Soil moisture probes are in situ ground-based sensors used to measure soil water content. The most common type of soil moisture probes used for scientific research use dielectric permittivity techniques such as capacitance sensors or time-domain reflectometry sensors. These types of probes measure the charge-storage capacity of the soil to determine the soil moisture content. They typically operate at frequencies around 50 MHz and above to reduce sensitivity to salinity. Soil moisture probes provide continuous measurements and are relatively easy to deploy.
Instrument Details
- Temperature/Humidity
- Earth Science > Land Surface > Soils > Soil Moisture/water ContentEarth Science > Land Surface > Soils > Soil TemperatureEarth Science > Land Surface > Soils > Soil Salinity/soil SodicityEarth Science > Land Surface > SoilsEarth Science > Agriculture > Soils > Soil Moisture/water Content
- Subsurface - Land
- Variable
- Point
- ~50 MHz
- Currently unavailble
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 Campaign Field Sites Stationary 60 Campaigns · 165 Instruments |  Integrated Precipitation and Hydrology Experiment 2014 Southern Appalachians, including portions of North Carolina, South Carolina, Tennessee, Georgia 1 Deployment · 47 Data Products
AfriSAR AfriSAR 2015—2016 Gabon tropical forests 1 Deployment · 11 Data Products
 Iowa Flood Studies 2013 Iowa 1 Deployment · 33 Data Products
 Southern African Regional Science Initiative 1999—2001 Southern Africa 4 Deployments · 117 Data Products
 First International Satellite Land Surface Climatology Project (ISLSCP) Field Experiment 1987—1989 Central Kansas 2 Deployments · 101 Data Products
 Boreal Ecosystem-Atmosphere Study 1994—1996 Boreal forests of central Canada 2 Deployments · 303 Data Products
 SnowEx 2016—2023 Colorado, Idaho, Utah, Alaska Ongoing 4 Deployments · 26 Data Products
 CalWater 2015 California, Sierra Nevada Range 1 Deployment · 0 Data Products
 GPM Cold Season Precipitation Experiment 2012 Ontario, Canada and northern portions of the United States (e.g., New York state, the New England area, etc.) 1 Deployment · 44 Data Products
SMEX Soil Moisture Experiment 2002—2005 Iowa, Oklahoma, Georgia, Alabama, Arizona, Sonora, Mexico 4 Deployments · 0 Data Products
SMAPVEX Soil Moisture Active Passive Validation Experiment 2008—2022 United States, Canada, Iowa, Maryland, Arizona, Massachusetts, Manitoba 5 Deployments · 25 Data Products
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 Campaign Permanent Land Sites Stationary 45 Campaigns · 73 Instruments |  Airborne Microwave Observatory of Subcanopy and Subsurface 2012—2015 North America 40 Deployments · 19 Data Products
SMEX Soil Moisture Experiment 2002—2005 Iowa, Oklahoma, Georgia, Alabama, Arizona, Sonora, Mexico 4 Deployments · 0 Data Products
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