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Contact

Mailing Address:
3806 N 3600 E
Kimberly ID 83341-5082

Phone: 208-423-4691

Fax: 208-423-6699

Web: uidaho.edu/cals/kimberly

Directions

Mailing Address:
315 Falls Avenue East
Twin Falls ID 83301

Phone: 208-736-3600

Fax: 208-736-0843

Web: uidaho.edu/cals/twin-falls

Physical Address:
E.J. Iddings Agricultural Science Laboratory, Room 45
606 Rayburn Street

Mailing Address:
875 Perimeter Drive MS 2337
Moscow, ID 83844-2337

Phone: 208-885-6681

Fax: 208-885-6654

Web: uidaho.edu/cals/iaes

Directions

Remote Sensing of Evapotranspiration

The generation of evapotranspiration maps using Landsat Satellite images is based on METRIC (Mapping EvapoTranspiration at high Resolution and Internalized Calibration). This process was initially funded in the early 2000s by the Idaho Department of Water Resources (IDWR). Since then, evapotranspiration maps for eastern southern Idaho have been generated for 1986, 1996, 2000, 2006, 2008, 2009, 2010, 2011, 2013, 2016 and 2017. We are currently preparing to perform "Near Real Time" METRIC processing for 2018. The images/maps are available on line from the IDWR ET GIS website. Additionally, we are working on generation of METRIC evapotranspiration maps for the Treasure Valley area (Boise to Fruitland) for select years to support IDWR and USGS Treasure Valley aquifer modeling project. The process has also been applied at various locations throughout the United States and the world.

In 2009, the Idaho Department of Water Resources — University of Idaho partnership that applies METRIC-based ET in IDWR hydrology and water rights and operations was awarded the prestigious Innovations in American Government Award by the Ash Institute of the Kennedy School of American Governance of Harvard University. The award announcement is at: "Mapping Evapotranspiration from Satellites."

Animations of ET in Idaho are available at: "Evapotranspiration from Landsat" which was produced by the NASA Goddard Space Flight Center.

A two-page Landsat specifications description  sponsored by the Western States Water Council that advocates for a four-day Landsat revisit time is available at "Essential Specifications for Landsat -- WSWC April 9 2012.pdf." A four-day revisit time can be accomplished by having four currently-designed Landsats in orbit at the same time, or by launching new Landsat satellites that have twice the path width as the current design. In 2017, the Landsat Science Team formulated future requirements for the Landsat program. Seventeen of twenty-one members polled recommended a one day revisit time (https://landsat.usgs.gov/sites/default/files/documents/landsat_science_team/2017-07_Day1_Crawford_Landsat_10_and_beyond.pdf.)  A one day Landsat revisit time would nearly guarantee the ability to consistently produce evapotranspiration images for the entire continental U.S.. Most of the continental U.S. requires 16 satellites for a clear image every 16 days 70 percent of the time. This power point shows the impact of the number of satellites and probability of cloud free images to produce cloud-free ET images at least once per 16 days or once per 32 days for the continental U.S. An additional analysis for southern Idaho based on actual Landsat image collections over the past forty years summarizes the impacts of clouds on one versus two satellites for southern Idaho annual ET (pdf)

Contact

Mailing Address:
3806 N 3600 E
Kimberly ID 83341-5082

Phone: 208-423-4691

Fax: 208-423-6699

Web: uidaho.edu/cals/kimberly

Directions

Mailing Address:
315 Falls Avenue East
Twin Falls ID 83301

Phone: 208-736-3600

Fax: 208-736-0843

Web: uidaho.edu/cals/twin-falls

Physical Address:
E.J. Iddings Agricultural Science Laboratory, Room 45
606 Rayburn Street

Mailing Address:
875 Perimeter Drive MS 2337
Moscow, ID 83844-2337

Phone: 208-885-6681

Fax: 208-885-6654

Web: uidaho.edu/cals/iaes

Directions