{"id":81,"date":"2016-03-22T17:29:29","date_gmt":"2016-03-22T17:29:29","guid":{"rendered":"http:\/\/newvista.cira.colostate.edu\/Improve\/?page_id=81"},"modified":"2024-12-30T14:39:14","modified_gmt":"2024-12-30T14:39:14","slug":"haze-metrics-converter","status":"publish","type":"page","link":"https:\/\/vista.cira.colostate.edu\/Improve\/haze-metrics-converter\/","title":{"rendered":"Haze Metrics Converter"},"content":{"rendered":"\n
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Note: 3 converters are given below<\/strong><\/em>, dependent on input (VR, bext, and DV).<\/p>\n<\/div><\/div>\n\n\n\n

Caution: The converters cannot be used for average values.<\/strong> <\/em> E.g. you cannot calculate average DV from average bext<\/sub>; instead, you must calculate DV for each daily measurement, and then calculate an average DV from the individual DV values.<\/p>\n\n\n\n

Visual Range (V.R.)<\/strong>:The greatest distance at which an observer can just see a black object viewed against the horizon sky.<\/p>\n\n\n\n

Units<\/strong>:  Distance, e.g. kilometers (km)<\/p>\n\n\n\n

Benefit<\/strong>:  This metric is most useful in situations where only the distance that one can see is important, such as for aviation.<\/p>\n\n\n\n

Drawback<\/strong>:  Does not account for changes in scene, such as loss of textures and discoloration as haze increases.<\/p>\n\n\n\n

Relationships<\/strong>:<\/p>\n\n\n\n

V.R. = K\/bext<\/sub><\/p>\n\n\n\n

Where K is the Koschmieder Coefficient \u2013 the natural log of the contrast threshold of the human eye,  K = 3 \u2013 3.9.<\/p>\n\n\n\n

Note that a unit conversion is required in converting between V.R. and bext<\/sub>.<\/p>\n\n\n\n

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