The Certify API allows you to add measurement samples to your project.
Measurement samples are used to represent a set of physical measurements that you have taken of the carbon removal process.
For instance, these could be chemical analysis of soil, flue gas analyses or feedstock analyses.
Datapoints and measurement samples are closely related but measurement samples can contain many different values, whereas datapoints only contain one.
Whereas datapoints are only used in crediting calculations, measurement samples can be used in both crediting and in the data quality assessment.
A measurement sample can have multiple pieces of metadata associated with it, such as the date and time of the measurement, the location of the measurement and the measurement type .
The measurement type tells us what physical substance is being measured, such as soil, flue gas or feedstock.
Measurement types are specific to pathways, so you should look for measurement types that are specific to the pathway you are working with.
We currently support two pathways - enhanced weathering and biochar.
Each individual measurement in a sample has a property which describes the physical parameter being measured.
Measurement properties
A measurement property is made up of two parts - a quantity kind and a qualifier.
Each measurement type has an allowed list of measurement properties which are shown below.
Quantity kind
The quantity kind describes what physical parameter is being measured.
For example, mass fraction or temperature is a quantity kind.
The QuantityKind enum in the API schema lists all the possible quantity kinds.
Quantity kind is based around ideas from the QUDT project .
Qualifiers
Some properties need more information to fully describe the measurement than just the quantity kind.
In this case, we can add an extra qualifier to the property which tell us more about the measurement.
For instance, for a mass fraction quantity kind, we might add a qualifier to say that the measurement is a mass fraction of a specific element.
Measurement type reference
Enhanced weathering measurement types
Soil
Soil measurement properties
Property Quantity kind Qualifier Maximum depth DEPTH MAX_LIMIT Minimum depth DEPTH MIN_LIMIT Ca mass fraction MASS_FRACTION ELEMENT_CA K mass fraction MASS_FRACTION ELEMENT_K Mg mass fraction MASS_FRACTION ELEMENT_MG Na mass fraction MASS_FRACTION ELEMENT_NA Nb mass fraction MASS_FRACTION ELEMENT_NB Nd mass fraction MASS_FRACTION ELEMENT_ND Ta mass fraction MASS_FRACTION ELEMENT_TA Th mass fraction MASS_FRACTION ELEMENT_TH Ti mass fraction MASS_FRACTION ELEMENT_TI Y mass fraction MASS_FRACTION ELEMENT_Y Zr mass fraction MASS_FRACTION ELEMENT_ZR Soil Inorganic Carbon mass fraction MASS_FRACTION SOIL_INORGANIC_CARBON S mass fraction MASS_FRACTION ELEMENT_S pH ACIDITY — Bulk density BULK_DENSITY — Soil Organic Carbon mass fraction MASS_FRACTION SOIL_ORGANIC_CARBON clay mass fraction MASS_FRACTION CLAY sand mass fraction MASS_FRACTION SAND silt mass fraction MASS_FRACTION SILT C mass fraction MASS_FRACTION ELEMENT_C As mass fraction MASS_FRACTION ELEMENT_AS Ba mass fraction MASS_FRACTION ELEMENT_BA Cd mass fraction MASS_FRACTION ELEMENT_CD Co mass fraction MASS_FRACTION ELEMENT_CO Cr mass fraction MASS_FRACTION ELEMENT_CR Cu mass fraction MASS_FRACTION ELEMENT_CU Fe mass fraction MASS_FRACTION ELEMENT_FE Hg mass fraction MASS_FRACTION ELEMENT_HG Mn mass fraction MASS_FRACTION ELEMENT_MN Ni mass fraction MASS_FRACTION ELEMENT_NI Pb mass fraction MASS_FRACTION ELEMENT_PB Se mass fraction MASS_FRACTION ELEMENT_SE Tl mass fraction MASS_FRACTION ELEMENT_TL U mass fraction MASS_FRACTION ELEMENT_U V mass fraction MASS_FRACTION ELEMENT_V W mass fraction MASS_FRACTION ELEMENT_W Zn mass fraction MASS_FRACTION ELEMENT_ZN Loss on Ignition mass fraction MASS_FRACTION LOSS_ON_IGNITION P₂O₅ mass fraction MASS_FRACTION COMPOUND_P2O5 Al mass fraction MASS_FRACTION ELEMENT_AL Ce mass fraction MASS_FRACTION ELEMENT_CE Cs mass fraction MASS_FRACTION ELEMENT_CS La mass fraction MASS_FRACTION ELEMENT_LA Lu mass fraction MASS_FRACTION ELEMENT_LU P mass fraction MASS_FRACTION ELEMENT_P Rb mass fraction MASS_FRACTION ELEMENT_RB Sn mass fraction MASS_FRACTION ELEMENT_SN Tb mass fraction MASS_FRACTION ELEMENT_TB Yb mass fraction MASS_FRACTION ELEMENT_YB
Porewater
Porewater measurement properties
Property Quantity kind Qualifier Depth DEPTH — pH ACIDITY — Alkalinity MASS_CONCENTRATION ALKALINITY Cl⁻ mass fraction MASS_FRACTION ANION_CL_1MINUS NO₃⁻ mass fraction MASS_FRACTION ANION_NO3_1MINUS PO₄³⁻ mass fraction MASS_FRACTION ANION_PO4_3MINUS SO₄²⁻ mass fraction MASS_FRACTION ANION_SO4_2MINUS Ca mass fraction MASS_FRACTION ELEMENT_CA K mass fraction MASS_FRACTION ELEMENT_K Mg mass fraction MASS_FRACTION ELEMENT_MG Na mass fraction MASS_FRACTION ELEMENT_NA Nb mass fraction MASS_FRACTION ELEMENT_NB Nd mass fraction MASS_FRACTION ELEMENT_ND Ta mass fraction MASS_FRACTION ELEMENT_TA Th mass fraction MASS_FRACTION ELEMENT_TH Ti mass fraction MASS_FRACTION ELEMENT_TI Y mass fraction MASS_FRACTION ELEMENT_Y Zr mass fraction MASS_FRACTION ELEMENT_ZR Dissolved Inorganic Carbon MOLE_CONCENTRATION DISSOLVED_INORGANIC_CARBON CO₂ partial pressure PARTIAL_PRESSURE COMPOUND_CO2 Temperature TEMPERATURE — As mass fraction MASS_FRACTION ELEMENT_AS Ba mass fraction MASS_FRACTION ELEMENT_BA Cd mass fraction MASS_FRACTION ELEMENT_CD Co mass fraction MASS_FRACTION ELEMENT_CO Cr mass fraction MASS_FRACTION ELEMENT_CR Cu mass fraction MASS_FRACTION ELEMENT_CU Fe mass fraction MASS_FRACTION ELEMENT_FE Hg mass fraction MASS_FRACTION ELEMENT_HG Mn mass fraction MASS_FRACTION ELEMENT_MN Ni mass fraction MASS_FRACTION ELEMENT_NI Pb mass fraction MASS_FRACTION ELEMENT_PB Se mass fraction MASS_FRACTION ELEMENT_SE Tl mass fraction MASS_FRACTION ELEMENT_TL U mass fraction MASS_FRACTION ELEMENT_U V mass fraction MASS_FRACTION ELEMENT_V W mass fraction MASS_FRACTION ELEMENT_W Zn mass fraction MASS_FRACTION ELEMENT_ZN
Mineral feedstock
Mineral feedstock measurement properties
Property Quantity kind Qualifier CaO mass fraction MASS_FRACTION COMPOUND_CAO K₂O mass fraction MASS_FRACTION COMPOUND_K2O MgO mass fraction MASS_FRACTION COMPOUND_MGO Na₂O mass fraction MASS_FRACTION COMPOUND_NA2O P₂O₅ mass fraction MASS_FRACTION COMPOUND_P2O5 Ca mass fraction MASS_FRACTION ELEMENT_CA K mass fraction MASS_FRACTION ELEMENT_K Mg mass fraction MASS_FRACTION ELEMENT_MG Na mass fraction MASS_FRACTION ELEMENT_NA Ti mass fraction MASS_FRACTION ELEMENT_TI Zr mass fraction MASS_FRACTION ELEMENT_ZR Nb mass fraction MASS_FRACTION ELEMENT_NB Nd mass fraction MASS_FRACTION ELEMENT_ND Ta mass fraction MASS_FRACTION ELEMENT_TA Th mass fraction MASS_FRACTION ELEMENT_TH Y mass fraction MASS_FRACTION ELEMENT_Y H₂O mass fraction MASS_FRACTION COMPOUND_H2O Al mass fraction MASS_FRACTION ELEMENT_AL As mass fraction MASS_FRACTION ELEMENT_AS Ba mass fraction MASS_FRACTION ELEMENT_BA C mass fraction MASS_FRACTION ELEMENT_C Cd mass fraction MASS_FRACTION ELEMENT_CD Co mass fraction MASS_FRACTION ELEMENT_CO Cr mass fraction MASS_FRACTION ELEMENT_CR Cu mass fraction MASS_FRACTION ELEMENT_CU Fe mass fraction MASS_FRACTION ELEMENT_FE Hg mass fraction MASS_FRACTION ELEMENT_HG Mn mass fraction MASS_FRACTION ELEMENT_MN Mo mass fraction MASS_FRACTION ELEMENT_MO Ni mass fraction MASS_FRACTION ELEMENT_NI P mass fraction MASS_FRACTION ELEMENT_P Pb mass fraction MASS_FRACTION ELEMENT_PB S mass fraction MASS_FRACTION ELEMENT_S Se mass fraction MASS_FRACTION ELEMENT_SE Si mass fraction MASS_FRACTION ELEMENT_SI Sr mass fraction MASS_FRACTION ELEMENT_SR Tl mass fraction MASS_FRACTION ELEMENT_TL U mass fraction MASS_FRACTION ELEMENT_U V mass fraction MASS_FRACTION ELEMENT_V W mass fraction MASS_FRACTION ELEMENT_W Zn mass fraction MASS_FRACTION ELEMENT_ZN Bulk density BULK_DENSITY —
Biomass
Biomass measurement properties
Property Quantity kind Qualifier Al mass fraction MASS_FRACTION ELEMENT_AL As mass fraction MASS_FRACTION ELEMENT_AS B mass fraction MASS_FRACTION ELEMENT_B Ba mass fraction MASS_FRACTION ELEMENT_BA Ca mass fraction MASS_FRACTION ELEMENT_CA Cd mass fraction MASS_FRACTION ELEMENT_CD Co mass fraction MASS_FRACTION ELEMENT_CO Cr mass fraction MASS_FRACTION ELEMENT_CR Cu mass fraction MASS_FRACTION ELEMENT_CU Fe mass fraction MASS_FRACTION ELEMENT_FE Hg mass fraction MASS_FRACTION ELEMENT_HG K mass fraction MASS_FRACTION ELEMENT_K Mg mass fraction MASS_FRACTION ELEMENT_MG Mn mass fraction MASS_FRACTION ELEMENT_MN Mo mass fraction MASS_FRACTION ELEMENT_MO Na mass fraction MASS_FRACTION ELEMENT_NA Ni mass fraction MASS_FRACTION ELEMENT_NI P mass fraction MASS_FRACTION ELEMENT_P Pb mass fraction MASS_FRACTION ELEMENT_PB S mass fraction MASS_FRACTION ELEMENT_S Se mass fraction MASS_FRACTION ELEMENT_SE Si mass fraction MASS_FRACTION ELEMENT_SI Ti mass fraction MASS_FRACTION ELEMENT_TI Zn mass fraction MASS_FRACTION ELEMENT_ZN
Ion exchange resin
Ion exchange resin measurement properties
Property Quantity kind Qualifier NO₃⁻ AMOUNT_OF_SUBSTANCE_PER_MASS ANION_NO3_1MINUS PO₄³⁻ AMOUNT_OF_SUBSTANCE_PER_MASS ANION_PO4_3MINUS SO₄²⁻ AMOUNT_OF_SUBSTANCE_PER_MASS ANION_SO4_2MINUS Ca mass fraction MASS_FRACTION ELEMENT_CA Co mass fraction MASS_FRACTION ELEMENT_CO Cr mass fraction MASS_FRACTION ELEMENT_CR K mass fraction MASS_FRACTION ELEMENT_K Mg mass fraction MASS_FRACTION ELEMENT_MG Na mass fraction MASS_FRACTION ELEMENT_NA Ni mass fraction MASS_FRACTION ELEMENT_NI
Biochar measurement types
Production batch
Production batch measurement properties
Property Quantity kind Qualifier pH ACIDITY — Dissolved Inorganic Carbon AMOUNT_OF_SUBSTANCE_PER_MASS DISSOLVED_INORGANIC_CARBON Mass MASS — Fixed Carbon mass fraction (dry basis) MASS_FRACTION_DRY_BASIS FIXED_CARBON Total Inorganic Carbon mass fraction (dry basis) MASS_FRACTION_DRY_BASIS TOTAL_INORGANIC_CARBON H₂O mass fraction (dry basis) MASS_FRACTION_DRY_BASIS COMPOUND_H2O As mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_AS C mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_C Cd mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_CD Co mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_CO Cr mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_CR Cu mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_CU H mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_H Hg mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_HG K mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_K Ni mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_NI O mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_O P mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_P Pb mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_PB Sb mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_SB V mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_V Zn mass fraction (dry basis) MASS_FRACTION_DRY_BASIS ELEMENT_ZN Fixed Carbon mass fraction (wet basis) MASS_FRACTION_WET_BASIS FIXED_CARBON Total Inorganic Carbon mass fraction (wet basis) MASS_FRACTION_WET_BASIS TOTAL_INORGANIC_CARBON H₂O mass fraction (wet basis) MASS_FRACTION_WET_BASIS COMPOUND_H2O As mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_AS C mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_C Cd mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_CD Co mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_CO Cr mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_CR Cu mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_CU H mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_H Hg mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_HG K mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_K Ni mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_NI O mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_O P mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_P Pb mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_PB Sb mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_SB V mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_V Zn mass fraction (wet basis) MASS_FRACTION_WET_BASIS ELEMENT_ZN
Soil
Soil measurement properties
Property Quantity kind Qualifier pH ACIDITY — Bulk density BULK_DENSITY — clay mass fraction MASS_FRACTION CLAY sand mass fraction MASS_FRACTION SAND silt mass fraction MASS_FRACTION SILT Soil Organic Carbon mass fraction (dry basis) MASS_FRACTION_DRY_BASIS SOIL_ORGANIC_CARBON H₂O mass fraction (dry basis) MASS_FRACTION_DRY_BASIS COMPOUND_H2O Soil Organic Carbon mass fraction (wet basis) MASS_FRACTION_WET_BASIS SOIL_ORGANIC_CARBON H₂O mass fraction (wet basis) MASS_FRACTION_WET_BASIS COMPOUND_H2O Temperature TEMPERATURE —