Term Definition Status
Organic matter The organic matter component of a complex material. ACCEPTED
Orientation Azimuth orientation of sensor platform ACCEPTED
Oscillation period - ACCEPTED
Osmotic pressure - ACCEPTED
Ozone Ozone (O3) ACCEPTED
PAR albedo Quotient betbeen PAR radiation In and PAR radiation Out (Reflected). ACCEPTED
Parameter Parameter related to a hydrologic process. An example usage would be for a stage-discharge relation parameter. ACCEPTED
particle size Particle size is a notion introduced for comparing dimensions of solid particles (flecks), liquid particles (droplets), or gaseous particles (bubbles). The notion of particle size applies to particles in colloids, in ecology, in granular material (whether airborne or not), and to particles that form a granular material (see also grain size). ACCEPTED
Particulate matter 10 Coarse particles with a diameter between 2.5 and 10 μm. ACCEPTED
Particulate matter 2.5 Fine particles with a diameter of 2.5 μm or less. ACCEPTED
Percent full scale The percent of full scale for an instrument ACCEPTED
pH pH value ACCEPTED
Phosphorus total Total Phosphorus ACCEPTED
Phytoplankton Measurement of phytoplankton with no differentiation between species ACCEPTED
Porosity Porosity or void fraction is a measure of the void (i.e. "empty") spaces in a material, and is a fraction of the volume of voids over the total volume, between 0 and 1, or as a percentage between 0 and 100%. ACCEPTED
Position Position of an element that interacts with water such as reservoir gates ACCEPTED
Position of sun, azimut - ACCEPTED
Position of sun, elevation - ACCEPTED
Potential temperature - ACCEPTED
Precipitation accumulation, hail - ACCEPTED
Precipitation duration, hail - ACCEPTED
Precipitation duration, liquid - ACCEPTED
Precipitation event Binary value which distinguishes between no precipitation (0) and precipitation (1). ACCEPTED
Precipitation height, liquid Precipitation height, the liquid portion of the precipitation. Default min/max values valid for minute-values according to WMO quality control Guidelines. ACCEPTED
Precipitation height, snow Precipitation height, the snow portion of the precipitation. ACCEPTED
Precipitation height, snow equivalent Precipitation height, the snow-equivalent portion of the precipitation. This it the amount of water in mm which you get by melting snow with known heigt and density. ACCEPTED
Precipitation height, total Precipitation height, total sum of rain, snow, hail. Please note if the device is heated. Values are quasi real-time with heating. Without heating, values are not real time. ACCEPTED
Precipitation intensity, hail Precipitation intensity, the hail portion of the precipitation. ACCEPTED
Precipitation intensity, liquid Precipitation intensity, the liquid portion of the precipitation. Default min/max values valid for minute-values according to WMO quality control Guidelines. ACCEPTED
Precipitation intensity, total Precipitation intensity, total sum of rain, snow, hail. Please note if the device is heated. Values are quasi real-time with heating. Without heating, values are not real time. ACCEPTED
Precipitation particle speed Mean velocity of particles within one specific particle size class. ACCEPTED
Precipitation type Coded value for the type of precipitation. Please note the type of sensor to enable the decoding. ACCEPTED
Pressure, absolute Operating parameter of a device. Absolute pressure. ACCEPTED
Pressure head c.f. matrix potential. E.g. Tensiometer. ACCEPTED
Pressure, relative Operating parameter of a device. Relative pressure. ACCEPTED
Primary productivity Primary Productivity ACCEPTED
Primary productivity, gross Rate at which an ecosystem accumulates energy by fixation of sunlight, including that consumed by the ecosystem. ACCEPTED
Pump quantity Quantity of a fluid whicht is pumped. ACCEPTED
Quality flag Please note in the sensor description to which value the quality flag belongs and what it means. ACCEPTED
Radar correlation coefficient RhoHV Correlation coefficient (also referred to as ρhv or rho) provides a measure of the consistency of the shapes and sizes of targets within the radar beam. A higher value shows a higher consistency in the size and shape of radar targets, while a lower value indicates greater variability in shapes and sizes. Definition from US National Weather Service naming according to WMO-CF extensions (https://community.wmo.int/en/activity-areas/wis/wmo-cf-extensions) ACCEPTED
radar reflectivity a measure of the efficiency of a radar target in intercepting and returning radio energy REJECTED
Radar specific differential phase hv Specific Differential Phase (KDP) is a derived product that shows the gradient, or change, in Differential Phase Shift (ΦDP). Positive KDP values indicate greater phase shift in the horizontal than the vertical. Increasing KDP is an indication of an increase in the size and concentration of rain drops, and thus, an increase in rain rate. This means that KDP is useful for pinpointing areas where the heaviest rainfall is occurring. naming accoring to WMO CF-extension Radial ACCEPTED
Radial velocity of scatterers, away from instrument A velocity is a vector quantity. "Radial velocity away from instrument" means the component of the velocity along the line of sight of the instrument where positive implies movement away from the instrument (i.e. outward). The "instrument" (examples are radar and lidar) is the device used to make the observation. The "scatterers" are what causes the transmitted signal to be returned to the instrument (examples are aerosols, hydrometeors and refractive index irregularities), of whatever kind the instrument detects. A standard name referring to radial velocity "toward_instrument" should be used for a data variable having the opposite sign convention. ACCEPTED
Radial velocity of scatterers, towards instrument A velocity is a vector quantity. "Radial velocity toward instrument" means the component of the velocity along the line of sight of the instrument where positive implies movement toward the instrument (i.e. inward). The "instrument" (examples are radar and lidar) is the device used to make the observation. The "scatterers" are what causes the transmitted signal to be returned to the instrument (examples are aerosols, hydrometeors and refractive index irregularities), of whatever kind the instrument detects. A standard name referring to radial velocity "away_from_instrument" should be used for a data variable having the opposite sign convention. ACCEPTED
Radiance Reflected light/radiation from ground area per wavelength. ACCEPTED
Radiation FIR, in Long wave (far infrared) downward facing radiation ACCEPTED
Radiation FIR, out Long wave (far infrared) upward facing radiation ACCEPTED
Radiation, incoming longwave Incoming Longwave Radiation ACCEPTED
Radiation, incoming shortwave Incoming Shortwave Radiation ACCEPTED
Radiation, incoming UV-A Incoming Ultraviolet A Radiation ACCEPTED
Radiation, incoming UV-B Incoming Ultraviolet B Radiation ACCEPTED
Radiation IR, in Downward facing longwave/infrared radiation ACCEPTED
Radiation IR, out Upward facing longwave/infrared radiation ACCEPTED
Radiation, net longwave Net Longwave Radiation ACCEPTED
Radiation, net PAR Net Photosynthetically-Active Radiation ACCEPTED
Radiation, net shortwave Net shortwave radiation ACCEPTED
Radiation, net total Net total radiation ACCEPTED
Radiation, outgoing longwave Outgoing Longwave Radiation ACCEPTED
Radiation, outgoing shortwave Outgoing Shortwave Radiation ACCEPTED
Radiation PAR, in Photosynthetically Active Radiation downward ACCEPTED
Radiation PAR, out Photosynthetically Active Radiation upward ACCEPTED
Radiation PPFD, in Photosynthetic photon flux density downward ACCEPTED
Radiation PPFD, out Photosynthetic photon flux density upward ACCEPTED
Radiation PPFD scattered, in Diffuse photosynthetic photon flux density ACCEPTED
Radiation, scattered Diffuse global radiation ACCEPTED
Radiation, total, in Total radiation downward ACCEPTED
Radiation, total outgoing Total amount of outgoing radiation from all frequencies ACCEPTED
Radiation, total shortwave Total Shortwave Radiation ACCEPTED
Raw measurement data - PENDING
Real dielectric constant Soil reponse of a reflected standing electromagnetic wave of a particular frequency which is related to the stored energy within the medium. This is the real portion of the complex dielectric constant. ACCEPTED
Received signal strength indication In telecommunications, received signal strength indicator (RSSI) is a measurement of the power present in a received radio signal. ACCEPTED
Recharge, groundwater Groundwater recharge or deep drainage or deep percolation is a hydrologic process where water moves downward from surface water to groundwater. Recharge is the primary method through which water enters an aquifer. This process usually occurs in the vadose zone below plant roots and is often expressed as a flux to the water table surface. Recharge occurs both naturally (through the water cycle) and through anthropogenic processes (i.e., "artificial groundwater recharge"), where rainwater and or reclaimed water is routed to the subsurface. ACCEPTED
Redoxpotential - ACCEPTED
Reduction potential Oxidation-reduction potential ACCEPTED
Reflectivity dBZ stands for decibel relative to Z. It is a logarithmic dimensionless technical unit used in radar, mostly in weather radar, to compare the equivalent reflectivity factor (Z) of a radar signal reflected off a remote object (in mm6 per m3) to the return of a droplet of rain with a diameter of 1 mm (1 mm6 per m3). It is proportional to the number of drops per unit volume and the sixth power of drops' diameter and is thus used to estimate the rain or snow intensity. ACCEPTED
Relative humidity The ratio of the amount of water vapour in the air compared to the maximum amount of water vapour that can theoretically be held at the air's temperature. ACCEPTED
Relative humidity, data logger Operating parameter of a data logger. Relative humidity of a data logger. ACCEPTED
Relative humidity, device Operating parameter of a data logger. Relative humidity of a device. ACCEPTED
Relative permittivity - ACCEPTED
Reservoir storage Reservoir water volume ACCEPTED
Resistivity, electrical The electrical resistance of an object is a measure of its opposition to the flow of electric current. The inverse quantity is electrical conductance, and is the ease with which an electric current passes. ACCEPTED
Respiration, ecosystem Gross carbon dioxide production by all organisms in an ecosystem. Ecosystem respiration is the sum of all respiration occurring by the living organisms in a specific ecosystem. ACCEPTED
Respiration, net Net respiration ACCEPTED
Runtime Operating hours counter or runtime of a device or logger (e.g. pump). ACCEPTED
Salinity - ACCEPTED
Sand USDA particle size distribution category. 0.5 to 2 mm diameter fine earth particles. ACCEPTED
Sap flow - ACCEPTED
Saturation oxygen - ACCEPTED
Saturation oxygen - ACCEPTED
Sediment, passing sieve The amount of sediment passing a sieve in a gradation test ACCEPTED
Sediment, retained on sieve The amount of sediment retained on a sieve in a gradation test ACCEPTED
Sediment, suspended Suspended Sediment ACCEPTED
Seismic refraction Seismic refraction is a geophysical principle (see refraction) governed by Snell's Law. Used in the fields of engineering geology, geotechnical engineering and exploration geophysics, seismic refraction traverses (seismic lines) are performed using a seismograph(s) and/or geophone(s), in an array and an energy source. ACCEPTED
Sensible heat flux Sensible Heat Flux ACCEPTED
Sigma-t Density of seawater calculated with in situ salinity and temperature, but pressure equal to zero, rather than the in situ pressure, and 1000 kg/m^3 is subtracted. Defined as (S,T)-1000 kg m-3, where (S,T) is the density of a sample of seawater at temperature T and salinity S, measured in kg m-3, at standard atmospheric pressure. ACCEPTED
Signal quality Internal signature measurent quality ACCEPTED
Signal quality index A value between 0 ... 1 that measures the signal's Doppler coherency, that is the correlation between the signal and its Doppler lag. 0 indicates white noise 1 is the perfect Doppler point target PENDING
Signal to noise ratio Signal-to-noise ratio (often abbreviated SNR or S/N) is defined as the ratio of a signal power to the noise power corrupting the signal. The higher the ratio, the less obtrusive the background noise is. ACCEPTED
Silt USDA particle size distribution category. 0.002 to 0.5 mm diameter fine earth particles. ACCEPTED
Slope Ratio between two variables in a linear relationship. ACCEPTED