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By NASA
6 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Dwane Roth (right), a fourth generation grain farmer in Finney County, Kansas, stands with nephew Zion (left) in one of their corn fields. Roth’s farm became one of the first Water Technology Farms in Kansas around 2016, and he has been using OpenET data for the past few years to track evapotranspiration rates and conserve water. Photo courtesy of Dwane Roth A NASA and U.S. Geological Survey (USGS)-supported research and development team is making it easier for farmers and ranchers to manage their water resources.
The team, called OpenET, created the Farm and Ranch Management Support (FARMS) tool, which puts timely, high-resolution water data directly in the hands of individuals and small farm operators. By making the information more accessible, the platform can better support decision-making around agricultural planning, water conservation, and water efficiency. The OpenET team hopes this will help farmers who are working to build greater resiliency in local and regional agriculture communities. build greater resiliency in local and regional agriculture communities.
“It’s all about finding new ways to make satellite data easier to access and use for as many people as possible,” said Forrest Melton, the OpenET project scientist at NASA’s Ames Research Center in Silicon Valley. “The goal is to empower users with actionable, science-based data to support decisions about water management across the West.”
The goal is to empower users with actionable, science-based data to support decisions about water management across the West.
Forrest melton
OpenET Project Scientist
OpenET Data Explorer Tool: The Road to FARMS
The OpenET data explorer tool centers on providing evapotranspiration data. Evapotranspiration (ET) refers to the amount of water leaving Earth’s surface and returning to the atmosphere through evaporation (from soil and surface water) and transpiration (water vapor released by crops and other plants). Evapotranspiration is an important factor in agriculture, water resource management, irrigation planning, drought monitoring, and fire risk evaluation.
The FARMS resource is the third phase of OpenET’s Data Explorer tool, launched in 2021, which uses satellite data to quantify evapotranspiration across the western U.S.
It starts with using Landsat data to measure patterns in land surface temperature and key indicators of vegetation conditions. The satellite data is combined with agricultural data, such as field boundaries, and weather data, such as air temperature, humidity, solar radiation, wind speed, and precipitation. All of these factors feed into a model, which calculates the final evapotranspiration data.
The new FARMS interface was designed to make that data easier to access, with features that meet specific needs identified by users.
“This amount of data can be complicated to use, so user input helped us shape FARMS,” said Jordan Harding, app developer and interface design leader from HabitatSeven. “It provides a mobile-friendly, map-based web interface designed to make it easy as possible to get automated, regular reports.”
Top: A section of the 2024 annual report Roth submits to the Farm Service Agency, with hand-written annotations marking which crop will be grown that year. Bottom: Those same fields in the new OpenET FARMS interface, with a dashboard on the left displaying evapotranspiration data over the course of 2024 at monthly intervals. Each color line corresponds to the same color field on the map, showcasing how much evapotranspiration rates can differ between different crops in the same vicinity. The unique shape of the purple field (forage sorghum), is an example of a case where FARMS’ custom shape feature is helpful. Once the initial report is set up, Roth can re-run reports for the same fields at any time. NASA/OpenET “The FARMS tool is designed to help farmers optimize irrigation timing and amounts, simplify planning for the upcoming irrigation season, and automate ET and water use reporting,” said Sara Larsen, CEO of OpenET. “All of this reduces waste, lowers costs, and informs crop planning.”
Although FARMS is geared towards agriculture, the tool has value for other audiences in the western U.S. Land managers who evaluate the impacts of wildfire can use it to evaluate burn scars and changes to local hydrology. Similarly, resource managers can track evapotranspiration changes over time to evaluate the effectiveness of different forest management plans.
New Features in FARMS
To develop FARMS, the OpenET team held listening sessions with farmers, ranchers, and resource managers. One requested function was support for field-to-field comparisons; a feature for planning irrigation needs and identifying problem areas, like where pests or weeds may be impacting crop yields.
The tool includes numerous options for drawing or selecting field boundaries, generating custom reports based on selected models and variables, and automatically re-running reports at daily or monthly intervals.
The fine spatial resolution and long OpenET data record behind FARMS make these features more effective. Many existing global ET data products have a pixel size of over half a mile, which is too big to be practical for most farmers and ranchers. The FARMS interface provides insights at the scale of a quarter-acre per pixel, which offers multiple data points within an individual field.
“If I had told my father about this 15 years ago, he would have called me crazy,” said Dwane Roth, a fourth-generation farmer in Kansas. “Thanks to OpenET, I can now monitor water loss from my crops in real-time. By combining it with data from our soil moisture probes, this tool is enabling us to produce more food with less water. It’s revolutionizing agriculture.”
The FARMS mobile interface displays a six-year evapotranspiration report of a pear orchard owned by sixth-generation California farmer Brett Baker. The purple line in the dashboard report (left) corresponds with the field selected in purple on the map view (right), which users can toggle between using the green buttons in the top right corners. Running multi-year reports allows farmers to review historical trends.NASA/OpenET For those like sixth-generation California pear farmer Brett Baker, the 25-year span of ET data is part of what makes the tool so valuable. “My family has been farming the same crop on the same piece of ground for over 150 years,” Baker said. “Using FARMS gives us the ability to review historical trends and changes to understand what worked and what didn’t year to year: maybe I need to apply more fertilizer to that field, or better weed control to another. Farmers know their land, and FARMS provides a new tool that will allow us to make better use of land and resources.”
According to Roth, the best feature of the tool is intangible. “Being a farmer is stressful,” Roth said. “OpenET is beneficial for the farm and the agronomic decisions, but I think the best thing it gives me is peace of mind.”
Being a farmer is stressful. OpenET is beneficial for the farm and the agronomic decisions, but I think the best thing it gives me is peace of mind.
Dwane Roth
Fourth-Generation Kansas Grain Farmer
Continuing Evolution of FARMS
Over the coming months, the OpenET team plans to present the new tool at agricultural conferences and conventions in order to gather feedback from as many users as possible. “We know that there is already a demand for a seven-day forecast of ET, and I’m sure there will be requests about the interface itself,” said OpenET senior software engineer Will Carrara. “We’re definitely looking to the community to help us further refine that platform.”
“I think there are many applications we haven’t even thought of yet,” Baker added. “The FARMS interface isn’t just a tool; it’s an entirely new toolbox itself. I’m excited to see what people do with it.”
FARMS was developed through a public-private collaboration led by NASA, USGS, USDA, the non-profit OpenET, Inc., Desert Research Institute, Environmental Defense Fund, Google Earth Engine, HabitatSeven, California State University Monterey Bay, Chapman University, Cornell University, University of Nebraska-Lincoln, UC Berkeley and other universities, with input from more than 100 stakeholders.
To use FARMS, please visit: https://farms.etdata.org/
For additional resources/tutorials on how to use FARMS, please visit: https://openet.gitbook.io/docs/additional-resources/farms
About the Author
Milan Loiacono
Science Communication SpecialistMilan Loiacono is a science communication specialist for the Earth Science Division at NASA Ames Research Center.
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Last Updated Mar 04, 2025 Related Terms
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By NASA
4 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
Artist concept highlighting the novel approach proposed by the 2025 NIAC awarded selection of SUPREME-QG: Space-borne Ultra-Precise Measurement of the Equivalence Principle Signature of Quantum GravityNASA/Selim Shahriar Selim Shahriar
Northwestern University, Evanston
Progress in physics has largely been driven by the development and verification of new theories that unify different fundamental forces of nature. For example, Maxwell revolutionized physics with his unified theory of electricity and magnetism, and the Standard Model of particle physics provides a consistent description of all fundamental forces (electromagnetic, strong, and weak) except for gravity. The major barrier to completing the quest for unification is that General Relativity (GR), the current theory of gravity, cannot be reconciled with QM. Theories of Quantum Gravity (TQG), which are yet untested, prescribe modifications of both GR and QM in a manner that makes them consistent with each other. Tests of TQG represent arguably the greatest challenge facing our understanding of the Universe. The most promising way to test TQG is to search for violation of the Equivalence Principle (EP), a fundamental tenet of GR which states that all objects experience the same acceleration in a gravitational field. Violation of EP is characterized by a nonzero Eotvos parameter, Eta, defined as the ratio of the relative acceleration to the mean acceleration experienced by two objects with different inertial masses in a gravitational field. EP violations at the level of Eta < 10^(-18) arise in many versions of TQG (e.g., string theory). The most precise test of the EP to date has been carried out under the space-borne MICROSCOPE experiment employing classical accelerometers, constraining the value of Eta to <1.5×10^(-15). We propose to investigate the use of a radically new method that leverages quantum entanglement to test the EP with extreme precision, at the level of Eta ~ 10^(-20), using a space-borne platform. This method is described in a recent paper by us (PRD 108, 024011, ’23). It makes use of simultaneous Schroedinger Cat (SC) state atom interferometers (AIs) with two isotopes of Rb. Consisting of N=10^6 atoms, the SC state, which is a maximally entangled quantum state generated via spin-squeezing of cold atoms in an optical cavity, acts as a single particle, in a superposition of two collective states, enhancing the sensitivity by a factor of ~root(N)=10^3. Such large-N SC states are difficult to create and have not been observed yet, let alone leveraged for precision metrology. In another recent paper, we described a novel protocol, namely the generalized echo squeezing protocol (GESP), to overcome the challenges of creating such a state (PRA 107, 032610, ’23). We will demonstrate the functionality of this method in a testbed to enable a follow-on space-borne mission capable of testing the EP at the level of Eta ~ 10^(-20). If EP violation is observed, the version of TQG that agrees most closely with the result would form the foundation for a complete theory governing the universe, including its birth: the Big Bang. A null result would force physicists to conceive an entirely new approach to addressing the irreconcilability of GR and QM, fundamentally altering the course of theoretical physics. Either outcome would represent one of the greatest developments in our quest for understanding nature. The SC-state AI (SCAI), also holds the promise of revolutionary improvements in the precision of gravitational cartography and inertial navigation, when configured for simultaneous accelerometry and rotation sensing. The sensitivity of such a sensor, for one second averaging time, would be ~0.9 femto-g for accelerometry, and ~0.5 pico-degree/hour for rotation sensing. This would represent an improvement by a factor of ~10^5 over the best conventional accelerometer, and a factor of ~10^4 over the best conventional gyroscopes. As such, the SCAI would find widespread usage in defense as well as non-defense sectors, including deep-space exploration, for inertial navigation. A space-borne SCAI would be able to carry out gravitational cartography with a resolution far greater than that achieved using the GRACE-FO satellites.
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By NASA
2 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
NASA Deputy Administrator Pam Melroy and Deputy Associate Administrator Casey Swails visit the American Airlines Integrated Operations Center near Dallas Fort Worth International Airport on a recent trip to see NASA’s digital tools for aviation efficiency in operational use.American Airlines It’s the holiday season — which means many are taking to the skies to join their loved ones.
If you’ve ever used an app to navigate on a road trip, you’ve probably noticed how it finds you the most efficient route to your destination, even before you depart. To that end, NASA has been working to make flight departures out of major international airports more efficient — thereby saving fuel and reducing delays — in close collaboration with the aviation industry and the Federal Aviation Administration (FAA).
The savings are possible thanks to a NASA-developed tool called Collaborative Digital Departure Rerouting.
This tool determines where potential time savings could be gained by slightly altering a departure route, based on existing data about delays. The software presents its proposed more-efficient route in real time to an airline, who can then decide whether or not to use it and coordinate with air traffic control through a streamlined digital process.
The capability is being tested thoroughly at Dallas Fort Worth International Airport and Love Field Airport in Texas in collaboration with several major air carriers, including American Airlines, Delta, JetBlue, Southwest, and United.
Now, these capabilities are expanding out of the Dallas area to other major airports in Houston for further research.
“We’re enabling the use of digital services to greatly improve aviation efficiency,” said Shivanjli Sharma, manager of NASA’s Air Traffic Management — eXploration project which oversees the research on aviation services. “Streamlining airline operations, reducing emissions, and saving time are all part of making an efficient next-generation airspace system.”
NASA / Maria Werries The animation above shows the savings Collaborative Digital Departure Rerouting is responsible for at just a single airport. As the tool is expanded to be used at other airports, the savings begin to add up even more.
It’s all part of NASA’s vision for transforming the skies above our communities to be more sustainable, efficient, safer, and quieter.
Collaborative Digital Departure Rerouting is one of a series of new cloud-based digital air traffic management tools NASA and industry plan to develop and demonstrate as part of the agency’s Sustainable Flight National Partnership. These new flight management capabilities will contribute to the partnership’s goal of accelerating progress towards aviation achieving net-zero greenhouse gas emissions by 2050.
About the Author
John Gould
Aeronautics Research Mission DirectorateJohn Gould is a member of NASA Aeronautics' Strategic Communications team at NASA Headquarters in Washington, DC. He is dedicated to public service and NASA’s leading role in scientific exploration. Prior to working for NASA Aeronautics, he was a spaceflight historian and writer, having a lifelong passion for space and aviation.
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By NASA
15 min read
Preparations for Next Moonwalk Simulations Underway (and Underwater)
At the end of 2022, 65 percent of the Western United States was in severe drought, the result of a two decades long mega drought in the Colorado River Basin that had captured headlines around the world.
However, it was flooding, not drought, that was making headlines when we began our research for this story about OpenET, a revolutionary new online platform geared towards helping farmers and water managers monitor and reduce water use in watersheds where supplies were not keeping up with demand.
The start of 2023 brought flooding to many counties in California, leaving 68 percent of the state with suddenly little to no drought. And caused Forrest Melton, the NASA Project Scientist for OpenET and Associate Program Manager for agriculture and water resources with the NASA Earth Action program, to pause our video interview after a tree fell down outside his Bay Area home on a rainy day in March, 2023.
Coming online again after calling the fire department, Melton didn’t seem all too optimistic that the wet conditions would last. “California tends to swing between the two extremes of drought and flood,” Melton said. He referenced the 2016/17 winter which had particularly high precipitation but was followed by dry conditions during the following years, before the relief brought by the heavy rains, and flooding, in early 2023.
According to NOAA’s National Integrated Drought Information System it will take more than one wet winter to replenish groundwater in many parts of the western United States. Groundwater levels across the California Central Valley and many parts of the Ogallala Aquifer continue to decline. The need for better water management remains essential, and yet the data necessary to support new approaches has not been broadly available.
Enter the OpenET project, a multi-disciplinary, collaborative effort to make satellite-based evapotranspiration (ET) data available to the public. Melton describes the project as providing invaluable and scientifically robust data at all scales, “that can be used to support day to day decision making and long range planning to try to solve some really long standing and important water management challenges in the West.”
What is Evapotranspiration?
Evapotranspiration is the combined process of evaporation and transpiration, both of which transfer water from the land surface to the atmosphere as water vapor. Evaporation transforms water from the surface of the ground or bodies of water into water vapor, while transpiration is water vapor that is evaporated from plant tissues and escapes through the stomata, the tiny pores in plant leaves and stems. It is a process that is happening all around us almost all the time, but because water vapor is invisible to the human eye, it is very hard to measure on the ground.
A conceptual diagram of near-surface hydrology.M. W. Toews
To understand the effect evapotranspiration has on a local water cycle, picture a large decorative fountain. Typically, these fountains recycle the same water over and over. As a fountain runs, water is pumped out of the fountain heads, falls back into the fountain’s basin, and then flows back through the pipe system before starting the process all over again. We can think of the water remaining within this fountain’s local water system as non-consumptive water use. Some water, however, will be lost from the fountain’s local water system by evaporating from the pool’s surface or mist from the fountain’s spray.
Imagine the fountain also has lily pads growing in its basin. The lily pads will use the fountain’s water to survive and grow, losing some of that water to transpiration. The total water lost is evapotranspiration, and is considered consumptive water use, because it cannot be reused by the fountain. Tracking evapotranspiration can tell you how much water is removed or “depleted” from a local water system, and how much water needs to be added back in to support plant growth and maintain a healthy balance between water supply and water use. If too much water leaves the fountain, it will stop running. If too much water is added, it will overflow.
These concepts can be applied more broadly to the hydrologic cycle as a whole, and evapotranspiration data can play an important part in designing and implementing sustainable water management practices to combat larger issues like drought, as well as both short and long-term reductions in water availability. Historically, ET data have been obtained from ground-based instruments and methods, such as weighing lysimeters, which weigh soil and plants to track the water volume lost by evaporation or transpiration. Another common method is called eddy covariance, which calculates the amount of water vapor transported away from the land surface by wind eddies as they move across the land surface. But both are expensive and difficult to install and maintain, and measurements are only representative of a small portion of an individual agricultural field. It is cost prohibitive to collect these measurements over larger areas.
What makes OpenET different?
The OpenET team saw the important niche left open by traditional evapotranspiration measurement methods and filled it. They built upon decades of research funded by NASA, USDA and USGS and developed a new platform that can take easily accessible and already available data from satellite programs, like Landsat, and combine it with weather data to calculate the ET for every quarter acre of land. Satellites can record information like the Earth’s surface temperature and how much of the incoming light from the sun is being reflected back out to space. OpenET is able to use physically-based mathematical models to combine the satellite and weather data and output accurate data on evapotranspiration rates and volumes.
This information is then made easily accessible through OpenET’s Data Explorer, a free web-based tool that allows anyone with an internet connection to access the data OpenET provides. Users begin by selecting an area of interest from a map of the western United States that provides data at the satellite resolution of a quarter-acre, and also broken down into known areas of interest and individual agricultural fields, each color coded with a heat map of evapotranspiration. Cooler colors indicate higher rates of evapotranspiration while warmer colors indicate lower rates. Users can zoom into specific areas on the map, and with just a click, a chart pops up showing the evapotranspiration trends for a given area, for the current year and the past five years.
The chart can show monthly ET trends, useful for understanding seasonal fluctuations, and also cumulative trends, useful for understanding year-to-year changes in evapotranspiration. “The OpenET team took a user-driven design approach from the beginning, and each element of the Data Explorer and the open data services is there because a water manager or farmer asked for it,” Melton explained. As we played around with the map, it became apparent how much work was put into developing this project. Scientists needed to improve models and assess the accuracy of data, programmers had to develop the user interface and data services, designers needed to make the interface intuitive enough to be impactful, agriculture and environmental groups needed to help validate the model’s accuracy, and users of all types needed to provide requirements and then test the product to make sure their needs were actually met.
The OpenET consortium includes NASA, USGS, USDA Agricultural Research Service (ARS), Environmental Defense Fund (EDF), Google Earth Engine, California State University Monterey Bay (CSUMB), Desert Research Institute (DRI), Habitat Seven, Chapman University, Cornell University, University of Nebraska-Lincoln and close to a dozen other universities and experts across the U.S. NASA Ames Research Center and CSUMB have played key roles in the scientific and technical leadership of the effort from the outset, working closely with DRI, EDF and the recently formed non-profit OpenET, Inc. In addition, over 100 partners from the water management, agriculture and conservation community provided user requirements and assisted with the design and testing of the OpenET platform and tools.
“OpenET would not be possible without the contributions of each one of those partners,” Melton said. “Both on the implementation side and those who are translating the data from OpenET into solutions to long standing challenges.”
Map of farmlands showing ET data for 2024. The cooler colors represent higher levels of evapotranspiration (ET), while warmer colors indicate areas with less ET.OpenET
Models like those built into OpenET can be extremely useful tools for understanding patterns in ET and water use, but are only helpful if their accuracy is known. The OpenET science team recently completed the largest accuracy assessment to date for field-scale satellite-based ET data, comparing the satellite data to ground-based measurements at more than 150 sites across the U.S. Led by John Volk of the Desert Research Institute, the study was published in Nature Water earlier this year. A key finding was that across all sites, an ensemble value computed from six different ET models performed the best overall, leveraging the strengths of each individual satellite-driven model.
However, the study also found that some models performed best for particular crop types or regions, which is important information for water managers and farmers who need the most accurate data possible. Publishing the results as an open access study with all data and analysis made publicly available was also important to build trust in the data. While the study highlighted some limitations of the models and priorities for future research, the rigorous and reproducible accuracy assessment helps to build user confidence that they can use the data, while being aware of the expected accuracy for different applications of the data.
Bridging the Gap Between Farmers and Resource Managers
OpenET has already contributed to one significant win for farmers that affects how water use will be monitored and reported in the Sacramento-San Joaquin Delta.
This inland river delta covers 750,000 acres and is an important water resource in California, but one where accelerated demand combined with habitat loss and water quality issues has led to major concerns. In the Delta, large portions of the agricultural land are below sea level. Levees protect the fields and contain the river channels that supply water for irrigation. In 2023, the state began requiring farmers to maintain a water meter or measuring device on each diversion, where water is diverted from a river for irrigation. However, this measurement proved challenging and costly as there are thousands of diversions in the Delta, and the measuring equipment was inaccurate and difficult to maintain in this environment. In addition, water users also had to pay for meters at the locations where water that drained from the fields was pumped back over the levees and into the river channels.
The Sacramento-San Joaquin River Delta is a major water resource in California.Matthew Trump
“Mostly, what the state was interested in was the consumptive use: how much (water) was actually removed from the supply in that region,” Melton said. “So, it’s the perfect place for using OpenET because evapotranspiration really is the majority of the consumptive use in the Delta, if not all of it.”
After the launch of OpenET, farmers in the Delta worked with the Delta Watermaster, the California State Water Resources Control Board, the OpenET team and the Delta Measurement Consortium to develop an alternative compliance plan that used OpenET data to help streamline the water use required reporting for this complex region. Once the alternative compliance plan was approved, Forrest Melton and Will Carrara of NASA worked with the state Water Resources Control Board, the Delta Watermaster and water management agencies, and Jordan Harding of HabitatSeven to implement this solution. The Delta Alternative Compliance Plan, also known as the Delta ACP, allows farmers to use OpenET data to estimate their water usage; enabling farmers to complete their use reports in a matter of minutes.
“It’s the first time that satellite-based evapotranspiration data has been automatically integrated with a state-managed water reporting system,” Melton said.
Last year, more than 70% of farmers in the Bay-Delta region chose to use OpenET and to report their water use through the Delta ACP website, and they expect this percentage to continue to increase over time.
“The best part is that it is saving farmers hundreds of hours on preparing and submitting reports, avoiding millions of dollars in costs for farmers to deploy and maintain meters, and giving the state consistent and reproducible data on water use that has been reviewed and approved by the water user,” Melton said.
According to Delta Watermaster, Jay Ziegler, this approach has a clear benefit in the unique water flow setting of the Delta. “In reality, OpenET – and the use of publicly accessible data measuring ET is the only way to really discern consumptive use of water in the Delta on a reliable basis,” Ziegler said. “Candidly, we don’t really have a viable “plan B” in the absence of applying Open ET for water use reporting.”
In reality, OpenET – and the use of publicly accessible data measuring ET is the only way to really discern consumptive use of water in the Delta on a reliable basis.
Jay ziegler
Sacramento-San Joaquin Delta Watermaster
Water Beyond Borders
As water scarcity is increasingly becoming an urgent issue all around the world, it’s easy to imagine how many countries could benefit from OpenET data.
OpenET’s first international partnership is led by Anderson Ruhoff, a professor in Hydrology and Remote Sensing at the Federal University of Rio Grande do Sul, Brazil, where his team developed an evapotranspiration model called geeSEBAL for Brazil’s Water Agency.
Ruhoff learned about OpenET while he was in the US on a visiting professorship in Nebraska. He was intrigued and reached out to Melton who encouraged him to attend an upcoming conference in Reno, Nevada, where OpenET would be featured. The conference was due to start in just a few days time.
“So I had to find a last minute ticket to Reno and I’m glad I bought it, because when I arrived there they invited me to join Open ET. It was quite a coincidence,” Ruhoff said, smiling as he remembered the spontaneous decision. “We adapted our model for the US and started to participate in their work.”
In March, 2024, Ruhoff and OpenET launched an extension of the tool, called OpenET Brazil, with financial support from the Agência Nacional de Águas e Saneamento Básico (ANA), the Brazilian national water agency. The tool, called OpenET Brazil, will have similar goals as OpenET in the U.S., and the data collected will help improve Open ET’s accuracy overall.
Melton feels this will be a “great test case” for both working with new environmental conditions (in Brazil there frequently is more cloud cover than in the US during key parts of the growing season) and also developing new collaborations.
“The partnership will help us figure out how we can work with international partners to make the ET data useful,” Melton said. “The key aspect of our approach to geographic expansion is that leading scientists in each country and region, like Dr. Ruhoff, will lead the implementation, accuracy assessment, and the development of applications and partnerships for their country.”
Brazil has one of the world’s largest sources of freshwater, the Amazon River, and yet it can still be affected by drought. This is partly due to the fact that deforestation in the Amazon Rainforest has an impact on the entire region’s water cycle. Trees draw water up from the soil and during photosynthesis they release vapor into the atmosphere. This water vapor will accumulate and form precipitation. Trees are “basically a huge water pump,” Ruhoff said, and the Amazon Rainforest is large enough that it helps to produce the rainy season. But when deforestation is allowed to happen over large areas, that mechanism is interrupted. As a result of this disruption, the dry season is predicted to intensify, becoming longer and dryer, which in turn can affect crop production in Brazil as well as the rainfall that is critical for sustaining water supplies in Brazil and other areas of South America.
“Water doesn’t see borders. It doesn’t follow our rules,” Ruhoff said. “Deforestation in one place can affect people thousands of kilometers away.”
Water doesn’t see borders. It doesn’t follow our rules. Deforestation in one place can affect people thousands of kilometers away.
Anderson Ruhoff
Professor of Hydrology and Remote Sensing, Federal University of Rio Grande do Sul, Brazil
Studying evapotranspiration can reveal the impacts of deforestation with even more clarity. And importantly, it’s also public information. “So not only the farmers and water managers but every citizen can check how much water is being used in their area, especially during drought. It’s democratic information in that way,” Ruhoff said. “I think it’s important to have this information openly available and to try and reach as many people as possible.”
Melton feels there’s the potential to expand the project, if more people like Ruhoff are there to lead the way.
“There’s huge potential, but there do need to be stakeholders that come to the table and say that this is something that they’re interested in,” Melton said. “Water is so important and at times so contentious that it’s really important the data is seen as trusted. When there is a local leader, that substantially increases the likelihood that it will be trusted, and most importantly, used to bring people together to develop solutions.”
The geeSEBAL application that Anderson Ruhoff’s team developed, which now informs the OpenET platform. Science Direct/Anderson Ruhoff
Even when you live in a water-scarce region like California it’s easy to take water for granted. What platforms like OpenET can do for us, however, is make water, even in its most diffuse form, more visible to everyone.
Written by Jane Berg and Rachel Sender, co-published with the Bay Area Environmental Research Institute
To learn more about OpenET, visit https://etdata.org/
Program Contact:
Forrest Melton
NASA Ames Research Center
forrest.s.melton@nasa.gov
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Last Updated Oct 14, 2024 Related Terms
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NASA Develops Process to Create Very Accurate Eclipse Maps
New NASA research reveals a process to generate extremely accurate eclipse maps, which plot the predicted path of the Moon’s shadow as it crosses the face of Earth. Traditionally, eclipse calculations assume that all observers are at sea level on Earth and that the Moon is a smooth sphere that is perfectly symmetrical around its center of mass. As such, these calculations do not take into account different elevations on Earth or the Moon’s cratered, uneven surface.
For slightly more accurate maps, people can employ elevation tables and plots of the lunar limb — the edge of the visible surface of the Moon as seen from Earth. However, now eclipse calculations have gained even greater accuracy by incorporating lunar topography data from NASA’s LRO (Lunar Reconnaissance Orbiter) observations.
Using LRO elevation maps, NASA visualizer Ernie Wright at NASA’s Goddard Space Flight Center in Greenbelt, Maryland, created a continuously varying lunar limb profile as the Moon’s shadow passes over the Earth. The mountains and valleys along the edge of the Moon’s disk affect the timing and duration of totality by several seconds. Wright also used several NASA data sets to provide an elevation map of Earth so that eclipse observer locations were depicted at their true altitude.
The resulting visualizations show something never seen before: the true, time-varying shape of the Moon’s shadow, with the effects of both an accurate lunar limb and the Earth’s terrain.
“Beginning with the 2017 total solar eclipse, we’ve been publishing maps and movies of eclipses that show the true shape of the Moon’s central shadow — the umbra,” said Wright.
A map showing the umbra (the Moon’s central shadow) as it passes over Cleveland at 3:15 p.m. local time during the April 8, 2024, total solar eclipse. NASA SVS/Ernie Wright and Michaela Garrison “And people ask, why does it look like a potato instead of a smooth oval? The short answer is that the Moon isn’t a perfectly smooth sphere.”
The mountains and valleys around the edge of the Moon change the shape of the shadow. The valleys are also responsible for Baily’s beads and the diamond ring, the last bits of the Sun visible just before and the first just after totality.
A computer simulation of Baily’s beads during a total solar eclipse. Data from Lunar Reconnaissance Orbiter makes it possible to map the lunar valleys that create the bead effect. NASA SVS/Ernie Wright Wright is lead author of a paper published September 19 in The Astronomical Journal that reveals for the first time exactly how the Moon’s terrain creates the umbra shape. The valleys on the edge of the Moon act like pinholes projecting images of the Sun onto the Earth’s surface.
A visualization of Sun images being projected from lunar valleys that are acting like pinhole projectors. Light rays from the Sun converge on each valley, then spread out again on their way to the Earth. NASA SVS/Ernie Wright The umbra is the small hole in the middle of these projected Sun images, the place where none of the Sun images reach.
Viewed from behind the Moon, the Sun images projected by lunar valleys on the Moon’s edge fall on the Earth’s surface in a flower-like pattern with a hole in the middle, forming the umbra shape. NASA SVS/Ernie Wright The edges of the umbra are made up of small arcs from the edges of the projected Sun images.
This is just one of several surprising results that have emerged from the new eclipse mapping method described in the paper. Unlike the traditional method invented 200 years ago, the new way renders eclipse maps one pixel at a time, the same way 3D animation software creates images. It’s also similar to the way other complex phenomena, like weather, are modeled in the computer by breaking the problem into millions of tiny pieces, something computers are really good at, and something that was inconceivable 200 years ago.
For more about eclipses, refer to:
https://science.nasa.gov/eclipses
By Ernie Wright and Susannah Darling
NASA’s Goddard Space Flight Center, Greenbelt, Md.
Media Contact:
Nancy Neal-Jones
NASA’s Goddard Space Flight Center, Greenbelt, Md.
301-286-0039
nancy.n.jones@nasa.gov
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Last Updated Sep 19, 2024 Editor wasteigerwald Contact wasteigerwald william.a.steigerwald@nasa.gov Location NASA Goddard Space Flight Center Related Terms
Lunar Reconnaissance Orbiter (LRO) Solar Eclipses Uncategorized Explore More
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