Ferdinand Antoine Jules de la Roche-Poncié (August 19, 1810 – March 30, 1881) was a French hydrographic engineer and cartographer active throughout the 19th century. Poncié was born in Vauxrenard, France. After graduating from the École Polytechnique in 1829 he joined the French navy, becoming a naval hydrographic engineer in 1832. Numerous important French surveys bear his name, including the first detailed hydrographic survey of the St. Pierre and Miquelon Islands, and numerous maps of East Asian waters. He received the Legion of Honor in 1841, ultimately attaining the grade of Commander. In 1860 he settled in Paris where he became a member of the Hydrographic Committee under Rear-Admiral Pierre Mathieu. He died in Paris in 1881. More by this mapmaker...

Dépôt des Cartes et Plans de la Marine (fl. 1720 - present), often called the Dépôt de Marine, was a French hydrographic mapping organization founded in 1720 under Charles-Hercule of Albert de Luynes (1674 - 1734). Much like the U.S. Coast Survey, the British Admiralty, and the Spanish Deposito Hydrografico, the Dépôt was initiated as a storehouse and distribution center of existing nautical and marine charts. Eventually the Dépôt initiated its own mapping activities in an attempt to improve and expand upon existing material. Some of the more prominent cartographers and hydrographers associated with the of Dépôt des Cartes were, Philippe Buache, Jacques-Nicholas Bellin, Giovanni Rizzi-Zannoni, Rigobert Bonne, and Jean Nicolas Buache. Learn More...

Jacques-Marie Hacq (September 22, 1785 – 18??) was a French letter and line engraver, and historian, active in Paris during the middle part of the 19th century. Hacq was born in Paris and trained under J. P. Besançon, who he succeeded at the Dépôt de la Guerre in 1830. He engraved for the Dépôt de la Guerre as early as 1830 and for the Dépôt des Cartes et Plans de la Marine from, at least, 1840 to 1852. In addition to his work for the French Government, he also completed maps and engravings for Lesage, Lapie, Dufour, Duperrez, Gouvion St. Cyr, and Dumont d'Urville. His historical works include a history of the Napoleonic Wars and a history of Paris under the reign of Louis XIII. During most of his career in Paris he lived at 58 Rue de la Harpe. Learn More...

Chassant (fl. c. 1830 - 1860) was a French line and chart engraver active in Paris in the middle part of the 19th century. Chassant was active with the French Dépôt de Marine from the 1830s into the 1860s. He was a master engraver and, some have argued, his dramatic hachuring work to illustrate topography suggests he may have been wasted on nautical charts. Most of his engraving was completed in partnerships with Jacques-Marie Hacq (September 22, 1785 – 18??). Chassant did not sign any of his engravings with a first name or other identifier, so it is difficult to track him down. He may be Alphonse Antoine Louis Chassant (August 1, 1808 - September 7, 1907), who in later life was an art historian and librarian of the city of Évreux. He wrote several books, including works on engraving. We cannot alas verify the connection and it may be pure guesswork. Learn More...