The Mendenhall Program offers a range of two-year post-doctoral research fellowships within the U.S. Geological Survey. Heather Tollerud took advantage of the program in 2015 to study drought and land cover at the USGS EROS Center, and has since become a key player in the Center’s innovative Land Change Monitoring, Assessment and Projection (LCMAP) initiative.
Audio
Explore the USGS collection of audio includes podcasts, interviews, and sounds.
The Mendenhall Program offers a range of two-year post-doctoral research fellowships within the U.S. Geological Survey. Heather Tollerud took advantage of the program in 2015 to study drought and land cover at the USGS EROS Center, and has since become a key player in the Center’s innovative Land Change Monitoring, Assessment and Projection (LCMAP) initiative.
In the West African nation of Ghana, tropical forests are more than landscape. They are woven into language, custom, and culture. They are also the source of timber for home heating and industry, as well as barriers to agricultural production. Those are just a few of the reasons why deforestation has come alongside the nation’s rapid population growth.
In the West African nation of Ghana, tropical forests are more than landscape. They are woven into language, custom, and culture. They are also the source of timber for home heating and industry, as well as barriers to agricultural production. Those are just a few of the reasons why deforestation has come alongside the nation’s rapid population growth.
The Arctic is changing at a more rapid rate than the rest of the planet. Some of the most significant changes are tied to the thawing of near-surface permafrost, the layers of frozen soil containing vast stocks of stored carbon.
The Arctic is changing at a more rapid rate than the rest of the planet. Some of the most significant changes are tied to the thawing of near-surface permafrost, the layers of frozen soil containing vast stocks of stored carbon.
For decades, each Landsat image had a price tag – a hefty one at times, ranging from $400 to as much as $4,000. That all changed in 2008 with the enactment of an open data policy that made the entire Landsat archive available for download at no cost to the user.
For decades, each Landsat image had a price tag – a hefty one at times, ranging from $400 to as much as $4,000. That all changed in 2008 with the enactment of an open data policy that made the entire Landsat archive available for download at no cost to the user.
Across the planet, in rural settings on uncluttered landscapes, there are satellite antennas receiving data directly from Landsat satellites as they pass 438 miles overhead at more than 17,000 miles per hour. It happens multiple times a day, in Australia, Brazil, Canada, Germany, South Korea, and elsewhere.
Across the planet, in rural settings on uncluttered landscapes, there are satellite antennas receiving data directly from Landsat satellites as they pass 438 miles overhead at more than 17,000 miles per hour. It happens multiple times a day, in Australia, Brazil, Canada, Germany, South Korea, and elsewhere.
It’s easy enough to measure rainfall, and nearly as easy to measure streamflow. Calculating the efficiency of water use through the metric of evapotranspiration (ET) – evaporation off the Earth’s surface and transpiration from the leaves of plants – is a far trickier proposal.
It’s easy enough to measure rainfall, and nearly as easy to measure streamflow. Calculating the efficiency of water use through the metric of evapotranspiration (ET) – evaporation off the Earth’s surface and transpiration from the leaves of plants – is a far trickier proposal.
Land cover and land use across the United States are the culmination of a complex web of interwoven factors: Climate, landscape types, and economic factors among them. Remotely-sensed data from satellites like Landsat and a variety of other sources are useful for documenting and monitoring land cover and land use.
Land cover and land use across the United States are the culmination of a complex web of interwoven factors: Climate, landscape types, and economic factors among them. Remotely-sensed data from satellites like Landsat and a variety of other sources are useful for documenting and monitoring land cover and land use.
Scientists at EROS have spent years refining their approach to mapping burn severity using remotely-sensed data from satellites like Landsat, but Landsat comes with limitations. Landsat data cannot see the vegetation below a thick tree canopy, for example.
Scientists at EROS have spent years refining their approach to mapping burn severity using remotely-sensed data from satellites like Landsat, but Landsat comes with limitations. Landsat data cannot see the vegetation below a thick tree canopy, for example.
Sixty years of manned and unmanned space flight have left a cosmic junkyard circling the planet. In 2017, the U.S. government reported that it logged 308,984 close calls with space junk and issued 655 emergency-reportable alerts to satellite operators.
Sixty years of manned and unmanned space flight have left a cosmic junkyard circling the planet. In 2017, the U.S. government reported that it logged 308,984 close calls with space junk and issued 655 emergency-reportable alerts to satellite operators.
Summary: Scientists at EROS use tools like Landsat to produce land cover maps, which tell us if landscapes are rural or urban, cropped or forested, wetland or shrubland. Those maps help scientists at EROS and around the U.S. study the impact of changes in land use on not just landscapes, but on ecosystems, patterns of resource use, wildlife habitat, and much more.
Summary: Scientists at EROS use tools like Landsat to produce land cover maps, which tell us if landscapes are rural or urban, cropped or forested, wetland or shrubland. Those maps help scientists at EROS and around the U.S. study the impact of changes in land use on not just landscapes, but on ecosystems, patterns of resource use, wildlife habitat, and much more.
A farmer at the foot of a corn stalk can tell how well the plant is faring. That same farmer might survey his entire field for crop health. But assessing the health of crops or forests at regional, national, and international scales requires remote sensing, most often via satellite.
A farmer at the foot of a corn stalk can tell how well the plant is faring. That same farmer might survey his entire field for crop health. But assessing the health of crops or forests at regional, national, and international scales requires remote sensing, most often via satellite.
Each fall, EROS invites its staff scientists and area graduate students to visit for a noontime poster session. The poster sessions offer a change for those researchers to present their results to their peers and get feedback from their fellow scientists.
Each fall, EROS invites its staff scientists and area graduate students to visit for a noontime poster session. The poster sessions offer a change for those researchers to present their results to their peers and get feedback from their fellow scientists.
We tend to associate Landsat satellites with what we see on solid Earth, but they can also tell us much about the health of our inland and coastal ecosystems. Landsat can be used to monitor harmful algal blooms, for example. Eyes on Earth guest Dr.
We tend to associate Landsat satellites with what we see on solid Earth, but they can also tell us much about the health of our inland and coastal ecosystems. Landsat can be used to monitor harmful algal blooms, for example. Eyes on Earth guest Dr.
Nearly 85 million people around the world are currently considered “food insecure,” and that figure continues to grow. Remote sensing technology enables scientists to feed data into the Famine Early Warning Systems Network (FEWS NET), which in turn can issue alerts that guide the distribution of humanitarian aid.
Nearly 85 million people around the world are currently considered “food insecure,” and that figure continues to grow. Remote sensing technology enables scientists to feed data into the Famine Early Warning Systems Network (FEWS NET), which in turn can issue alerts that guide the distribution of humanitarian aid.
Every year, the USDA’s National Agricultural Statistics Service (NASS) uses data from satellites like Landsat to estimate crop types and crop yields in the United States. The result is the Cropland Data Layer (CDL), which offers an annual look at more than 100 crop categories across the country.
Every year, the USDA’s National Agricultural Statistics Service (NASS) uses data from satellites like Landsat to estimate crop types and crop yields in the United States. The result is the Cropland Data Layer (CDL), which offers an annual look at more than 100 crop categories across the country.
EROS scientists track water availability and crop health around the world to help governments and non-profits manage resources and stave off food shortages. But EROS also teaches international scientists to track those resources themselves. In this episode, we hear about a recent training session at EROS for Iraq’s Ministry of Water Resources.
EROS scientists track water availability and crop health around the world to help governments and non-profits manage resources and stave off food shortages. But EROS also teaches international scientists to track those resources themselves. In this episode, we hear about a recent training session at EROS for Iraq’s Ministry of Water Resources.
How much does an Earth observation satellite weigh? How are they launched? How fast does it travel? Does Landsat have a gas tank? In this episode of Eyes on Earth, we answer some of the basic questions surrounding the satellites that define the EROS mission.
How much does an Earth observation satellite weigh? How are they launched? How fast does it travel? Does Landsat have a gas tank? In this episode of Eyes on Earth, we answer some of the basic questions surrounding the satellites that define the EROS mission.
There’s a lot more than Landsat in the EROS Archive. In this episode of Eyes on Earth, we hear from a professor who’s mined satellite data collected during once-classified military missions to peer into the history of land use in Eastern Europe during the height of the Cold War.
There’s a lot more than Landsat in the EROS Archive. In this episode of Eyes on Earth, we hear from a professor who’s mined satellite data collected during once-classified military missions to peer into the history of land use in Eastern Europe during the height of the Cold War.
The USGS Ecosystems Mission Area brings you Outstanding in the Field, a series of stories about our science, our adventures, and our efforts to better understand our fish and wildlife and the ecosystems that support them. In this episode we describe some of the one-of-a-kind native fish species that call the Grand Canyon segment of the Colorado River home.
The USGS Ecosystems Mission Area brings you Outstanding in the Field, a series of stories about our science, our adventures, and our efforts to better understand our fish and wildlife and the ecosystems that support them. In this episode we describe some of the one-of-a-kind native fish species that call the Grand Canyon segment of the Colorado River home.
Earth observation used to be the province of a handful of countries with satellite technology. Today, hundreds of satellites built all over the world are launched every year. This episode of Eyes on Earth talks about the explosive growth in the civilian and commercial remote sensing and EROS’ role in it.
Earth observation used to be the province of a handful of countries with satellite technology. Today, hundreds of satellites built all over the world are launched every year. This episode of Eyes on Earth talks about the explosive growth in the civilian and commercial remote sensing and EROS’ role in it.
Sorting Landsat data into an accurate and reliable record of land cover in the United States is one of the most important jobs at EROS. This episode of Eyes on Earth explores the what, how, and why of the National Land Cover Database (NLCD).
Sorting Landsat data into an accurate and reliable record of land cover in the United States is one of the most important jobs at EROS. This episode of Eyes on Earth explores the what, how, and why of the National Land Cover Database (NLCD).