Assertion: sonar | /r/HasAspect | altitude
Facets:
value: at a 10m range
type: LOCATION
value: above the sea bottom
type: LOCATION
Source sentences:
text: For example, at a 10m range, the sonar should have an altitude of 1m above the sea bottom.
text: If the sonar has an altitude closer to the bottom and a shallower down angle, acoustic shadows cast by targets will be longer allowing for easier interpretation.