Global production and free access to Landsat-scale Evapotranspiration with EEFlux and eeMETRIC

Authors

Ayse Kilic, University of Nebraska-LincolnFollow
R G. Allen, University of IdahoFollow
Philip A. Blankenau, University of Nebraska-LincolnFollow
Peter Revelle, University of Idaho
Doruk Ozturk, University 0f Nebraska-LincolnFollow
Justin L. Huntington, Western Regional Climate Center & Desert Research InstituteFollow

Date of this Version

2020

Citation

An ASABE Meeting Presentation DOI: https://doi.org/10.13031/irrig.2020-038 Paper Number: 20-038

6th Decennial National Irrigation Symposium Sponsored by ASABE San Antonio, Texas November 30 – December 4, 2020

Abstract

EEFlux (Earth Engine Evapotranspiration Flux) is a version of the METRIC (mapping evapotranspiration at high resolution with internal calibration) application that operates on the Google Earth Engine (EE). EEFlux has a web-based interface and provides free public access to transform Landsat images into 30 m spatial evapotranspiration (ET) data for terrestrial land areas around the globe. EE holds the entire Landsat archive to power EEFlux along with NLDAS/CFSV2 gridded weather data for estimating reference ET. EEFlux is a part of the upcoming OpenET platform (https://openetdata.org/ ) that has leveraged nonprofit funding to provide ET information to all of the lower 48 states for free, as a means to foster water exchange between agriculture, cities and environment (Melton et al., 2020). The METRIC version in OpenET is named eeMETRIC, and includes cloud detection and time integration of ET snapshots into monthly ET estimates. EEFlux and eeMETRIC employ METRIC’s “mountain” algorithms for estimating aerodynamics and solar radiation in complex terrain. Calibration is automated and ET images are computed for download in seconds using EE’s large computational capacity.