{"action":"update","ckan_id":"9324eba2-9271-440e-9082-2e9208393769","date_created":"Tue, 27 Jan 2026 19:20:39 GMT","date_finished":null,"harvest_job_id":"00981211-2f33-44d0-bfa0-5a56d65ae018","harvest_source_id":"959a1dad-e8ac-4235-935b-b5ca593f6714","id":"622c4628-b8eb-4711-bece-f763a7f719f2","identifier":"f2796747-a9c3-4880-993e-1dc507ad04ab","parent_identifier":null,"source_hash":"50e9353760cda5c28ef5888fdd1db8829fccb77c2ae5c134eec6ad36e289e92d","source_raw":"{\"@type\": \"dcat:Dataset\", \"accessLevel\": \"public\", \"contactPoint\": {\"@type\": \"vcard:Contact\", \"fn\": \"DWR CIMIS Public Contact\", \"hasEmail\": \"mailto:DWRCIMISPublicContact@water.ca.gov\"}, \"description\": \"\\ud83d\\udd14 **Data now available in Cloud-Optimized GeoTIFF format for faster access!**\\r\\n\\r\\n### Summary\\r\\nThis dataset contains daily grass-reference evapotranspiration (ETo) maps for California at 2 km spatial resolution. The ETo values are expressed in millimeters (mm) per day.  Spatial data are provided in EPSG:3310 (NAD83 / California Albers) with units in meters.\\r\\n\\r\\nETo values are calculated statewide using the ASCE-Penman-Monteith equation (ASCE-PM), with required input parameters including solar radiation, air temperature, relative humidity, and wind speed at two meters height.\\r\\nDaily solar radiation is derived from NOAA GOES satellite imagery using the Heliosat-II model, which converts visible-band satellite images into global horizontal irradiation at ground level. Air temperature, relative humidity, and wind speed are interpolated across the 2 km grid from CIMIS weather station measurements using Spline interpolation. This hybrid method allows spatially distributed ETo maps statewide, filling gaps where station coverage is sparse. Refer to https://cimis.water.ca.gov/SpatialData.aspx and the \\u201cDaily reference evapotranspiration for California using satellite imagery and weather station measurement interpolation\\u201d (Civil Engineering and Environmental Systems, October 2007) for detailed methodology.\\r\\n\\r\\n###Update (Dec 2025)\\r\\nDataset name updated to \\u201cSpatial CIMIS ETo maps \\u2014 Daily Reference Evapotranspiration for California.\\r\\nAdded Cloud-Optimized GeoTIFF (COG) format for annual datasets (2004\\u2013present) to improve accessibility and enable efficient streaming. Original  links to ASCII files remain available.\\r\\n\\r\\n###Formats Available\\r\\nThe dataset is provided in two formats to allows users to choose the format best suited for their analysis and workflows.\\r\\n\\r\\n1.\\tOriginal ASCII files \\u2014 organized in a year/month/day folder structure.\\r\\n2.\\tCloud-Optimized GeoTIFF (COG) files \\u2014 one per year, enabling efficient streaming and subset access without downloading entire files. Each COG contains daily ETo values in a 2\\u00d72 km grid, covering 2004 through the most recently available year.\\r\\n\\r\\n###Temporal Coverage\\r\\nData are available annually from 2004 through the most recent year in both ASCII and Cloud-Optimized GeoTIFF (COG) formats. Note that the current year\\u2019s dataset may have a lag of several months before all daily values are finalized and published. Prior to 2004, data are available only in ASCII format for 2003 (February through December) and for October 2000.\\r\\n\\r\\n###Access Via API\\r\\nFor data via a web Application Programming Interface (API) please refer to https://data.cnra.ca.gov/dataset/cimis-weather-station-spatial-cimis-data-web-api\\r\\n\\r\\n###Suggested Citation \\r\\nCalifornia Irrigation Management Information System. (n.d.). CIMIS spatial ETo maps: Daily reference evapotranspiration for California. California Department of Water Resources. Retrieved Month Day, Year, from  https://data.cnra.ca.gov/dataset/cimis-spatial-eto-maps\\r\\n\\r\\n###Related dataset\\r\\n[CIMIS Weather Station Data](https://data.cnra.ca.gov/dataset/cimis-weather-station-data)\\r\\n\\r\\n###Change Log\\r\\nDec 2025: Added COG format and updated dataset name. Updated metadata and clarified description.\", \"distribution\": [{\"@type\": \"dcat:Distribution\", \"description\": \"The ETo maps are presented as compressed ASCII files (ETo.asc.gz). The ETo maps are contained in folders defined by Year, Month, and Day. ETo data is expressed in millimeters.The ASCIII files can be converted to conventional raster formats (TIF, img) using commercial and open source software. The spatial reference of the maps are defined as EPSG Projection 3310 - NAD83 / California Albers (http://spatialreference.org/ref/epsg/3310/).  .\", \"downloadURL\": \"https://spatialcimis.water.ca.gov/cimis/\", \"format\": \"ASCII\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo maps\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2004.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/f0915a01-b0ed-4012-ad41-320347ff2519/download/eto_20040101-20041231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2004 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2005.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/9c9b38b3-69a9-4cbb-8447-6e17d9601458/download/eto_20050101-20051231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2005 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2006.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/1afa2b31-312f-4e46-964a-81a77e3b6ac7/download/eto_20060101-20061231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2006 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2007.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/9e4e0f2d-9dda-4313-bb9d-3cbd113a9b06/download/eto_20070101-20071231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2007 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2008.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/c9919bff-b58e-4c8e-9e9a-987b5758e062/download/eto_20080101-20081231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2008 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2009.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/6c8a8900-31a0-4075-b3b6-af1c53b841b8/download/eto_20090101-20091231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2009 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2010.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/1cbf0976-4083-44c8-996d-a5d894ffb66e/download/eto_20100101-20101231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2010 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2011.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/0b46c52d-99a0-4a82-a852-dc63e211e597/download/eto_20110101-20111231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2011 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2012.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/37ce8216-0acb-4b97-8d22-65e3641b3cb9/download/eto_20120101-20121231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2012 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2013.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/70e2bd0a-ec15-4ece-a789-d735adc1f01b/download/eto_20130101-20131231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2013 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2014.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/5cd58054-2bb2-4249-b1ab-df5c3f639c9e/download/eto_20140101-20141231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2014 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2015.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/be9c4b51-f1a1-47e2-9eca-1db0065285cd/download/eto_20150101-20151231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2015 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2016.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/13e13509-d8f4-4568-a240-6d21c9626fa7/download/eto_20160101-20161231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2016 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2017.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/4ec80f07-c142-4c0c-8b10-8dad035ca6c9/download/eto_20170101-20171231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2017 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2018.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/ccc3e5bb-968a-42e2-858a-afc1681a9523/download/eto_20180101-20181231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2018 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2019.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/2b15fbc9-0035-4aa4-b94f-5724d9c21f8d/download/eto_20190101-20191231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2019 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2020.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/1d8b7fbe-3f22-4205-9704-afe7cfc0d9c7/download/eto_20200101-20201231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2020 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2021.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/32cc648a-3181-48f3-b0e4-5a5bba513824/download/eto_20210101-20211231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2021 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2022.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/2c7889c2-a4f7-4637-baf2-2e9d6a943b19/download/eto_20220101-20221231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2022 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2023.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/f0c5c009-05b1-46a7-95ae-b899cc8a3457/download/eto_20230101-20231231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2023 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2024.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/a433a11d-1db6-4843-aa67-f88782516fba/download/eto_20240101-20241231_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2024 (v1)\"}, {\"@type\": \"dcat:Distribution\", \"description\": \"This resource provides annual Reference Evapotranspiration (ETo) data for California for the year 2025.\\nThe dataset is referenced in EPSG:3310 \\u2014 NAD83 / California Albers.\\nData type: Daily composite values.\", \"downloadURL\": \"https://data.cnra.ca.gov/dataset/74b3a94a-f044-4e9c-9cd2-ca6f5b7d9be1/resource/891fd61e-ed49-427c-80f9-4c6d1ead2056/download/eto_20250101-20250731_v1.tif\", \"format\": \"geotiff\", \"mediaType\": \"application/octet-stream\", \"title\": \"Spatial CIMIS ETo Map \\u2014 Daily Reference ETo for California, 2025 (v1)\"}], \"identifier\": \"f2796747-a9c3-4880-993e-1dc507ad04ab\", \"issued\": \"2018-06-18T18:19:17.515855\", \"keyword\": [\"CIMIS\", \"ETo\", \"agriculture\", \"california\", \"california department of water resources\", \"evapotranspiration\", \"reference ET\", \"spatial ETo\", \"water management\"], \"license\": \"Other (Public Domain)\", \"modified\": \"2026-01-13T21:18:28.855975\", \"publisher\": {\"@type\": \"org:Organization\", \"name\": \"California Department of Water Resources\"}, \"theme\": [\"Natural Resources\", \"Water\"], \"title\": \"Spatial CIMIS ETo maps \\u2014 Daily Reference Evapotranspiration for California\"}","source_transform":null,"status":"error"}