Using Sustainability Insights versus MeasureAPI

Integration of SI and Measure API for Emission Factor Quantification

Regrow’s customers use two primary products for EF quantification: SI, which is used to quantify supply shed EFs and Measure API, which is used to quantify field-level EFs after running MRV programs.

This guide ensures consistency and clarity in using and interpreting data from SI and the Measure API, acknowledging their the differences in methodologies and outputs. This document provides guidance for integrating field-level EFs into inventories alongside the supply shed EFs provided by SI and aims to:

Identify the 1-to-1 crosswalk between data outputs from SI and Measure API.
Detail the differences in how each product quantifies emission factors, noting variations in methodologies and metrics.
Explore methodologies for integrating field-level EFs into the broader supply shed EFs provided by SI.

Field Name	API Return	SI Return	API units	SI Units
Indirect N2O Emissions	Yes	No	tonne CO2e
Indirect N2O Emissions/unit area	Yes	Yes	tonne CO2e/ acre	tonne CO2e/ KG of Yield
Direct N2O Emissions	Yes	No	tonne CO2e
Direct N2O Emissions/unit area	Yes	Yes	tonne CO2e/ acre	tonne CO2e/ KG of Yield
Total N20 Emissions	Yes	No	tonne CO2e
Total N20 Emissions/unit area	Yes	Yes	tonne CO2e/ acre	tonne CO2e/ KG of Yield
Soil CH4 Emissions	Yes	No	tonne CO2e
Soil CH4 Emissions/unit area	Yes	Yes	tonne CO2e/ acre	tonne CO2e/ KG of Yield
SOC	Yes	No	tonne CO2e
SOC/unit area	Yes	Yes	tonne CO2e/ acre	tonne CO2e/ KG of Yield
Net carbon Impact/unit area	Yes	Yes	tonne CO2e/ acre	tonne CO2e/ KG of Yield
Field GHG emissions	Yes	No	tonne CO2e
Field GHG emissions factor	Yes	Yes	tonne CO2e/ bushel	KG CO2e/KG of Yield
Field SOC Emissions Factor	Yes	Yes	tonne CO2e/ bushel	KG CO2e/KG of Yield
Field Net Emissions Factor	Yes	Yes	tonne CO2e/ bushel	KG CO2e/KG of Yield
Fertilizer Emissions Factor (AR6)	No	Yes		KG CO2e/KG of yield
Potassium Fertilizer/unit area	No	Yes		tonne CO2e/ acre
Nitrogen Fertilizer/unit area	No	Yes		tonne CO2e/ acre
Phosphorus Fertilizer/unit area	No	Yes		tonne CO2e/ acre
Sulfur Fertilizer/unit area	No	Yes		tonne CO2e/ acre
Cover Crop Area	No	Yes		acres
No Cover Crop Area	No	Yes		acres
Cover Crop Unvalidated Area	No	Yes		acres
Conventional Till Area	No	Yes		acres
No Till Area	No	Yes		acres
Reduced Till Area	No	Yes		acres
Unvalidated Till Area	No	Yes		acres
Crop Yield/unit area	No	Yes		acres

Quantification Variance: Differences Between SI and API

The outputs from SI and API are quantified differently and should not be treated as direct replacements, especially at the field level. Key differences include:

Units of Measurement:
- SI: provides outputs in kg of yield
- API: provides outputs in bushels
Adjustments and Aggregation of DNDC Output:
- SI: starts with outcomes at the field level from the DNDC simulation and then aggregates these results to the subregion or supply shed level.
- API: processes DNDC output at the field level, uses uncertainty model per field to provide an uncertainty-adjusted value
  - Field-Level and Crop-Level Uncertainty Distribution: Measure provides uncertainty distributions at the crop level. This process includes:
    1. DNDC Simulation Outcomes: Starts with outcomes at the field level from the DNDC simulation.
    2. Apply Uncertainty Model: Implements an uncertainty model for each field.
    3. Field-Level Analysis: The above steps are conducted for every field.
    4. Crop-Specific Uncertainty: Sums the uncertainty distributions per outcome (GHG, SOC, etc.) across fields with the same crop to obtain a crop-specific uncertainty.
    5. Uncertainty-Adjusted Value: Derives an uncertainty-adjusted value from the distribution.
GHG and CO2 Equivalent Conversion Methodologies:
- SI: Recently updated its methodology to use the latest GHG conversion guidance, following the IPCC AR6 methodology.
- API: Continues to use the IPCC AR5 methodology for GHG conversion.