How are the spatial risk scores calculated?
Using the example of deforestation risks related to coffee and beef production in Colombia, the methodology below explains how spatial risk scores are developed at national and subnational level.
Step 1. Collecting theme-specific data We start by selecting relevant public data sources for each theme: biodiversity loss, deforestation and water stress. The methodology is based on secondary data from independent third-party sources.
Step 2. Processing the data Before we analyse the data, we prepare the datasets so they can be compared. This includes cleaning and filtering the data and converting them to the same spatial resolution. Spatial resolution refers to the smallest area on the ground that a dataset can reliably represent.
Because the original datasets differ in format and level of detail, we standardise all data sources to global coverage and a resolution of approximately 1 × 1 km.
Step 3. Overlaying and aggregating spatial data We then overlay the theme-specific information with data on commodity production patterns. This allows us to calculate risk scores for the production area of each commodity.
We aggregate the results to the highest level of subnational administrative divisions, known as ADM1, such as states in the USA. For each subnational unit, we calculate the share of land that falls into each risk class, ranging from very low to very high.
Step 4. Determining the final risk scores We determine the final risk score by calculating a weighted average of the share of land in each risk class. Harvested area is used as the weighting factor, so areas with more commodity production have a stronger influence on the final score.
This gives us a risk score for each commodity and subnational unit. We also calculate a national risk score by weighting the subnational results according to each unit’s share of the national harvested area.
Each score is scaled from 0, indicating no risk, to 5, indicating high risk.
Spatial methodology infographic Download the infographic(externe link) for a visual overview of the spatial methodology.
Download full methodology Looking for the complete LCA and spatial methodology, datasets, and technical documentation? Download the full environmental risks methodology(externe link).
FAQ