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GB/T 33673-2017 PDF English

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GB/T 33673-2017: Grade of horizontal visibility
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GB/T 33673-2017: Grade of horizontal visibility

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GB NATIONAL STANDARD OF THE PEOPLE’S REPUBLIC OF CHINA ICS 07.060 A 47 Grade of Horizontal Visibility 水平能见度等级 Issued on: MAY 12, 2017 Implemented on: DECEMBER 1, 2017 Issued by. General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China; Standardization Administration of the People's Republic of China. 3. No action is required - Full-copy of this standard will be automatically & immediately delivered to your EMAIL address in 0~60 minutes.

Table of Contents

Foreword ... 3 1 Application Scope ... 4 2 Terms and Definitions ... 4 3 Grade of Horizontal Visibility ... 4 Bibliography ... 5

Foreword

This Standard was drafted in accordance with the rules given in GB/T 1.1-2009. This Standard was proposed by China Meteorological Administration. This Standard shall be under the jurisdiction of the National Standardization Technical Committee on Meteorological Disaster Prevention and Reduction. The drafting organization of this Standard. Hebei Xingtai Meteorological Bureau. The main drafters of this Standard. Yang Yongsheng, Wang Congmei, Zhang Yingxin, Liu Jin. Grade of Horizontal Visibility

1 Application Scope

This Standard specifies the grade of horizontal visibility. This Standard applies to the monitoring, forecasting and services of horizontal visibility.

2 Terms and Definitions

For the purposes of this document, the following terms and definitions apply. 2.1 horizontal visibility meteorological visibility The maximum horizontal distance of target objects (black, of moderate size) seen or recognized by a person with a normal eyesight from the sky background under the weather conditions at that time; at night, it refers to the maximum horizontal distance of illuminants of moderate strength which can be seen and recognized. NOTE The minimum brightness contrast (contrast threshold) which is perceptible by the eyes of a person with a normal eyesight is 0.05.

3 Grade of Horizontal Visibility

The grades of horizontal visibility include grade 1 ~ grade 6. The range of visibility and qualitative term of each grade is shown in Table 1. Table 1 – Grade of Horizontal Visibility Grade Qualitative description term Horizontal visibility 1 Excellent V ≥ 10 km 2 Good 2 km ≤ V < 10 km 3 General 1 km ≤ V < 2 km 4 Relatively poor 500 m ≤ V < 1 km 5 Poor 50 m ≤ V < 500 m ......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.


      

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