The cloudamount is one of the most important factors in an astronomical site survey.
云量观测是天文选址的重要考察项目。
2
Annual and seasonal sunshine hours decreased with the increasing of low level cloudamount, and the reduction of sunshine hours increased along with vapor pressure in winter.
年、季日照时数减少与低云量增加关系密切，而冬季日照时数的减少还与水汽压的增加有关。
3
Similar to the method of Z index of precipitation, a trial research is made on monitoring drought by the amount of cloud, and the method of Z index of cloudamount is established.