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THE EFFECT OF HAZE AND HIGH SOLAR ALTITUDE ON THE DENSITY OF AIR SURVEY NEGATIVES
Author(s) -
Hall R.
Publication year - 1954
Publication title -
the photogrammetric record
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.638
H-Index - 51
eISSN - 1477-9730
pISSN - 0031-868X
DOI - 10.1111/j.1477-9730.1954.tb01009.x
Subject(s) - haze , daylight , shadow (psychology) , altitude (triangle) , negative , meteorology , sunlight , environmental science , photography , optics , variation (astronomy) , density of air , atmospheric sciences , remote sensing , geography , geology , physics , astronomy , mathematics , art , geometry , psychology , visual arts , psychotherapist
SUMMARY The effect of haze in vertical daylight air photography for various solar altitudes is considered. If appreciable haze is present the density of negatives exposed when the solar rays are inclined to the vertical at angles less than the lens field semi‐angle may vary over the field to such an extent that the photographs will be unsuitable for survey purposes. A theoretical investigation is made and practical results analysed. Methods by which the phenomena may be avoided are suggested. The effect on negative density of the variation in shadow length across the picture is also discussed.