Comparison of the Visibility Grading Forecast Method Based on Meteorological Factors and Environmental Factors

Table 1

Visibility grading standard.

Visibility level	Meteorological visibility (m)	Aircraft flight standard
1	vis ≤ 800	When visibility is less than or equal to 800 m, all aircraft cannot take off
2	800 < vis ≤ 1,600	When visibility is greater than 800 m, twin-engine turbo, three-engine turbo, and four-engine turbo aircrafts can take off
3	1,600 < vis ≤ 2,000	When visibility is greater than 1,600 m, one-engine and twin-engine aircrafts can take off
4	2,000 < vis ≤ 5,000	When visibility is greater than 2,000 m, students can participate in the flight training
5	vis > 5,000	When visibility is greater than 5,000 m, the student can fly an aircraft alone