ATLAS North America Proprietary
Sea Scan® ARC Explorer™ Manual
1 of 1
Page: 11
Issue: 4.2.1
2SFT1-0001
Manual
Figure 11: When viewed from an angle, the rocks produce shadows
In Figure 11 left, the shadow area has nothing there to return a sound. Thus a shadow is created.
Just as with a sun-created shadow, the height of an object determines the length of the shadow.
Figure 12: A sonar shadow
This shadow example in In Figure 12 is an image of a bridge pylon. In this image you can see the
large base as a rounded corner rectangle. In the center is the pillar. The shadow shows that the
base of the pylon's height can be measured. The center pillar goes up out of the water, thus the
shadow extends to the end of the sonar's range.
