Vector fields as a framework for modelling the mobility of commodities
Fig 4
Entropy of monthly vectors for (A) municipalities and (B) micro-regions.
Monthly vectors are classified into four directional clusters by dividing the Cartesian plane into four quadrants, each assigned a distinct value (1–4). Shannon entropy is then calculated from these 12 cluster values to yield a single entropy measure per municipality or micro-region, which is colour-coded on the map to indicate the diversity of commodity flow directions over the year. For visualisation, entropy values are normalised using Min–Max normalisation. The base maps used in this figure are freely available and not subject to copyright (Panel A: [34]; Panel B: [35]).