Horizon at station Abashiri

The ideal site for the measurement of solar and terrestrial radiation for meteorological purposes is one that has a completely flat horizon. The WMO Guide to Meteorological Instruments and Methods of Observation (WMO No. 8) recommends that if possible no obstruction should be present, particularly within the azimuth range of sunrise and sunset over the year. This dataset describes the horizon at the BSRN radiation site ABS as additional information on the site's surroundings.用于气象观测的太阳辐射与地面辐射（solar and terrestrial radiation）测量的理想站点，需具备完全平坦的地平线。世界气象组织《气象仪器和观测方法指南》（WMO No.8）明确建议，若条件允许，站点周边不应存在任何遮挡物，尤其需避开全年日出与日落方位角范围内的遮挡。本数据集将对基准地面辐射观测网（Baseline Surface Radiation Network，BSRN）辐射观测站ABS的地平线情况进行说明，作为该站点周边环境的补充信息。