A Softsensor for Wind Measurements in Karst Caves.

A data-driven soft sensor of wind in a cave passage is developed as an alternative to physical anemometers for measuring wind velocity. It is intended to either fill data gaps during periods without physical measurements or to serve as a substitute for the physical sensor. It is implemented as a Gaussian process model, trained on one year of half-hourly measurements. Statistical measures and visual inspection of the test data indicate that both selected model structures perform well. Therefore, soft sensors represent a viable tool in underground meteorology. They may replace physical sensors that are fragile, power-intensive, or expensive. Alternatively, they can fill data gaps when a physical sensor is unavailable.