Apparent wind in knots and degrees. Note that a number of additional factors come into play when converting the measurements from the masthead anemometer into the true wind if a high degree of accuracy is required, including the following: In the presence of a current, the true wind is considered to be that measured on the craft drifting with the water over the bottom, and wind with respect to the sea bed as the "ground" or "geographical wind". The apparent wind on board (a boat) is often quoted as a speed measured by a masthead transducer containing an anemometer and wind vane
Wind power in Thailand resource map with 13 year-long data (1966-1978) from 53 wind speed measurement stations of the TMD, using power law to standardize all wind speed to 10 m. In 1984, another similar attempt was carried out by KMITT, using 17 year-long (1966-1982) data from 62 measurement stations, and with financial support from USAID. Attempts at producing wind resource maps of Thailand all faced the problem of shortage in wind speed data, especially offshore and at high elevations. This resulted in maps with low coverage. In 2001, another set of wind resource maps was produced by DEDE using data from over 150