UNESCO Struve Geodetic Arc - PORLOM II Tornikallio Postcard

UNESCO WHS Serie - World Heritage Sites in Finland - Struve Geodetic Arc - PORLOM II Tornikallio - The Struve Arc is a chain of survey triangulations stretching from Hammerfest in Norway to the Black Sea, through 10 countries and over 2‘820 km. These are points of a survey, carried out between 1816 and 1855 by the astronomer Friedrich Georg Wilhelm Struve, which represented the first accurate measuring of a long segment of a meridian. This helped to establish the exact size and shape of the planet and marked an important step in the development of earth sciences and topographic mapping. The Porlammi site was located on the top of Tornikallio rock, in the municipality of Lapinjärvi at lake Pyhäjärvi. The point was established in 1833 and was marked as a drill hole in bedrock. There is a magnificent view of Pyhäjärvi. The slope of the rock is very steep to the lake. Name: Struve Geodetic Arc Site: PORLOM II Tornikallio Country: Finland Location: Korpilahti, Jyväskylä, Central Finland Region Inscription: 2005 Category: Cultural (ii)(iv)(vi) Unesco Ref: 1187-013 Special Feature: The card has a QR-Code on the backside to navigate for more Informationas about the site.