A Region-ping intersection, RP, is that part of a 3D region R which intersects with a ping, P (in both space and time). The diagrams below show a 3D region and multibeam ping (in a scene), the original ping (in a multibeam echogram), and the resulting region-ping intersection (both with data and zoomed without for clarity). The region-ping intersection is visible on a multibeam echogram as a black border enclosing an area crosshatched in the color of an analysis region. The cross hatching is twice as dense if the region is selected.
Figure 1. Ping (P) and Region (R) in a Scene

Figure 2. Ping

Figure 3. Region-ping intersection (RP)

Figure 4. Region-ping intersection (RP) - zoomed with all data below threshold
About intersections
About region-cell intersections
About surface-ping intersections