Method for measuring atmosphere visibility

Abstract

The invention proposes a method for measuring atmosphere visibility, which includes the flowing steps that: A, a plurality of image edge intensity values under different visibility conditions are obtained through a video camera, and a plurality of visibility values corresponded to each image edge intensity value are obtained, then a visibility prior knowledge database in which the image edge intensity and the intensity measured value has one-to-one correspondence is constructed; B, a visibility computing formula for relationship between edge intensity of a fixed scene image and visibility is obtained according to the visibility prior knowledge database; C, when current image edge intensity of the observation point is obtained through the video camera, current atmosphere visibility value is calculated by using the visibility computing formula. The method has advantages that visibility observation is carried through an existing video monitoring device used for city management, then objectivity and importance of visibility observation are improved.

Description

technical field [0001] The invention relates to the technical field of environmental measurement, in particular to a method for measuring atmospheric visibility and a method for obtaining other atmospheric parameters according to the atmospheric visibility value. Background technique [0002] Atmospheric visibility is an index reflecting the transparency of the atmosphere and a meteorological parameter that has an important impact on aviation, navigation, land transportation and military activities. It is generally defined as the maximum ground horizontal distance at which a person with normal vision can still see the outline of the target clearly under the prevailing weather conditions. The maximum horizontal distance of a target (black, moderate size) that a person with normal vision can see and recognize from the sky background under the weather conditions at that time; at night, it is the maximum horizontal distance that can be seen and determined on a certain intensity ...

AI Technical Summary

Problems solved by technology

At present, the observation of visibility is mostly based on manual visual inspection, which is relatively poor in standardization and objectivity.

[0005] Atmospheric transmissometer directly measures the air column transmittance through the beam passing through the atmospheric column between two fixed points, so as to calculate the value of visibility. This method requires the beam to pass through a long enough atmospheric column, and the reliability of the measurement is affected by the light source and Influenced by the stability of other hardware systems, it is generally only suitable for observations with visibility below the middle level. In low-visibility weather such as rain and fog, large errors will be caused by complex conditions such as water vapor absorption. At the same time, this method assumes that the distance between two points of the projector is The state of the atmosphere is the same as the state of the surrounding atmosphere. If the space of the state of the atmosphere changes greatly, it will cause a large deviation between the observation results of the projector and the actual situation.

[0006] The laser visibility automatic measuring instrument calculates the visibility by measuring the atmospheric extinction coefficient with a laser. Relatively speaking, it is more objective and accurate, but this instrument is expensive, maintains high, and is complicated to operate. It is difficult to carry out normal observation, so it is difficult to promote, and the visibility observed by this method only represents the visibility in a certain observation direction, which is inconsistent with the real visibility of the atmosphere

[0007] Existing video methods to extract atmospheric visibility algorithms require manual intervention, adjusting parameters or setting up targets along the observation direction, making these methods time-consuming and laborious, and cannot be run automatically

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