- control point
- Aerial Photogrammetry.a point located on the ground by precise surveying that when identified on aerial photographs provides the control necessary for producing a photomap.[1925-30]
* * *control point,1. a point or feature used for purposes of reference or orientation, as a landmark in navigation: »
The geodesist…establishes what are called geodetic control points, locations he has pinned down…as a guide for plotting all other locations and computing all distances (Life).2. a position or station used for control and regulation of traffic: »
Studies by Stanford's Engineering Division…suggest that pictures of trains moving at 60 miles an hour can be flashed to the appropriate control point in a matter of seconds (New Scientist).
Useful english dictionary. 2012.