ISO 28902的本部分主要规定了进行视距激光雷达测量的要求 用于测定与方向有关的气象光学距离（MOR）。“视距激光雷达”一词 在ISO 28902的这一部分中，通常用于进行视距测量的激光雷达系统 被称为“能见度测量”。由于物理近似，定量测定受到限制 适用于30米到2000米之间的气象光学范围。对于该范围，ISO 28902的本部分 指定使用距离-综合视距方法的视距激光雷达系统的性能 基于消光的测量。以下参数可根据方向相关参数进行计算 气象光学范围: a） 水平视野； b） 垂直视距； c） 倾斜视野。 注:可见度的度量与可见度的历史定义密切相关，后者与人类活动有关 观察员。激光雷达技术将定义扩展到各种条件，例如白天和夜间条件。 此外，这种测量原理使用户能够检索云底高度、边界和边界的信息 由于水蒸气和/或气溶胶的信号衰减而导致的层深、雾团和气溶胶剖面。 附件C中给出了这些应用的示例。 ISO 28902的本部分适用于以下领域: -气象站； -机场； -港口； -水道； -道路和高速公路； -汽车； -石油平台。

This part of ISO 28902 mainly specifies the requirements in order to perform visual range lidar measurements for the determination of direction-dependent meteorological optical range (MOR). The term "visual-range lidar" is used in this part of ISO 28902 to apply to the lidar systems making visual-range measurements, commonly referred to as "visibility measurements". Due to physical approximations, quantitative determination is limited to a meteorological optical range of between 30 m and 2 000 m. For this range, this part of ISO 28902 specifies the performance of visual-range lidar systems utilizing the method of range？integrated visual-range measurements based on light extinction. The following parameters can be calculated based on the directiondependent meteorological optical range: a) horizontal visual range; b) vertical visual range; c) slant visual range. NOTE The measures for visibility are strongly related to the historical definitions of visibility, which are related to human observers. The lidar technique extends the definitions to various conditions, such as daylight and night-time conditions. In addition, this measurement principle enables the user to retrieve information on cloud base height, boundary layer depth, fog banks and aerosol profiles due to the signal attenuation by water vapour and/or aerosols. Examples of these applications are given in Annex C. This part of ISO 28902 can be applied in the following areas: — meteorological stations; — airports; — harbours; — waterways; — roads and motorways; — automotive; — oil platforms.