# data[].attributes.definition
The amount of radiation absorbed by a material

# data[].attributes.definition
Absorbance of ultraviolet light at a specified wavelength, typically at 254 or 280 nm for water samples. Not normalized to DOC concentration like variables such as SUVA280.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
The relative representation of a species in a particular ecosystem. If this generic term is used, the publisher should specify/qualify the species, class, etc. being measured in the method, qualifier, or other appropriate field.

# data[].attributes.definition
The relative representation of a species in a particular ecosystem. If this generic term is used, the publisher should specify/qualify the species, class, etc. being measured in the method, qualifier, or other appropriate field.

# data[].attributes.definition
Alluvium is loose, unconsolidated (not cemented together into a solid rock) soil or sediment that has been eroded, reshaped by water in some form, and redeposited in a non-marine setting. Alluvium is typically made up of a variety of materials, including fine particles of silt and clay and larger particles of sand and gravel. When this loose alluvial material is deposited or cemented into a lithological unit, or lithified, it is called an alluvial deposit.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Basal area is the area of a given section of land that is occupied by the cross-section of tree trunks and stems at the base. The term is used in forest management and forest ecology.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Aspect identifies the downslope direction of the maximum rate of change in value from each raster DEM cell to its neighbors.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
The portion of streamflow (discharge) that is supplied by groundwater sources.

# data[].attributes.definition
Percent base saturation (BS) is the percentage of the Cation Exchange Capacity (CEC) occupied by the basic cations Ca2+, Mg2+ and K+.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
The battery temperature of a datalogger or sensing system

# data[].attributes.definition
In geology, bedrock is the lithified rock that lies under a loose softer material called regolith at the surface of the Earth or other terrestrial planets.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Mass of living biological organisms in a given area or ecosystem at a given time. If this generic term is used, the publisher should specify/qualify the species, class, etc. being measured in the method, qualifier, or other appropriate field.

# data[].attributes.definition
The biomass is the mass of living biological organisms in a given area or ecosystem at a given time on or above the surface of the ground

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Microbial biomass (bacteria and fungi) is a measure of the mass of the living component of soil organic matter.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Total mass of phytoplankton, per unit area or volume

# data[].attributes.term
Biomass, soil bacterial deoxyribonucleic acid (DNA)

# data[].attributes.definition
Total dry mass of soil bacterial deoxyribonucleic acid (DNA) per unit mass of soil

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Total dry mass of plant material per unit area or volume

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Blue-green algae (cyanobacteria) with phycocyanin pigments

# data[].attributes.definition
Classification of material encountered by a driller at various depths during the drilling of a well and recorded in the borehole log.

# data[].attributes.definition
The mass of many particles of the material divided by the total volume they occupy. The total volume includes particle volume, inter-particle void volume and internal pore volume.

# data[].attributes.definition
Bulk electrical conductivity of a medium measured using a sensor such as time domain reflectometry (TDR), as a raw sensor response in the measurement of a quantity like soil moisture.

# data[].attributes.definition
Crown closure is a term used in forestry. Crown closure and crown cover are two slightly different measures of the forest canopy and that determine the amount of light able to penetrate to the forest floor.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Forest canopy density and height are used as variables in a number of environmental applications, such as biomass estimation, vegetation coverage, and biodiversity determination. Canopy density, or canopy cover, is the ratio of vegetation to ground as seen from the air. Canopy height measures how far above the ground the top of the canopy is. Lidar can be used to determine both of these variables.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
In geometry, the circumference (from Latin circumferens, meaning "carrying around") of a circle is the (linear) distance around it. That is, the circumference would be the length of the circle if it were opened up and straightened out to a line segment. Since a circle is the edge (boundary) of a disk, circumference is a special case of perimeter. The perimeter is the length around any closed figure and is the term used for most figures excepting the circle and some circular-like figures such as ellipses. Informally, "circumference" may also refer to the edge itself rather than to the length of the edge.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
USDA particle size distribution category. Less then 0.002 mm diameter fine earth particles. 

# data[].attributes.definition
The identifying number for a water sampler container.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
The total number of events within the measurement period

# data[].attributes.definition
Curvature of a DEM measures the shape or curvature of the slope. A part of a surface can be concave or convex; you can tell that by looking at the curvature value. The curvature is calculated by computing the second derivative of the surface.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
The perpendicular measurement downward from a surface

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Depth of the Unsaturated zone. The vadose zone, also termed the unsaturated zone, is the part of Earth between the land surface and the top of the phreatic zone, the position at which the groundwater (the water in the soil's pores) is at atmospheric pressure ("vadose" is from the Latin for "shallow"). Hence, the vadose zone extends from the top of the ground surface to the water table.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
A diameter of a circle is any straight line segment that passes through the center of the circle and whose endpoints lie on the circle. It can also be defined as the longest chord of the circle. Both definitions are also valid for the diameter of a sphere. In more modern usage, the length of a diameter is also called the diameter. In this sense one speaks of the diameter rather than a diameter (which refers to the line itself), because all diameters of a circle or sphere have the same length, this being twice the radius r.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Diameter at breast height, or DBH, is the standard for measuring trees. DBH refers to the tree diameter measured at 4.5 feet above the ground.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
The relative permittivity of a material is its (absolute) permittivity expressed as a ratio relative to the permittivity of vacuum. Permittivity is a material property that affects the Coulomb force between two point charges in the material. Relative permittivity is the factor by which the electric field between the charges is decreased relative to vacuum. Likewise, relative permittivity is the ratio of the capacitance of a capacitor using that material as a dielectric, compared with a similar capacitor that has vacuum as its dielectric. Relative permittivity is also commonly known as dielectric constant, a term deprecated in engineering as well as in chemistry.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Distance measured from a sensor to a target object such as the surface of a water body or snow surface.

# data[].attributes.definition
In earth science, erosion is the action of surface processes (such as water flow or wind) that removes soil, rock, or dissolved material from one location on the Earth's crust, and then transports it to another location (not to be confused with weathering which involves no movement).

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Evapotranspiration is the sum of evaporation and plant transpiration from the Earth's land and ocean surface to the atmosphere.

# data[].attributes.definition
The amount of water that could be evaporated and transpired if there was sufficient water available.

# data[].attributes.definition
Number of rotations within a time period

# data[].attributes.definition
Water level with regard to an arbitrary gage datum (also see Water depth for comparison)

# data[].attributes.definition
Geologic units consists primarily of identifying physiographic units and determining the rock lithology or coarse stratigraphy of exposed units.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Grain size (or particle size) is the diameter of individual grains of sediment, or the lithified particles in clastic rocks. The term may also be applied to other granular materials.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
The combination effect of heat and humidity on the temperature felt by people.

# data[].attributes.definition
Height is measure of vertical distance, either vertical extent or vertical position

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Vertical distance from the sea floor to a point.

# data[].attributes.definition
Humification index. Hummification is the processes by which organic matter decomposes to form humus. In humus the initial structures or shapes can no longer be recognized. See also humus.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Hydraulic conductivity, symbolically represented as K, is a property of vascular plants, soils and rocks, that describes the ease with which a fluid (usually water) can move through pore spaces or fractures. It depends on the intrinsic permeability of the material, the degree of saturation, and on the density and viscosity of the fluid.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Hydraulic conductivity, symbolically represented as K, is a property of vascular plants, soils and rocks, that describes the ease with which a fluid (usually water) can move through pore spaces or fractures. It depends on the intrinsic permeability of the material, the degree of saturation, and on the density and viscosity of the fluid.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Hydraulic conductivity, symbolically represented as K, is a property of vascular plants, soils and rocks, that describes the ease with which a fluid (usually water) can move through pore spaces or fractures. It depends on the intrinsic permeability of the material, the degree of saturation, and on the density and viscosity of the fluid.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Difference in the 2H:1H ratio between the sample and standard

# data[].attributes.definition
Difference in the 2H:1H ratio between the sample and standard

# data[].attributes.definition
Binary status to indicate the status of an instrument or other piece of equipment.

# data[].attributes.definition
Code value recorded by instrument indicating some information regarding the status of the instrument

# data[].attributes.definition
Geographical land classification- genetically homogeneous territorial unit within natural boundaries with a certain structure and a certain character of interrelationships of considered components

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Leaf area index (LAI) is a dimensionless quantity that characterizes plant canopies. It is defined as the one-sided green leaf area per unit ground surface area (LAI = leaf area / ground area, m2 / m2) in broadleaf canopies.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
The effect of moisture settling on the surface of a leaf as a result of either condensation or rainfall.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Litterfall, plant litter, leaf litter, tree litter, soil litter, or duff, is dead plant material (such as leaves, bark, needles, twigs, and cladodes) that have fallen to the ground.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
The suspended load of a flow of fluid, such as a river, is the portion of its sediment uplifted by the fluid's flow in the process of sediment transportation. It is kept suspended by the fluid's turbulence. The suspended load generally consists of smaller particles, like clay, silt, and fine sands.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
A counter of the number of times the battery voltage dropped below a minimum threshold

# data[].attributes.definition
Langelier Saturation Index is an indicator of the degree of saturation of water with respect to calcium carbonate

# data[].attributes.definition
Langelier Saturation Index is an indicator of the degree of saturation of water with respect to calcium carbonate

# data[].attributes.definition
The organic matter component of a complex material.

# data[].attributes.definition
Parameter related to a hydrologic process. An example usage would be for a stage-discharge relation parameter.

# data[].attributes.definition
The percent of full scale for an instrument

# data[].attributes.definition
Measurement of phytoplankton with no differentiation between species

# data[].attributes.definition
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%.

# data[].attributes.definition
Position of an element that interacts with water such as reservoir gates

# data[].attributes.definition
Rate at which an ecosystem accumulates energy by fixation of sunlight, including that consumed by the ecosystem.

# data[].attributes.definition
Total amount of outgoing radiation from all frequencies

# data[].attributes.definition
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.

# data[].attributes.note
Reused Real dielectric constant (Surface water): https://sms-cv.helmholtz.cloud/sms/cv/api/v1/measuredquantities/269/ 
Can also be measured in Soil (e.g. with Stevens HydraProbe sensor)

# data[].attributes.definition
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.

# data[].attributes.definition
In telecommunications, received signal strength indicator (RSSI) is a measurement of the power present in a received radio signal.

# data[].attributes.definition
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.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
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.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases.

# data[].attributes.definition
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.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
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.

# data[].attributes.definition
USDA particle size distribution category. 0.5 to 2 mm diameter fine earth particles. 

# data[].attributes.definition
The amount of sediment passing a sieve in a gradation test

# data[].attributes.definition
The amount of sediment retained on a sieve in a gradation test

# data[].attributes.definition
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.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
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.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
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.

# data[].attributes.definition
USDA particle size distribution category. 0.002 to 0.5 mm diameter fine earth particles. 

# data[].attributes.definition
Ratio between two variables in a linear relationship.

# data[].attributes.definition
Snow layers within the snowpack are a record of the winter’s weather. Like tree rings or strata of rock, layers can be traced to dates and conditions that formed them. One of the most important characteristics of a layer is its hardness. Harder snow is stronger and cohesive, while softer snow is weaker. 

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
The depth of water if a snow cover is completely melted, expressed in units of depth, on a corresponding horizontal surface area.

# data[].attributes.definition
Soil aggregate stability is a measure of the ability of soil aggregates to resist degradation when exposed to external forces such as water erosion and wind erosion, shrinking and swelling processes, and tillage. Soil aggregate stability is a measure of soil structure and can be impacted by soil management.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
For soil resources, experience has shown that a natural system approach to classification, i.e. grouping soils by their intrinsic property (soil morphology), behaviour, or genesis, results in classes that can be interpreted for many diverse uses. Differing concepts of pedogenesis, and differences in the significance of morphological features to various land uses can affect the classification approach.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Fraction of particles within a soil sample that are greater that 2mm in diameter

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
A soil horizon is a layer parallel to the soil surface, whose physical characteristics differ from the layers above and beneath. Each soil type usually has three or four horizons.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Soil organic matter (SOM) is the organic matter component of soil, consisting of plant and animal residues at various stages of decomposition, cells and tissues of soil organisms, and substances synthesized by soil organisms.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.term
Soil organic matter (SOM) density fractionation

# data[].attributes.definition
Density fraction of Soil organic matter (SOM) in soil. Soil organic matter (SOM) is the organic matter component of soil, consisting of plant and animal residues at various stages of decomposition, cells and tissues of soil organisms, and substances synthesized by soil organisms.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Soil respiration refers to the production of carbon dioxide when soil organisms respire. This includes respiration of plant roots, the rhizosphere, microbes and fauna.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Soil texture is a classification instrument used both in the field and laboratory to determine soil classes based on their physical texture. Soil texture can be determined using qualitative methods such as texture by feel, and quantitative methods such as the hydrometer method.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Count of unique taxa. A taxon (plural: taxa) is a group of one (or more) populations of organism(s), which is judged to be a unit.

# data[].attributes.definition
Time domain reflextometry, apparent length divided by probe length. Square root of dielectric

# data[].attributes.definition
The THSW Index uses temperature, humidity, solar radiation, and wind speed to calculate an apparent temperature.

# data[].attributes.definition
The THW Index uses temperature, humidity, and wind speed to calculate an apparent temperature.

# data[].attributes.definition
Topographic wetness index (TWI), also known as the compound topographic index (CTI), is a steady state wetness index. It is commonly used to quantify topographic control on hydrological processes.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
The difference between the actual water vapor pressure and the saturation of water vapor pressure at a particular temperature.

# data[].attributes.definition
Vegetation is an assemblage of plant species and the ground cover they provide.

# data[].attributes.note
Added to support Critical Zone Observatory (CZO) data use cases. 

# data[].attributes.definition
Volume. To quantify discharge or hydrograph volume or some other volume measurement.

# data[].attributes.definition
A counter which counts the number of total datalogger watchdog errors

# data[].attributes.term
Water column equivalent height, absolute

# data[].attributes.definition
The absolute pressure (combined water + barometric) on a sensor expressed as the height of an equivalent column of water.

# data[].attributes.term
Water column equivalent height, barometric

# data[].attributes.definition
Barometric pressure expressed as an equivalent height of water over the sensor.

# data[].attributes.definition
Water depth averaged over a channel cross-section or water body.  Averaging method to be specified in methods.

# data[].attributes.definition
Water potential is the potential energy of water relative to pure free water (e.g. deionized water) in reference conditions. It quantifies the tendency of water to move from one area to another due to osmosis, gravity, mechanical pressure, or matrix effects including surface tension.

# data[].attributes.definition
Water potential is the potential energy of water relative to pure free water (e.g. deionized water) in reference conditions. It quantifies the tendency of water to move from one area to another due to osmosis, gravity, mechanical pressure, or matrix effects including surface tension.

# data[].attributes.note
Reused Water potential (Surface water): https://sms-cv.helmholtz.cloud/sms/cv/api/v1/measuredquantities/330/
Can also be measured in soils as information for e.g. plant physiology.

# data[].attributes.term
Water Use, Commercial + Industrial + Power

# data[].attributes.definition
Water pumped by commercial, industrial users.

# data[].attributes.definition
Water pumped by domestic wells; residents and landowners not using public supply. Nonagriculture wells.

# data[].attributes.definition
Recreational water use, for example golf courses.

# data[].attributes.definition
The height of a surface wave, measured as the difference in elevation between the wave crest and an adjacent trough.

# data[].attributes.definition
The pressure exerted by the fluid at the wellhead or casinghead after the well has been shut off for a period of time, typically 24 hours

# data[].attributes.definition
The effect of wind on the temperature felt on human skin.

# data[].attributes.definition
The direction of the air (absolute) in the atmosphere (from direction). Wind direction 0…360°, where 0° is north. Please note a different reference direction in the sensor description. Default min/max values according to WMO quality control Guidelines.

# data[].attributes.definition
The length of flow of air past a point over a time interval. Windspeed times the interval of time.

# data[].attributes.definition
Drag or trangential force per unit area exerted on a surface by the adjacent layer of moving air