This is the 10200th most frequent Korean word.
관측이다
"관측이다" means "to observe" or "to be an observation."
Here, '관측이다' means 'it is an observation', describing the nature of the phenomenon.
이 현상은 관측이다.
This phenomenon is an observation.
In this case, '관측이다' identifies the context before suggesting an action.
관측이다, 이 데이터를 분석해보자.
It's an observation, let's analyze this data.
This use of '관측이다' implies that the reasoning or data involves the act of observing.