Editing Soil moisture content (section)

== Monitoring and Measurement ==
Soil moisture content is monitored through a combination of in situ measurements, remote sensing technologies, and modeling approaches. Ground-based sensors, such as time-domain reflectometry probes and neutron scattering instruments, provide localized, high-frequency soil moisture data. These measurements are essential for calibration and validation of remote sensing products.

Satellite missions, including those from the European Space Agency (ESA) Climate Change Initiative (CCI), utilize microwave radiometry and radar to estimate surface soil moisture globally. These spaceborne observations offer broad spatial coverage and frequent revisit times, enabling continuous monitoring of soil moisture dynamics. Data assimilation techniques integrate observations with land surface models to produce gap-filled, consistent soil moisture datasets.

Scientific institutions and agencies worldwide contribute to soil moisture monitoring efforts, supporting applications in hydrology, agriculture, and climate research.

Within the SIGNAL system, soil moisture content is treated as a defined environmental signal whose boundaries and measurement conventions are described below.