Monday, July 11, 2011

Triangulation Maps

Triangulation Map URL
Triangulation maps measure the distance between landmarks.  The French cartographer, Cassini, initiated the first national-scale mappings in France in the middle of the 18th centrury.  This was what he used to measure distances.  In this map, people are located at point A and point B and something is in the distance, located with the star.  S is the distance between both the people.  The base angles at points A and B can be measured by a theodolite.  Since the distance at S is known, the distance of D can be calculated as well.

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