Figure 4

Loading into FGBASE a data set of spatial entities grouped into classes: the IREP factories grouped by chemical emissions. The spatial entities (IREP factories) are loaded in the FGBASE software and displayed on the interactive map. These entities are grouped into classes based on the chemicals which they have emitted (an entity can be assigned to several classes). The hypothesis driven algorithm tests each class of entities, one after the other, by reading from the grid the number of cases and controls at several different levels of proximity from entities in that class.