Well, its part of the Struve Geodetic Arc. Hmmm, I see confused faces.....
Well, the Struve Geodetic Arc is a chain of survey triangulations stretching from Hammerfest in Norway to the Black Sea, through ten countries and over 2,820 km.
The chain was established and used by the German-born Russian scientist Friedrich Georg Wilhelm von Struve in the years 1816 to 1855 to establish the exact size and shape of the earth.
It is now a UNESCO World Heritage Site.
The Arc enters Finnish territory north of Suursaari, passes southern Finland to the east of Loviisa, goes through the Lahti and Jyväskylä regions and continues through Kajaani, Oulu, Tornio and Muonio to Hammerfest in Norway.
A total of 34 station points have been selected for protection, six of these being located in Finland: Stuor-oivi (now known as Stuorrahanoaivi) near the Norwegian border; Avasaksa (Aavasaksa) and Tornea (Alatornio church) in western Lapland; Puolakka (Oravivuori) in Korpilahti; Porlom II (Tornikallio) at Porlammi in Lapinjärvi; and Svartvira (Mustaviiri) in the
The Porlammi (Porlom II) point at Tornikallio in Lapinjärvi was measured in 1833.
Since then, Tornikallio has been one of the station points for geodetic measurements in Finland, and there was also an NLS triangulation tower at the site until the mid-1980s. Even though the views seen by the Struve expedition are now partially obstructed by forest, Tornikallio remains a popular observation point.......
Hmmm, you really didnt think that we would fly over Finland and not see some forests, did you??