Fig. 2

Clusters in Pamekasan and Pasuruan by heatmap radius and cluster density. Cluster maps of Pamekasan (left) and Pasuruan (right) by heatmap radius and cluster density. Heatmap radius varies from 500 m (top row) to 2500 m (bottom row). The blue colour represents low density clusters (≥ 2), the orange colour represents moderate density clusters (≥ 5), and the green colour represents high density clusters (≥ 10)