Iowa Agriculture & Food Security

Land surface temperature (LST) derived from September 2018 Landsat 8 TIRS data, processed with bands 4,5, and 10. This image was taken over southeastern Iowa around the Des Moines River. The darkest red values indicate higher temperatures around 40˚C while the darkest blue values indicate the lower temperatures around 24 ˚C. Higher temperatures indicate greater amounts of plant stress.

Assessing Drought-Induced Vegetation Stress and its Impact on Crop Production Across Iowa

Iowa dedicates 92% of its land to agriculture, leaving the state economically and culturally vulnerable to drought. Current climate trends show increasing temperatures and decreasing precipitation levels, which are environmental factors that put stress on vegetation and force farmers to rely on dwindling aquifers for crop irrigation. It is difficult to identify droughts until plants show signs of stress, by which time the chance of recovery drops drastically. The Iowa Climatology Bureau (ICB) in the Iowa Department of Agriculture and Land Stewardship (IDALS) is responsible for identifying areas experiencing drought and alerting decision makers of emergency situations. The team used remote sensing data from the International Space Station (ISS) ECOsystem Spaceborne Thermal Radiometer Experiment on the Space Station (ECOSTRESS) Evaporative Stress Index (ESI), Suomi National Polar-orbiting Partnership (NPP) Visible Infrared Imaging Radiometer Suite (VIIRS), and Landsat 8 Thermal Infrared Sensor (TIRS) to determine the feasibility of detecting droughts sooner. A statewide drought analysis was conducted using the Atmosphere-Land Exchange Inverse (ALEXI) Evaporative Stress Index (ESI). The team compared their new techniques with existing methodologies to determine if NASA Earth observations can enhance the partner’s current drought analysis procedures. The team determined that the higher temporal and spatial resolution of ESI products provide finer details of drought conditions. The ICB will be able to use these tools to supplement its current drought-tracking methods.

Project Video:

Take a Rain Check

Alabama — Marshall
Spring 2019
Iowa Department of Agriculture and Land Stewardship, Climatology Bureau
NASA Earth Observations
Landsat 8 TIRS
Brittany Greene (Project Lead)
Audrieauna Beatty
Abigail Whiteside
Dr. Jeffrey Luvall (NASA Marshall Space Flight Center)
Dr. Robert Griffin (University of Alabama in Huntsville)
Helen Baldwin (University of Alabama in Huntsville)
Maggi Klug (University of Alabama in Huntsville)
Leigh Sinclair (University of Alabama in Huntsville, Information Technology & Systems Center)