A phototheodolite is a surveying instrument used to measure horizontal and vertical angles, as well as distances. It is a specialized camera that is mounted on a theodolite, which is a device used to measure angles. The phototheodolite combines the functions of a camera and a theodolite, making it an essential tool for surveying and mapping. Synonyms for the word phototheodolite include photogrammetry instrument, survey camera, and optical theodolite. Other related terms might include land surveying equipment, photogrammetry gear, or angle measuring device. Whatever term is used, the phototheodolite remains a crucial tool in the world of precision surveying and mapping.