Photogrammetry, the art of making measurements from images, synthesizes the science of mathematics and the technology of photography. The development of photography in the 19th century, which is the embodiment of projective geometry, led to widespread development of photogrammetry for topographic and architectural measurement by the end of the century.
The first topographic map was produced [using photogrammetry] in 1861 depicting the village of Buc and covering approximately 200 hectares. This and other successful mapping demonstrations led to the establishment of a French military mapping unit using Laussedat’s equipment and techniques.