Snow influences the land-surface water budget. Snow measurements are needed both to study climate and to predict drought, flooding, and water availability.
Monitoring changes in vegetation is important for climate and hydrologic modeling applications, validation of satellite estimates of land surface conditions, and testing of ecohydrological hypotheses.
Soil moisture affects the partitioning of precipitation into runoff, evapotranspiration and deep drainage and the fluxes of energy and carbon between the land surface and atmosphere.
Reflected GPS signals are sensitive to snow, soil moisture, and vegetation. The PBO H2O Data Portal makes hydrologic products based on GPS data available directly through your web browser. For more information on how these environmental products were created and for tutorials on how to retrieve data, please see the portal documentation.