Pierre Peytier

Pierre Peytier - Jean Pierre Eugène Félicien Peytier (October 15, 17931864), sometimes named Eugène Peytier - was a French officer, geographer, engineer, cartographer and painter.
Life.
Pierre Peytier entered the École polytechnique in 1811, where he obtained his diploma (X1811). He was then integrated into the topographical service of the French army in the corps of the engineers-geographers in 1813. He was promoted Lieutenant in 1817, then Capitain in 1827.
In the Pyrenees (1825).
Engineer geographer and geodesist, he was one of the first geodesic officers charged in 1825 with the triangulation of the Pyrenees in order to establish the map of France, together with his colleague Paul-Michel Hossard. By necessity of service and together with the officers Corabœuf and Testuhe, he was also one of the first pyreneists.
He made the first ascents of the Pyrenean peaks "Palas", "Balaïtous" and "Saint-Barthélemy". These true exploits went completely unnoticed at the time and many later ascensionists, believing they were achieving these ascents first, found traces of the passage of the Geodesists. That was the case for the explorer Charles Packe when reaching the summit of the Balaïtous.
Scientific expedition of Morea (1829).
Captain Pierre Peytier, of the topographic service of the French army, had already been invited to Greece by its Governor Ioannis Kapodistrias when the latter had come to Paris in October 1827 to ask the French government for advisers and officers of the army French to organize the army of the newly founded Greek State (during the Greek War of Independence). Thus, on the recommendation of the French Ministry of War, Peytier and three other officers arrived in Greece, in order to train young Greek engineers who would undertake surveying projects, while Peytier himself was to draw the plans for the city of Corinth and the map of Peloponnese. Then when the scientific expedition of Morea landed at Navarino in the Peloponnese on March 3, 1829, Peytier was thus attached to it.
As soon as from March, a base of 3,500 meters had been traced in the Argolis, from one angle at the ruins of Tiryns to an angle of a house in ruins in the village of Aria. This was intended to serve as a point of departure in all the triangulation operations for topographic and geodesic readings in the Peloponnese. Peytier and Puillon-Boblaye proceeded to perform numerous verifications on the base and on the rulers used. The margin of error was thus reduced to 1 meter for every 15 kilometers. The longitude and latitude of the base point at Tiryns were read and checked, so that again the margin of error was reduced as far as possible to an estimated 0.2 seconds. 134 geodesic stations were set up on the peninsula's mountains, as well as on Aegina, Hydra and Nafplion. Thus, equilateral triangles whose sides measured about were drawn. The angles were measured with Gambey's theodolites. However, after the departure of the scientific mission from Greece, and although he fell ill with the fever five times, Peytier remained there alone until July 31, 1831 to complete the trigonometric, topographic and statistical work for the establishment of the map of Morea.
This « ' », very precise, drawn at a 1/200,000 scale, over 6 sheets (plus two sheets depicting some of the islands of the Cyclades) was the first map of the Greek territory ever constructed scientifically and geodesically.After a passage in France between 1831 and 1833, Peytier returned to Greece on March 28, 1833 and remained there until March 1836 to direct most of the work for the preparation of the complete map of the Kingdom of Greece at that time. This « ' » was definitively published under his direction in 1852.
Peytier also left an album which he himself composed with his pencil drawings, sepias and watercolours depicting city views, monuments, costumes and inhabitants of Greece at the time. He used an artistic style that avoidied idealization for the benefit of scientific fidelity and precision, which fully revealed the topographer that he was.
The last years.
Peytier returned definitively to France in 1836 and from 1839 he continued his work on the map of France in the cartographic section of the army. He became director of the war archives. He was promoted to the rank of Colonel in 1852. He died in 1864 at the age of seventy.