A sightline, sight line or visual axis, is a normally unobstructed line-of-sight between an intended observer (or spectator) and a stage, arena, or monument, for example. Sightlines are a particularly important consideration in theatre and stadium design, road junction layout and urban planning. sightline, sight line or visual axis, is a normally unobstructed line-of-sight between an intended observer (or spectator) and a stage, arena, or monument, for example. Sightlines are a particularly important consideration in theatre and stadium design, road junction layout and urban planning.
The CIA does do undercover (spy like) procedures because sometimes it has to but in actuality most of its information comes from people who offer to supply information. These people provide support to the CIA in support of their ideological, religious, political and personal beliefs. Some for vengence and others just out of greed.
Here i am guessing you wrote NSA, cause your question actually says NASA. Probably a typo. NSA - NSA is basically a intelligence gathering agency. They do any and all kinds of surveillance. The original goal was to monitor foreign nationals inside US or outside US who might be a person of interest. Recently it came out that NSA also conducting surveillance over US citizen inside US.