Anemometer turbines usually requires a refresh rate of wind speed measurements of 3 Hz, easily achieved by sonic anemometers. Three-dimensional sonic anemometers are widely used to measure gas emissions and ecosystem fluxes using the eddy covariance method when used with fast-response infrared gas analyzers or laser-based analyzers. Two-dimensional wind sensors are of two types: Acoustic resonance anemometers are a more recent variant of sonic anemometer. The technology was invented by Dr Savvas Kapartis and patented in 2000. Whereas conventional sonic anemometers rely on time of flight measurement, acoustic resonance sensors use resonating acoustic (ultrasonic) waves within a small purpose-built cavity in
Measure S housing, that local labor be used on them, and incentivized developers for building near the city's subway lines. The city's business community, particularly developers, were as opposed to it as they were to Measure S. However, so was the CPLA. In a news release strongly opposing JJJ, it claimed that initiative had been "cooked up" by the interests opposing Measure S in an effort to split its support and keep it from the ballot. Measure S proponents said that they considered JJJ likely to fall short of its goals, pointing to what they considered broadly worded loopholes in JJJ. "Ultimately