Definitions for "Direct observation"
In situ measurements of meteorological elements at weather stations, from ships and aircraft, and with instrumented probes such as rawinsondes.
The study of things you have actually seen, rather than things you have heard about or read about.
Gathering information about things that can be observed. For example, by visiting an organization, one can directly collect information on the physical surroundings. By observing meetings, one can observe who shows up, how people interact, and what decisions are taken.
A research technique in which a researcher observes and records behavior or an event as it occurs.
Keywords:  snorkles, divers, masks, counting, fish
teams of divers with masks and snorkles counting fish.