CIMIS Spatial ETo maps

The dataset contains daily grass-reference evapotranspiration (ETo) maps stored as ASCII files. ETo at a 2 km spatial resolution are calculated statewide using the American Society of Civil Engineers version of the Penman-Monteith equation (ASCE-PM). Required input parameters for the ASCE-PM ETo equation are solar radiation, air temperature, relative humidity, and wind speed at two meters height. These parameters are estimated for each 2 km pixel using various methods.

Daily solar radiation is generated from the visible band of the National Oceanic and Atmospheric Administration's (NOAA) Geostationary Operational Environmental Satellite (GOES) using the Heliosat-II model. This model is designed to convert images acquired by the Meteosat satellite into maps of global (direct plus diffused) irradiation received at ground level.

Data and Resources

Field Value
accessLevel public
catalog_@context https://project-open-data.cio.gov/v1.1/schema/catalog.jsonld
catalog_conformsTo https://project-open-data.cio.gov/v1.1/schema
catalog_describedBy https://project-open-data.cio.gov/v1.1/schema/catalog.json
identifier 1224fa61-f763-49b3-b496-c51583cb4bf8
issued 2018-06-18T18:19:17.515855
modified 2018-07-02T21:20:10.299619
publisher California Department of Water Resources
resource-type Dataset
source_datajson_identifier true
source_hash 4da2c9a864a55eac031acc25cfc3df5a8491d61a
source_schema_version 1.1
theme {"Natural Resources",Water}
Groups
  • AmeriGEOSS
  • National Provider
  • North America
Tags
  • amerigeo
  • amerigeoss
  • california-department-of-water-resources
  • cimis-spatial-eto
  • ckan
  • eto
  • evapotranspiration
  • geo
  • geoss
  • national
  • north-america
  • reference-et
  • united-states
isopen False
license_id notspecified
license_title License not specified
maintainer DWR CIMIS Public Contact
maintainer_email DWRCIMISPublicContact@water.ca.gov
metadata_created 2025-11-21T16:56:57.546229
metadata_modified 2025-11-21T16:56:57.546232
notes The dataset contains daily grass-reference evapotranspiration (ETo) maps stored as ASCII files. ETo at a 2 km spatial resolution are calculated statewide using the American Society of Civil Engineers version of the Penman-Monteith equation (ASCE-PM). Required input parameters for the ASCE-PM ETo equation are solar radiation, air temperature, relative humidity, and wind speed at two meters height. These parameters are estimated for each 2 km pixel using various methods. Daily solar radiation is generated from the visible band of the National Oceanic and Atmospheric Administration's (NOAA) Geostationary Operational Environmental Satellite (GOES) using the Heliosat-II model. This model is designed to convert images acquired by the Meteosat satellite into maps of global (direct plus diffused) irradiation received at ground level.
num_resources 1
num_tags 13
title CIMIS Spatial ETo maps