Instruments deployed in dynamic situations require ancillary sensors to correlate, complement, and provide quality control for optical data. In-water profilers require accurate pressure measurements to correlate light levels with water column depth. Accurate water temperature measurements provide information on the layering or mixing of a body of water that is being sampled. This data can provide explanations for inflection points in the optical data, and help identify appropriate extrapolation intervals for data product retrieval. Instrument attitude (tilt) is of particular importance for in-water, ship-based, or airborne sensing. In addition to providing situational awareness, many data products require tilt filtering to ensure compliance with quality-control protocols.
