes, K., Yang, Y., Medellin-Azuara, J. and Kustas, W., 2018. Field-scale assessment of land and water use change over the California Delta using remote sensing. Remote Sensing, 10(6), p.889. [doi:10.3390/rs10060889](https://doi.org/10.3390/rs10060889) - Anderson, M.C., Norman, J.M., Mecikalski, J.R., Otkin, J.A. and Kustas, W.P., 2007. A climatological study of evapotranspiration and moisture stress across the continental United States based on thermal remote sensing: 1. Model formulation. Journal of Geophysical Research: Atmospheres, 112(D10). [doi:10.1029/2006JD007506](https://doi.org/10.1029/2006JD007506) ### 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/disalexi/conus/gridmet/monthly/v2_0') .filterDate('2020-01-01', '2021-01-01'); // Compute the annual evapotranspiration (ET) as the sum of the monthly ET // images for the year. var et = dataset.select('et').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 DisALEXI Annual ET'); ``` [Open in Code Editor](https://code.earthengine.google.com/?scriptPath=Examples:Datasets/OpenET/projects_openet_assets_disalexi_conus_gridmet_monthly_v2_0) [OpenET DisALEXI Monthly Evapotranspiration v2.0](https://developers.google.com/earth-engine/datasets/catalog/projects_openet_assets_disalexi_conus_gridmet_monthly_v2_0) Atmosphere-Land Exchange Inverse / Disaggregation of the Atmosphere-Land Exchange Inverse (ALEXI/DisALEXI). DisALEXI was ported to Google Earth Engine as part of the OpenET framework. The baseline ALEXI/DisALEXI model structure is described by Anderson et al. (2012, 2018). The ALEXI evapotranspiration (ET) model specifically uses time differential land surface temperature (LST) ... projects/openet/assets/disalexi/conus/gridmet/monthly/v2_0, evapotranspiration,landsat-derived,monthly,openet,publisher-dataset,water,water-vapor 2001-01-01T00:00:00Z/2025-01-01T00:00:00Z 25 -126 50 -86 Google Earth Engine https://developers.google.com/earth-engine/datasets - [https://doi.org/10.3390/rs10060889](https://doi.org/https://etdata.org/) - [https://doi.org/10.3390/rs10060889](https://doi.org/https://developers.google.com/earth-engine/datasets/catalog/projects_openet_assets_disalexi_conus_gridmet_monthly_v2_0)