Podcast Overview

Guests: Savannah Cooley, Applied Science Systems Engineer, NASA Jet Propulsion Laboratory

Host: John Hult

Producer: John Hult

Release date: May 2, 2022

Summary: Some plants are simply better at making use of their water supply than others. More efficient plants can capture more carbon with less water, which has implications for carbon sequestration and ultimately for climate change modeling. In other words, the more we understand about water use efficiency, the more reliable our climate change models can be. And the only way to measure efficiency at the global scale is from space. On this episode of Eyes on Earth, we hear from a scientist who studied global water use using a sensor called ECOSTRESS, whose data are housed at the USGS EROS Center, in NASA’s Land Processes Distributed Active Archive Center (LP DAAC).

More on ECOSTRESS and Global Water Use:

• Convergence in water use efficiency within plant functional types across contrasting climates
• Eyes on Earth Episode 65 – Rapid Fire Mapping with Remote Sensing
• Eyes on Earth Episode 63 - ECOSTRESS and Post-Fire Recovery
• Eyes on Earth Episode 70 - ECOSTRESS and Aquatic Ecosystems

Guests: Rebecca Gustine, NASA Jet Propulsion Laboratory (JPL), Cassandra Nickles, NASA JPL, Shruti Khanna, California Department of Water Resources

Host: John Hult

Producer: John Hult

Release date: March 21, 2022

Summary: The Earth observation data archived here have plenty of value to the study of aquatic ecosystems. Landsat satellites can capture harmful algal blooms, for example. Spaceborne sensors can also record land surface temperatures, and that includes water surfaces. On this episode of Eyes on Earth, we hear about how a sensor called ECOSTRESS can be used to measure water temperatures at different times of day, and how those measurements could be useful in the monitoring and management of the endangered Delta smelt. ECOSTRESS data are available through the NASA Land Processes Distributed Active Archive Center (LP DAAC), located in the USGS EROS Center.

More on aquatic ecosystems and ECOSTRESS :

• Using ECOSTRESS to Observe and Model Diurnal Variability in Water Temperature Conditions in the San Francisco Estuary
• Eyes on Earth Episode 67 – ECOSTRESS and Water Use
• Eyes on Earth Episode 65 – Rapid Fire Mapping with Remote Sensing

Guest: Dr. Kerry Cawse-Nicholson, deputy science lead for ECOSTRESS at NASA Jet Propulsion Laboratory

Host: John Hult

Producer: John Hult

Release date: February 7, 2022

Summary: If you want to know how much rain fell yesterday, you can catch it and measure it. Water vapor? That's not so easy. Which is a problem if you want to know how quickly that rate is returning to the atmosphere. Water vapor is the single largest part of the water budget, but without space-based observations, it would be all but impossible to measure at wide scale. On this episode of Eyes on Earth, we learn how a sensor called ECOSTRESS helps improve the space-based measurement of evapotranspiration, or ET, which is the combined rate of evaporation from the Earth's surface and transpiration from plants.

More on ECOSTRESS and ET:

• Kerry Cawse-Nicholson staff bio – NASA JPL
• Interoperability of ECOSTRESS and Landsat for mapping evapotranspiration time series at sub-field scales
• Eyes on Earth Episode 65 – Rapid Fire Mapping with Remote Sensing
• Eyes on Earth Episode 63 - ECOSTRESS and Post-Fire Recovery

Guests: Andre Coleman, senior research scientist, Pacific Northwest National Laboratory (PNNL), Lee Miller, remote sensing specialist, PNNL, Rick Stratton, USDA Forest Service

Host: John Hult

Producer: John Hult

Release date: January 10, 2022

Summary: Satellites like Landsat are valuable for mapping fire perimeters and for monitoring trends in burn severity or in post-fire recovery. Satellites can cover wide areas with a single pass, whereas helicopter, drone, or airplane fire line mapping can take hours. But civilian satellites with moderate resolution typically don't get imagery for the entire planet every day, and every day counts when large fires rage. On this episode of Eyes on Earth, we talk through a tool called RADR-Fire built to pull data from a wide variety of sources to map disaster impacts on a day-by-day basis. ECOSTRESS, a sensor on the International Space Station whose data are archived at the NASA’s EROS-based Land Processes Distributed Active Archive Center (LP DAAC), has been an especially useful source of information. 

More on ECOSTRESS and RADR-Fire:

• Rapid Analytics for Disaster Response (RADR-Fire)
• ECOSTRESS
• Land Processes Distributed Active Archive Center (LP DAAC)

Guest: Dr. Helen Poulos, forest ecologist, Wesleyan University

Host: John Hult

Producer: John Hult

Release date: December 13, 2021

Summary: Fires can be destructive or healthy for a landscape—often both. Fires have grown larger and more destructive in recent years, though, thanks to human activity, climate change, and a host of other factors. Satellite data helps us to map and monitor fire activity, but the study of post-fire plant life using remote sensing data goes further than fire mapping. On this episode of Eyes on Earth, we hear from Dr. Helen Poulos, who used data from the ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station, (ECOSTRESS), to study Arizona Pine Oak forest 5-7 years after severe fire. Dr. Poulos and her collaborators at Northern Arizona University and the University of Maine at Farmington learned that post-fire shrublands had surprisingly high rates of water use. ECOSTRESS data are available through NASA’s Land Processes Distributed Active Archive Center or LP DAAC, which is located at EROS.

More on ECOSTRESS:

• Helen Poulos biography
• ECOSTRESS
• USGS, EROS Process ‘First Light’ Images from Landsat 9
• Wildfire severity and vegetation recovery drive post-fire evapotranspiration in a southwestern pine-oak forest, Arizona, USA
  

Guest: Dr. Jeffrey Masek, NASA Landsat Project Scientist, Dr. Brian Freitag, NASA Research Physical Scientist

Host: John Hult

Producer: John Hult

Release date: March 8, 2021

Summary: Landsat satellites have monitored the Earth’s surface for nearly 50 years, providing critical information for countless areas of study and real world applications. But with observations only collected every 8-16 days, there are limits to what can be tracked. On today’s episode of Eyes on Earth, we hear about a soon-to-be-released data product that merges Landsat with data from the European Space Agency’s Sentinel-2 satellites, which will offer more opportunities to monitor rapid change. The harmonized Landsat-Sentinel data will be available through the Land Processes Distributed Active Archive Center (LP DAAC), located at the USGS Earth Resources Observation and Science (EROS) Center.

More on the Harmonized Landsat Sentinel Data: 

• Harmonized Landsat-Sentinel 2 (HLS) Overview
• Getting Started with Cloud-Native HLS Data in Python
• HLS Python SuPER Script
• Land Processes Distributed Active Archive Center

Guests: Stephen Boyte, USGS EROS research physical scientist, Devendra Dahal, USGS EROS contractor, Matt Reeves, USDA Forest Service ecologist

Host: John Hult

Producer: John Hult

Release date: January 24, 2022

Summary: The rangelands of the western United States are changing more quickly than many other parts of the lower 48. Miles upon miles of the area or semi-arid landscapes in states like Idaho, Montana and Nevada are now carpeted by fire fueling invasive grasses. Cheatgrass is the most prevalent, which is troublesome for several reasons. First off, it greens up and browns down really quickly, leaving a layer of tinder-like vegetation. In many areas, it fills in the formerly barren spaces between thicker bunchgrasses and sagebrush, which in turn helps fires move rapidly from fuel source to fuel source. On this episode of Eyes on Earth, we hear from the USGS EROS teams who use satellite data to map exotic annual grasses and a researcher who uses those maps to create monthly grass abundance estimates for firefighters and land managers.

More on Exotic Annual Grasses:

• Fractional Estimates of Multiple Exotic Annual Grass (EAG) Species and Sandberg bluegrass in the Sagebrush Biome, USA, 2016 – 2020
• Fuelcast
• New USGS EROS Maps to Offer Aid in Understanding, Management of Invasive Grasses
• USGS EROS Work Informs USGS Sagebrush Ecosystem Efforts

Guest: Dr. Eric Bullock, U.S. Forest Service

Host: John Hult

Producer: John Hult

Release date: March 22, 2021






Summary: Deforestation is a significant concern for many parts of the globe, particularly in places like the rainforests of the Amazon or the Congo. Scientists, governments, and non-governmental organizations turn to satellite data to track deforestation, as well as to set targets for improvement. On this episode of Eyes on Earth, we hear from a remote sensing specialist with the U.S. Forest Service who develops algorithms that sift through satellite data to capture not only deforestation events, but the more subtle degradation events that have an impact on forest health.

More on Deforestation and Forest Degradation: 

• Satellite‐based estimates reveal widespread forest degradation in the Amazon
• NASA Earthdata User Profile: Dr. Eric Bullock
• United Nations Collaborative Programme on Reducing Emissions from Deforestation and Forest Degradation in Developing Countries (REDD+)
• Land Processes Distributed Active Archive Center (LP DAAC)
• Eyes on Earth Episode 45 – Harmonized Landsat Sentinel Data