岐阜県上宝地域で行なっている光波測量への気象的影響

概要

論文の詳細を見る
A tendency that distances measured in the mornings are generally longer than those measured in the afternoons was found on the results from electro-optical distance surveys repeated every year since 1977 at the Kamitakara area in Central Japan. This indicates that similar meteorological circumstances which affect the surveys appeared every year in the same season and we may reduce the diurnal errors by performing surveys at fixed times on day in the same season. A simulation has been made to understand the relation between diurnal changes in the air temperature along lightpaths and the errors in the distances obtained by the usual meteorological correction using the air temperature and pressure at both ends of survey lines. By adopting an exponential decrease of the amplitude and the phase delay with height in the diurnal temperature change to be 90% and 4 hours per 100 m, respectively, the observed diurnal changes in the results at Kamitakara are well explained and corrections in respect of survey times reduce successfully the scatter in the survey data and increase their reliability.
日本測地学会の論文