Animation of SMAP trajectory around Earth

Soil Moisture Active Passive (SMAP) is a

NASA The National Aeronautics and Space Administration (NASA ) is an independent agency of the US federal government responsible for the civil space program, aeronautics research, and space research. NASA was established in 1958, succeedin ...

environmental monitoring Environmental monitoring describes the processes and activities that need to take place to characterize and monitor the quality of the environment. Environmental monitoring is used in the preparation of environmental impact assessments, as well a ...

satellite that measures soil moisture across the planet. It is designed to collect a global 'snapshot' of soil moister every 2 to 3 days. With this frequency, changes from specific storms can be measured while also assessing impacts across seasons of the year. SMAP was launched on 31 January 2015. It was one of the first

Earth observation satellite An Earth observation satellite or Earth remote sensing satellite is a satellite used or designed for Earth observation (EO) from orbit, including spy satellites and similar ones intended for non-military uses such as environmental monitoring, ...

s developed by NASA in response to the National Research Council's Decadal Survey. NASA invested US$916 million in the design, development, launch, and operations of the program.

Mission overview

SMAP provides measurements of the land surface

soil moisture Soil moisture is the water content of the soil. It can be expressed in terms of volume or weight. Soil moisture measurement can be based on ''in situ'' probes (e.g., capacitance probes, neutron probes) or remote sensing methods. Water that enter ...

and freeze-thaw state with near-global revisit coverage in 2–3 days. SMAP surface measurements are coupled with hydrologic models to infer soil moisture conditions in the root zone. These measurements enable science applications users to: # Understand processes that link the terrestrial water, energy, and

carbon cycle The carbon cycle is the biogeochemical cycle by which carbon is exchanged among the biosphere, pedosphere, geosphere, hydrosphere, and atmosphere of the Earth. Carbon is the main component of biological compounds as well as a major compon ...

s. # Estimate global water and energy fluxes at the land surface. # Quantify net carbon flux in boreal landscapes. # Enhance weather and climate forecast skill. # Develop improved flood prediction and drought monitoring capability. SMAP observations are acquired for a period of at least three years after launch, and the 81 kg of propellant that it carries should allow the mission to operate well beyond its design lifetime. A comprehensive validation, science, and the application program are implemented, and all data are publicly available through the NASA archive centers.

Measurement concept

The SMAP observatory includes a dedicated spacecraft and instrument suite in a near-polar, Sun-synchronous orbit. The SMAP measurement system consists of a

radiometer A radiometer or roentgenometer is a device for measuring the radiant flux (power) of electromagnetic radiation. Generally, a radiometer is an infrared radiation detector or an ultraviolet detector. Microwave radiometers operate in the microwave ...

(passive) instrument and a

synthetic-aperture radar Synthetic-aperture radar (SAR) is a form of radar that is used to create two-dimensional images or three-dimensional reconstructions of objects, such as landscapes. SAR uses the motion of the radar antenna over a target region to provide fin ...

(active) instrument operating with multiple polarizations in the

L-band The L band is the Institute of Electrical and Electronics Engineers (IEEE) designation for the range of frequencies in the radio spectrum from 1 to 2 gigahertz (GHz). This is at the top end of the ultra high frequency (UHF) band, at the lowe ...

range. The combined active and passive measurement approach takes advantage of the spatial resolution of the radar and the sensing accuracy of the radiometer. The active and passive sensors provide coincident measurements of the surface-emission and backscatter. The instruments sense conditions in the top 5 cm of soil through moderate vegetation cover to yield globally mapped estimates of soil moisture and its freeze-thaw state. The spacecraft orbits Earth once every 98.5 minutes and repeats the same ground track every eight days.

Scientific payload

The satellite carries two scientific instruments: a radar and a radiometer, that share a single feed and deployable 6 m reflector antenna system, built by Northrop Grumman,NASA.gov
/ref> that rotates around the

nadir The nadir (, ; ar, نظير, naẓīr, counterpart) is the direction pointing directly ''below'' a particular location; that is, it is one of two vertical directions at a specified location, orthogonal to a horizontal flat surface. The direc ...

axis making conical scans of the surface. The wide swath provides near-global revisit every 2–3 days.

SMAP system characteristics

Auxiliary Payloads

Educational Launch of Nanosatellite X (ELaNa X), consisting of three Poly Picosatellite Orbital Deployers containing four CubeSats (three CubeSat missions), mounted on the second stage of the Delta II launch vehicle: * ExoCube, a space weather satellite developed by California Polytechnic State University, and sponsored by the National Science Foundation. Cal Poly designed the core-satellite bus, while the scientific payload is supplied by NASA's Goddard Space Flight Center. The University of Wisconsin, at Madison, and Scientific Solutions, Inc. (SSI) are developing the scientific objectives and providing guidance for instrument development. ExoCube measures the density of hydrogen, oxygen, helium, and nitrogen in Earth's upper atmosphere (exosphere and thermosphere) using direct mass spectroscopy measurements. The size of ExoCube is three CubeSat units, or 30 x 10 x 10 cm. * GRIFEX, the Geo-cape Roic In-Flight performance Experiment, developed by the University of Michigan's Michigan Exploration Laboratory in partnership with NASA's Earth Science Technology Office and NASA's Jet Propulsion Laboratory. This is a technology validation mission that performs an engineering assessment of a JPL-developed all digital high-performance focal plane array consisting of an innovative in-pixel analog-to-digital readout integrated circuit. Its high throughput capacity enables the proposed Geostationary Coastal and Air Pollution Events (GEO-CAPE) satellite mission concept to make hourly high spatial and spectral resolution measurements of rapidly changing atmospheric chemistry and pollution with the Panchromatic Fourier Transform Spectrometer (PanFTS) instrument in development. GRIFEX advances the technology required for future space-borne measurements of atmospheric composition from geostationary orbit that are relevant to climate change, as well as future missions that require advanced detectors in support of the

Earth Science Decadal Survey The ''Earth Science Decadal Survey'' (in full: ''U.S. National Academy of Sciences Decadal Survey for Earth Science and Applications from Space'') is a publication of the United States National Research Council that identifies key research priori ...

. The size of GRIFEX is three CubeSat units, or 30 x 10 x 10 cm. * FIREBIRD-II (A and B), developed by the University of New Hampshire, Montana State University, Los Alamos National Laboratory, and the Aerospace Corporation. FIREBIRD-II is a two-CubeSat space weather project to resolve the spatial scale, size, and energy dependence of electron microbursts in the Van Allen radiation belts. Relativistic electron microbursts appear as short periods of intense electron precipitation measured by particle detectors on low-altitude spacecraft, seen when their orbits cross magnetic field lines that thread the outer radiation belt. FIREBIRD-II provides dual point radiation belt measurements that offer insight into electron acceleration and loss processes in the outer Van Allen radiation belt. Each of the FIREBIRD CubeSats is 1.5 CubeSat units in size, or 15 x 10 x 10 cm. The CubeSat projects are deployed at a minimum of 2,896 seconds after the separation of the Soil Moisture Active Passive observatory, into a 440 x 670 km, 99.12° inclination orbit.

Program description

SMAP is a directed mission of the National Aeronautics and Space Administration. The SMAP project is managed for NASA by the Jet Propulsion Laboratory, with participation by the

Goddard Space Flight Center The Goddard Space Flight Center (GSFC) is a major NASA space research laboratory located approximately northeast of Washington, D.C. in Greenbelt, Maryland, United States. Established on May 1, 1959 as NASA's first space flight center, GSFC empl ...

. SMAP builds on the heritage and risk reduction activities of NASA's cancelled ESSP Hydros Mission.

Science and applications

SMAP observations are used to characterize hydrologic and ecosystem processes including land-atmosphere exchanges of water, energy, and carbon. Among the users of SMAP data are hydrologists, weather forecasters, climate scientists and agricultural and water resource managers. Additional users include fire hazard and flood disaster managers, disease control and prevention managers, emergency planners and policy makers. SMAP soil moisture and freeze-thaw information directly benefit several societal applications areas, including:

Weather and climate forecasting

Initialization of

numerical weather prediction Numerical weather prediction (NWP) uses mathematical models of the atmosphere and oceans to predict the weather based on current weather conditions. Though first attempted in the 1920s, it was not until the advent of computer simulation in th ...

models and seasonal climate models with accurate soil moisture information extend forecast lead times and enhance prediction skill.

Drought

SMAP soil moisture information improves the monitoring and forecasting of

drought A drought is defined as drier than normal conditions.Douville, H., K. Raghavan, J. Renwick, R.P. Allan, P.A. Arias, M. Barlow, R. Cerezo-Mota, A. Cherchi, T.Y. Gan, J. Gergis, D. Jiang, A. Khan, W. Pokam Mba, D. Rosenfeld, J. Tierney, an ...

conditions, enabling new capabilities for mitigating drought impacts.

Floods and landslides

Hydrologic forecast systems calibrated and initialized with high-resolution soil moisture fields lead to improved

flood A flood is an overflow of water ( or rarely other fluids) that submerges land that is usually dry. In the sense of "flowing water", the word may also be applied to the inflow of the tide. Floods are an area of study of the discipline hydrol ...

forecasts and provide essential information on the potential for

landslide Landslides, also known as landslips, are several forms of mass wasting that may include a wide range of ground movements, such as rockfalls, deep-seated slope failures, mudflows, and debris flows. Landslides occur in a variety of environmen ...

Agricultural productivity

Soil moisture observations from SMAP lead to improvements in

crop yield In agriculture, the yield is a measurement of the amount of a crop grown, or product such as wool, meat or milk produced, per unit area of land. The seed ratio is another way of calculating yields. Innovations, such as the use of fertilizer, the c ...

forecasts and enhance the capabilities of crop water stress decision support systems for

agricultural productivity Agricultural productivity is measured as the ratio of agricultural outputs to inputs. While individual products are usually measured by weight, which is known as crop yield, varying products make measuring overall agricultural output difficu ...

Human health

Improved seasonal soil moisture forecasts directly benefit

famine A famine is a widespread scarcity of food, caused by several factors including war, natural disasters, crop failure, population imbalance, widespread poverty, an economic catastrophe or government policies. This phenomenon is usually accompan ...

early warning systems. Benefits also are realized through improved predictions of

heat stress Hyperthermia, also known simply as overheating, is a condition in which an individual's body temperature is elevated beyond normal due to failed thermoregulation. The person's body produces or absorbs more heat than it dissipates. When extreme ...

and

virus A virus is a submicroscopic infectious agent that replicates only inside the living cells of an organism. Viruses infect all life forms, from animals and plants to microorganisms, including bacteria and archaea. Since Dmitri Ivanovsk ...

spread rates, and improved

disaster preparation Emergency management or disaster management is the managerial function charged with creating the framework within which communities reduce vulnerability to hazards and cope with disasters. Emergency management, despite its name, does not actuall ...

and response.

Status

In August 2015, scientists completed their initial calibration of the two instruments on board, however, SMAP's radar stopped transmitting 7 July due to an anomaly that was investigated by a team at JPL. The team identified the anomaly to the power supply for the radar's high-power amplifier. On 2 September 2015, NASA announced that the amplifier failure meant that the radar could no longer return data. The science mission continues with data being returned only by the radiometer instrument. SMAP's prime mission ended in June 2018. The 2017 Earth Science senior review endorsed the SMAP mission for continued operations through 2020, and preliminarily, through 2023.NASA.gov
/ref>

Notes

References

External links

SMAP website
at NASA/JPL

at the National Snow and Ice Data Center

article at NASA.gov
"NASA's New Studies of Earth's Seas, Skies and Soils"
article at NASA.gov {{Orbital launches in 2015 Earth observation satellites of the United States Spacecraft launched in 2015 Spacecraft launched by Delta II rockets NASA satellites Space synthetic aperture radar