Figure 2
From: Improved coverage in WSNs by exploiting spatial correlation: the two sensor case
Graphical representation (not drawn to scale) of the coverage area of two sensor nodes separated by a distance d when using the ED with different fusion rules. Using the OR(∨) fusion rule the coverage area is the union of the two smaller circles (indicated with shaded region) while using the AND(∧) the coverage area becomes the intersection of the two larger circles (indicated with a grid).