A general formula for atmospheric correction in electro-optical distance measurement.

概要

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A formula to obtain an atmospheric correction that is required in the electro-optical distance measurement (EDM) under any atmospheric conditions is deduced, and tested in the field observations. The present method is a modification and extension of the one developed by ANGUS-LEPPAN and BRUNNER considering the three atmospheric regions proposed by ANGUS-LEPPAN. These three regions are classified according to the Obukov length that is calculated from the mean height along the light pass and other suitable parameters. The usual correction by using mean temperature and pressure obtained from the observations at the both end points is called normal correction and the new one A-B correction. Test observations are carried out in two networks with short range (3-4 km) and moderate range (several-10 km) side-length. The results of this study are:(1) When we define efficiency ratio as η=[{(s.d. of normal correction)-(s.d. of A-B correction)}/(s. d. of normal correction)]×100, η is several percentage under short range side-length, and(2) The method cannot be applied to the side-length more than 10 km.
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