TagScientific Measurement(2)

Technical diagram illustrating Sound Exposure Level (SEL), maximum sound level (Lmax), and sound energy distribution over time with 10dB reference intervals. Explains measurement methodology used to quantify instantaneous noise events from aircraft operations.

Kelsh Projection Stereoplotter (1960). This was an automatic digital data input system used in conjunction with the photogrammetric plotter. The stereoplotter required two aerial photographs that have considerable overlap (60%). The photos are put onto transparent media and projected with a light source. Each image will be projected with overlap on the other. The operator,