A New Tool For Mapping Water Use, Drought

USDA ALEXI Drought Tool

Growers and water managers may soon have an online tool to help them assess drought and irrigation impacts on water use and crop development, thanks to the work of two USDA scientists.

Agricultural Research Service (ARS) scientists Martha Anderson and Bill Kustas have developed an evapotranspiration (ET) and drought modeling system at the ARS Hydrology and Remote Sensing Laboratory in Beltsville, MD. The modeling system also will help forecasters monitor ET and drought conditions across the U.S. and overseas.

The model, known as ALEXI (Atmosphere-Land Exchange Inverse), uses thermal infrared imagery from satellites and calculates soil and plant temperatures that can be used to create maps of ET rates of plants growing in cultivated areas, forests and natural habitats around the world. 

ET consists of the water evaporated from soil and plant surfaces, and the water vapor that escapes, or transpires, through plant leaf pores (stomata) as the plants absorb carbon dioxide through photosynthesis. Generally, evaporation cools surfaces, so a cooler land surface is an indicator of higher ET rates and wetter soils. 

Water stress elevates soil and leaf temperatures, which can be detected by satellites. Anderson and Kustas can use satellite temperature data to create ET maps. The maps are capable of detecting rivers, lakes, wetlands, riparian buffers, irrigated cropland and areas under water stress.

To read the full article, click here.  

Read more about this research in the February 2012 issue of Agricultural Research magazine.

Leave a Reply

Featured Stories

CitrusFlorida Citrus Growers Get Box Tax Relief
October 23, 2014
Citrus Commission votes to put dollars back in producers’ hands to spur reinvestment. Read More
Farm ManagementBill Gates Uploading Lots Of Florida Farmland
October 22, 2014
Recent acquisition for the Microsoft icon involves more than 4,500 acres for nearly $28 million. Read More
GenNext GrowersRegister Now For The GenNext Growers Webcast
October 22, 2014
In the first installment of the GenNext Webcast Series, you will learn how to engage with lawmakers and ag associations to help shape a better future for your business and for agriculture. Read More
FruitsAnnual Santa Maria Strawberry Meeting Approaching
October 22, 2014
The meeting will focus on IPM practices, weed management, updates on fumigation, and more. Read More
Apples & PearsUSApple’s AppletizeMe Personality Quiz Help Consumers Find Ideal Apple Varieties and Perfect Food Pairings
October 22, 2014
Award-winning national apple month campaign returns with more featured varieties and informative videos. Read More
Farm ManagementUSDA Awards $18 Million To Stimulate Research And Development Innovation
October 22, 2014
The grants will provide resources to help small operations create breakthroughs, says USDA Secretary Tom Vilsack. Read More
CitrusEPA Launches Program To Reduce Pesticide Drift
October 22, 2014
The voluntary star-rating program aims to protect people, wildlife and the environment. Read More
CitrusMcCrometer Introduces New Ag Management Mobile App
October 22, 2014
The app displays data on weather, ET, soil moisture, water flow, and more. Read More
Apples & PearsNew York Apple Growers Partner With Grocer To Introduce SnapDragon Apples
October 22, 2014
First apples of this new variety to hit Wegmans stores as part of a marketing effort. Read More
CitrusAgriculture, Interior Departments Partner To Measure Conservation Impacts On Water Quality
October 22, 2014
Goal is to provide science-based information for watershed wellness. Read More

The Latest

CitrusFlorida Citrus Growers Get Box Tax Relief
October 23, 2014
Citrus Commission votes to put dollars back in producers’ hands to spur reinvestment. Read More
Farm ManagementBill Gates Uploading Lots Of Florida Farmland
October 22, 2014
Recent acquisition for the Microsoft icon involves more than 4,500 acres for nearly $28 million. Read More
GenNext GrowersRegister Now For The GenNext Growers Webcast
October 22, 2014
In the first installment of the GenNext Webcast Series, you will learn how to engage with lawmakers and ag associations to help shape a better future for your business and for agriculture. Read More
FruitsAnnual Santa Maria Strawberry Meeting Approaching
October 22, 2014
The meeting will focus on IPM practices, weed management, updates on fumigation, and more. Read More
Apples & PearsUSApple’s AppletizeMe Personality Quiz Help Consumers…
October 22, 2014
Award-winning national apple month campaign returns with more featured varieties and informative videos. Read More
Farm ManagementUSDA Awards $18 Million To Stimulate Research And Devel…
October 22, 2014
The grants will provide resources to help small operations create breakthroughs, says USDA Secretary Tom Vilsack. Read More
CitrusEPA Launches Program To Reduce Pesticide Drift
October 22, 2014
The voluntary star-rating program aims to protect people, wildlife and the environment. Read More
CitrusMcCrometer Introduces New Ag Management Mobile App
October 22, 2014
The app displays data on weather, ET, soil moisture, water flow, and more. Read More
Apples & PearsNew York Apple Growers Partner With Grocer To Introduce…
October 22, 2014
First apples of this new variety to hit Wegmans stores as part of a marketing effort. Read More
CitrusAgriculture, Interior Departments Partner To Measure Co…
October 22, 2014
Goal is to provide science-based information for watershed wellness. Read More
Stone FruitIntroducing A Gem Of A Peach For Central Florida
October 22, 2014
The newest variety to come from the UF Stone Fruit Breeding Program is another “gem,” UFGem! This peach variety is Read More
CitrusIt’s Time For Young Farming Leaders To Engage [Op…
October 21, 2014
Florida Grower editor Frank Giles says there are capable and talented youths in the ag field ready to step up and take the reins. Read More
Farm ManagementResearchers Finding Biofuel Fits For Florida
October 21, 2014
Alternative crops identified that are suited for the state's climate and can easily be processed for power. Read More
CitrusBayer CropScience Launches New Award To Recognize Produ…
October 21, 2014
Award recognizes innovation that enhances the role of produce in creating better lives. Read More
FruitsCalifornia Department Of Food And Agriculture Awards $3…
October 21, 2014
State Water Efficiency And Enhancement Program highlights projects implement irrigation systems that reduce water and energy use. Read More
FruitsWashington State University Researchers See How Plants …
October 21, 2014
Results could lead to development of crops that recover from sun damage more easily. Read More
CitrusReport: Major Food And Agriculture Employers Can’t Fi…
October 21, 2014
Current shortage of young farming professionals means ample employment opportunity for the next generation. Read More
Apples & PearsInvasive Pest Found First Time In U.S. At Border Crossi…
October 20, 2014
Moth known to feed on apples, apple buds, leaves, and shoots, is found in a container full of pump valves originating in China. Read More