18 Feb
2017
18 Feb
'17
12:20 p.m.
18. 2. 2017 v 9:20, Benedikt Hallinger via Therion <therion@speleo.sk>:
Based on what you have said, i would assume that the problem source lies in therion itself summarizing all centreline dates into one survey average date, and not just by centerline as i would assume, when each centerline has a date specification.
The main issue here is, that we have surveys which were taken in the 1950s and extended with an additional centerline in 2000s.
date and date - each survey has calculated its own declination according the date it was surveyed. The position of point for which the declination is calculated is averaged. m.s.