Agricultural and Water Resources Data Pathfinder
The economic impacts associated with compromised water availability and food production due to flooding, severe storms, and drought are devastating for countries. Drought, in fact, ranks as one of the top weather-related disasters, following severe storms and inland flooding. As such, it is critical for water resource managers and agricultural decision makers to monitor water availability and drought conditions.
When forecasting future events or responding to current events, there are three primary areas of focus: land, water, and vegetation. On Earth's land surface we can observe reflectance, temperature, elevation, and possible runoff. With water, we can look at precipitation, snow water equivalent, groundwater, and soil moisture, whether from a water availability standpoint or for the assessment of irrigation strategies. With vegetation, we can assess ecosystem health and phenology through vegetation indices such as the Normalized Difference Vegetation Index (NDVI) and Enhanced Vegetation Index (EVI), characterize vegetation structure through variables such as Leaf Area Index (LAI), and monitor how plants use water via evapotranspiration (ET). This pathfinder is divided into these three primary sections, providing measurements to help in making agricultural and water management decisions, as well as information to assess Sustainable Development Goals (SDGs). In addition, there is a SDG 2 Zero Hunger Data Pathfinder for more information on meeting SDG targets.
About the Data
NASA collaborates with other federal entities and international space organizations, including NOAA, USGS, the Japan Aerospace Exploration Agency and Ministry of Economy, Trade, and Industry, and the European Space Agency, to provide a combination of ground- and satellite-based data that provides a unique view of the globe to better understand the impacts of climate change. Satellite and ground-based measurements help scientists, researchers, and decision makers in forecasting events and assessing conditions in near real-time. NASA, in collaboration with other organizations, has a series of instruments that provide information for understanding a number of phenomena associated with water availability and crop yield. NASA's Earth science data products are validated, meaning the accuracy has been assessed over a widely distributed set of locations and time periods via several ground-truth and validation efforts.
Datasets referenced in this pathfinder are from sensors shown in the table below, with their spatial and temporal resolutions. NASA's Land, Atmosphere Near real-time Capability for EOS (LANCE) provides select datasets to the public generally within three hours of satellite observation, which allows for near real-time (NRT) monitoring and decision making.
Note: This is not an exhaustive list of datasets but rather only includes datasets available through NASA's Earth Observing System Data and Information System (EOSDIS).
|Measurement||Satellite||Sensor||Spatial Resolution||Temporal Resolution|
|Elevation||Shuttle Radar Topography Mission (SRTM)||30 m|
|Evaporative Stress Index, Evapotranspiration||International Space Station||ECOsystem Spaceborne Thermal Radiometer Experiment on Space Station (ECOSTRESS)||70 x 70 m, 30 x 30 m||Target areas every 1-7 days|
|Evapotranspiration, Land Cover Type, Land Surface Temperature, Snow Cover, Surface Reflectance, Vegetation Indices||Terra and Aqua||Moderate Resolution Imaging Spectroradiometer (MODIS) *||250 m, 500 m, 1 km||1-2 days|
|Groundwater||Gravity Recovery and Climate Experiment (GRACE)||0.125°||Giovanni: daily Earthdata: 7-day|
|Land Surface Temperature, Snow Cover, Surface Reflectance, Vegetation Indices||Joint NASA/NOAA Suomi National Polar-orbiting Partnership (Suomi NPP)||Visible Infrared Imaging Radiometer Suite (VIIRS) *||325-750 m||1-2 days|
|Land Surface Temperature, Surface Reflectance||Landsat 8||Operational Land Imager (OLI)
Thermal Infrared Sensor (TIRS)
|15, 30, 60 m||16 days|
|Precipitation||Integrated multi-satellite data||Tropical Rainfall Measuring Mission (TRMM) Multi-satellite Precipitation Algorithm (TMPA) and Integrated Multi-satellite Retrievals for Global Precipitation Measurement (GPM) (IMERG)||0.1° x 0.1° or 0.25° x 0.25°||half hourly, daily, monthly|
|Precipitation, Snow Water Equivalent (SWE)||Japanese Aerospace Exploration Agency Global Change Observation Mission -Water Satellite 1 ("Shizuku"), (GCOM-W1)||Advanced Microwave Scanning Radiometer 2 (AMSR2) *||Precipitation Rate: imagery resolution is 2 km, sensor resolution is 5 km
SWE: 25 km
|Precipitation rate: daily
SWE: daily, 5-day, monthly
|Snow Water Equivalent||Aqua||Advanced Microwave Scanning Radiometer - Earth Observing System (AMSR-E)
(Data only available through 2011)
|25 km||daily, 5-day, monthly|
|Soil Moisture||Soil Moisture Active Passive (SMAP)||Radar (active sensor; no longer functional)
Microwave radiometer (passive sensor)
|10-40 km||3 days|
|Surface Kinetic Temperature, Surface Reflectance, Topography||Terra||Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER)||15 m Very Near Infrared (VNIR), 30 m short-wave infrared (SWIR), 90 m thermal infrared (TIR)||Variable|
|* sensors from which select datasets are available in LANCE
In addition to mission data, NASA has a series of models that use remote sensing data as inputs to obtain more complex data parameters. The Land Data Assimilation System (LDAS) provides data within a global collection (GLDAS) and a North American collection (NLDAS). LDAS takes inputs of measurements like precipitation, soil texture, topography, and leaf area index and uses these inputs to model output estimates of runoff and evapotranspiration.
Land Data Assimilation System (LDAS)
Land surface temperature, runoff, soil moisture
Monthly, daily, hourly
Use the Data
Scientists, researchers, land managers, and decision makers use remote sensing data in numerous ways (to see data use stories, see the Data in Action Page at NASA's Land Processes Distributed Active Archive Center [LP DAAC] or read the Data User Profiles and Freshwater Feature Articles on Earthdata). Satellite imagery coupled with ground-based data aids in water allocation, agricultural monitoring, irrigation management, flood and drought management, reservoir and dam management, and food security. NASA Earth science observations are transforming our approach to some of these critical issues.
- NASA At Your Table: The Space Agency’s Surprising Role in Agriculture
- NASA at Your Table: Earth Data Informs Agriculture and Water Resource Management
- Measuring the World's Croplands
- Sizing Up How Agriculture Connects to Deforestation
- Feeding the Sea
- Finding New Ways to Feed the World
- Agricultural Monitoring Gets GLAMorized
- Investigating a Derecho’s Devastating Effects
- Protecting Farmers' Livelihoods Using Satellite Imagery
- NASA Addressing Global Challenges: Food Security
- Transforming Water Management in the U.S. West with NASA Data
- Derecho Flattens Iowa Corn
- A Third of the U.S. Faces Drought
- When Rivers are Borders
Other NASA Assets of Interest
NASA's Socioeconomic Data and Applications Center (SEDAC) is NASA's Earth Observing System Data and Information System (EOSDIS) DAAC responsible for archiving and distributing socioeconomic data in the EOSDIS collection, and is hosted at Columbia University's Center for International Earth Science Information Network. SEDAC serves as an "Information Gateway" between the socioeconomic and Earth science data and information domains.
SEDAC includes a number of data collections relevant to food security and agriculture, including:
- Past, present, and future population distribution
- Reservoirs and dams
- Agricultural land coverage/acreage/area
- Drought frequency and distribution
- Economic and mortality risks from natural disasters
- Flood frequency and distribution
- Food insecurity hotspots
- Agricultural pesticide use
- Nitrogen and phosphorus fertilizer application
- Global roads
- Environmental performance indicators
These datasets are available in either GeoTIFF or ESRI Grid format. Many of these datasets can be visualized using the SEDAC Map Viewer.
NASA's Goddard Earth Sciences Data and Information Services Center (GES DISC) optimally reorganized some large hydrological datasets as time series (also known as data rods) for a set of water cycle-related variables from the NLDAS and GLDAS, the Land Parameter Parameter Model (LPRM), TRMM, and GRACE data assimilation. These are available at GES DISC Hydrology Data Rods. GES DISC also provides several other model soil moisture datasets: the LPRM product and the SoilMERGE (SMERGE) product. Spaceborne observed brightness temperatures are converted, using LPRM, to soil moisture, and the SMERGE product combines long-term (January 1979–May 2019) satellite-based soil moisture retrievals with land surface model estimates acquired from Phase 2 of the NLDAS to produce a 0.125-degree, daily, root-zone soil moisture product within the conterminous United States.
NASA's Applied Sciences Agriculture Program Area promotes the use of Earth observations to strengthen food security, support market stability, and protect human livelihoods. NASA Harvest, which is managed under the Agriculture Program Area, is a multidisciplinary consortium commissioned by NASA and led by the University of Maryland to enhance the use of satellite data in decision making related to food security and agriculture both domestically and globally. NASA Harvest has prioritized three impact areas: agricultural land use, agricultural sustainability, and agricultural productivity, and aims to improve each of these areas as well as the methods and products that provide actionable information and insight about them, from farm to global scales. Together with partners in the U.S. and around the world, they help bolster food security, improve agricultural resilience, and reduce price volatility for vulnerable communities.
NASA's Applied Sciences Water Resources Application Area supports partnerships and applied research to discover, develop, and demonstrate new practical uses for NASA's Earth observations by the water resources management community. They work with a wide range of partners in the U.S. and around the world to find innovative solutions as shifts in land use, changing climates, and growing populations stress water supplies. The Water Resources Applications Area also supports NASA's Western Water Applications Office (WWAO), which works closely with water resource management partners in the Western U.S., and NASA Harvest, which engages with both domestic and international partners in the agricultural sector.
NASA's Applied Sciences Program supports two additional food security-related initiatives: the Group on Earth Observations Global Agricultural Monitoring Crop Monitor For Early Warning (CM4EW) and the Drought Severity Evaluation Tool (DSET). CM4EW provides monthly transparent, multi-source, consensus assessments of crop growing conditions, status, and agro-climatic conditions that are likely to impact production in countries vulnerable to food insecurity to strengthen agricultural, humanitarian intervention, and food security decision making and policy implementations.
DSET was developed as part of NASA's Navajo Nation Drought Project. A collaborative effort of WWAO, the Navajo Nation Department of Water Resources, and the Desert Research Institute, DSET improves drought reporting and monitoring in the Navajo Nation, which covers an area in northern Arizona, southern Utah, and northern New Mexico roughly the size of the U.S. state of West Virginia.
The Global Database of Soil Respiration Data, available at ORNL DAAC, provides soil respiration measurements, which encompass the flux of autotrophically- and heterotrophically-generated CO2 from the soil to the atmosphere. The Carbon Fluxes from Global Agricultural Production and Consumption dataset, which is part of NASA's Carbon Monitoring System program (CMS), is also available at ORNL DAAC and provides global estimates of carbon fluxes associated with annual crop net primary production (NPP) and harvested biomass, annual uptake and release by humans and livestock, and the total annual estimate of net carbon exchange (NCE) derived from these carbon fluxes. NCE estimates are for the combined crop plant harvest and consumption/expiration of fodder by livestock and of food by humans.
The NASA-funded Methane Source Finder project mapped potential sources of methane in the state of California and developed new technologies to make remote sensing data of methane emissions readily available. Additional funding for this effort was provided by the California Air Resources Board, the California Energy Commission, the National Institute of Standards and Technology, Rocky Mountain Institute, and the University of Arizona. Read more about this effort at From Cow Manure to Landfills: Mapping Methane in California.
OpenET is a new web-based platform that puts openly-available evapotranspiration (ET) data in the hands of farmers, water managers, and conservation groups to speed up improvements and bring about innovation in water management across 17 states in the Western U.S. The project is being led by NASA, the Desert Research Institute (DRI), and the Environmental Defense Fund (EDF), with in-kind support from Google Earth Engine. It uses publicly-available data and open-source models to deliver satellite-based ET information in areas as small as a quarter of an acre and at daily, monthly, and yearly intervals.
ARSET's Satellite Remote Sensing for Agricultural Applications addresses how to use remote sensing data for agriculture monitoring, specifically drought and crop monitoring. The webinar provides end-users the ability to evaluate which regions of the world have agricultural productivity above or below long-term trends. This informs decisions pertaining to market stability and humanitarian relief.NASAaccess is an R package that can generate gridded ASCII tables of climate (CIMP5) and weather data (GPM, TRMM, GLDAS) needed to drive various hydrological models (e.g., SWAT, VIC, RHESSys).
Lake Observations by Citizen Scientists and Satellites (LOCSS) is a citizen science program funded by NASA's Earth Science Data Systems (ESDS) Program to better understand how the water volume in lakes is changing. Citizen scientists report lake height by reading simple lake gauges. The data collected will be used to provide a foundation for the upcoming Surface Water and Ocean Topography (SWOT) mission (scheduled for launch in 2022). SWOT will be able to measure lake height and surface area simultaneously allowing for global measurements of lake water storage.
NASA's Short-term Prediction Research and Transition Center (SPoRT) is a project to transition unique observations and research capabilities to the operational weather community to improve short-term forecasts on a regional scale. The SPoRT site provides access to real-time data from a variety of missions, as well as evaluation- and research-based modeling products.
Several tools consolidate a lot of food security and agriculture information at the U.S. national level and at the global level:
- The Famine Early Warning System Network, which was created in 1985 by the U.S. Agency for International Development, provides early warning and analysis on acute food insecurity. Analysts and specialists in 22 field offices work with U.S. government science agencies, national government ministries, international agencies, and non-governmental organizations (NGOs) to produce forward-looking reports on more than 36 of the world's most food-insecure countries.
- NOAA's National Integrated Drought Integration System provides drought-related information and resources and also has a suite of data, maps, and tools for exploring drought across the U.S.
- The European Commission's European Drought Observatory provides drought-related information across Europe. The site contains data-based maps of indicators, tools for visualizing and analyzing the information, and reports of specific regional droughts.
- The GEOGLAM Global Rangelands and Pasture Productivity Map is an online geospatial tool that provides information derived from Earth observations about the state and condition of global rangelands.
- Data Rods Explorer is a web client app that enables users to browse several NASA-hosted datasets. The interface enables the visualization and downloading of NASA observation retrievals (parameters have been retrieved from the raw data through a series of steps) and land surface model (LSM) outputs by space, time, and variable. The key variables are precipitation, wind, temperature, surface downward radiation flux, heat flux, humidity, soil moisture, groundwater, runoff, and evapotranspiration. These variables describe the main components of the water cycle over land masses.
- United Nations Water Data Lab allows for multi-criteria analysis of the Sustainable Development Goal 6 (Clean Water and Sanitation) data. Users can define one or more filter criteria and identify countries (or areas) meeting the selected criteria along with information about population and land area. For example, you can identify countries in Asia where at least 80% of the population has access to safe drinking water and the Gross Domestic Product per capita is below USD $20,000.
Benefits and Limitations of Remote Sensing Data
In determining whether or not to use remote sensing data, it is important to understand not only the benefits but also the limitations of the data. Benefits of using satellite data include:
- Filling in data gaps: the U.S. is fortunate to have numerous ground-based measurements for assessing water storage, precipitation, and more. However, this is not the case in other countries and even in some of the more remote areas of the U.S. Satellite data provide local, regional, and global spatial coverage and also are useful for observing areas that are inaccessible.
- Monitoring in near real-time: some satellite information is available three to five hours after observation, allowing for a faster response.
With satellite data, assessments can be made regarding the land surface, runoff, irrigation needs, and crop health. Incorporating satellite data with in-situ data into modeling programs makes for a more robust and integrated forecasting system.
There are limitations specific to using satellite data in water availability and agricultural assessments.
- Spatial resolution: While lower resolution data provide a more global view, often, as with measurements from NASA's Soil Moisture Active Passive (SMAP) satellite, the spatial resolution is too coarse for farm field-level assessments. This is not the case for instruments that collect data at higher resolutions, like those aboard the joint NASA/USGS Landsat series of satellites.
- Temporal resolution: Many satellites only pass over the same spot on Earth every one to two days and sometimes as seldom as every 16 days or more.
- Spectral Resolution: Passive instruments (those that use energy reflected or emitted from Earth for measurements) are not able to penetrate cloud or vegetation cover, which can lead to data gaps or a decrease in data utility. This is not the case when using data from microwave or thermal sensors (active sensors).
It is difficult to combine all of the desirable features into one remote sensor. To acquire observations with high spatial resolution (like Landsat), a narrower swath is required. This, in turn, requires more time between observations of a given area and results in a lower temporal resolution. Researchers have to make trade-offs. Finding a sensor with the spatio-temporal resolution capable of addressing your research, application, or decision making process needs is a crucial first step to getting started with using remote sensing data.
Please visit the Earthdata Forum, where you can interact with other data users and NASA subject matter experts on a variety of Earth science research and applications topics.
Published May 21, 2019
Page Last Updated: Sep 27, 2021 at 7:30 PM EDT