#surveying

• Acana — An ancient unit of measurement for length used in Greece and Persia, representing a measuring rod ten feet long (approximately three meters). In a secondary historical sense, the term also designated a square area of land determined by this rod. The concept is attested in ancient writings on land surveying and historical metrology, serving as an important indicator of agrarian organization in Antiquity.
• Aerial cartography — A technique and specialized branch of cartography dealing with the compilation, surveying, and correction of maps or topographic plans based on stereoscopic aerial photographs and photogrammetric data obtained from airplanes, helicopters, or drones. This modern process allows precise measurement of terrain relief and ground details, optimizing cadastre, urban planning, and environmental monitoring.
• Aerial photogram — An aerial photograph of a terrain portion, captured with a special photogrammetric (metric) camera mounted on an airborne platform (airplane, drone, helicopter), having rigorously known geometric and optical characteristics. This metric document serves as a fundamental basis for precise measurements, cartographic restorations, and determining the geographical coordinates of ground elements.
• Aeropolygonation — A geodesic method or technical procedure for determining network point coordinates by establishing a web of polygons measured partially or fully from aircraft or through aerophotogrammetry. This structural technique allows the rapid and precise mapping of large land areas or regions inaccessible by terrestrial means.
• Aeroplotter — A complex stereophotogrammetric apparatus used for the automatic or semi-automatic transformation and correction of aerial photographs into exact topographic maps. The device geometrically compensates for optical axis tilt during flight, enabling the drawing of contour lines and faithful three-dimensional rendering of landforms directly from photographic plates.
• Aerotriangulation — A geodetic method or precision technical procedure used to determine the three-dimensional geographic coordinates of ground control points based on the stereoscopic measurement of a succession of overlapping aerial photographs (aerophotograms). This structural technique allows the densification of topographic networks and the mapping of vast territories without performing tedious ground surveys for every point.
• Land surveyor — A person specialized in measuring land areas, establishing boundaries, and preparing topographic or cadastral plans. In Roman antiquity, the land surveyor held an extremely important administrative and legal role, being responsible for parceling public lands (ager publicus) and laying out colony borders according to rigorous geometric criteria.
• Land surveying — The art, technique, or science of precisely determining the shape, size, and position of land areas; an applied branch of topography used for measuring and parceling land properties. It includes the mathematical and instrumental methods through which administrative boundaries and cadastral maps are established.
• Alidade — A sighting device or movable part structurally integrated into geodesic, topographic, or astronomical instruments (such as theodolites, sextants, or telescopes) that rotates around a central axis. This precision assembly carries index marks, verniers, or reading microscopes, being utilized for the rigorous measurement of azimuthal or vertical angles by achieving perfect visual alignment with field landmarks.
• Tribrach — A mechanical leveling and centering base fitted with footscrews, used in surveying and geodesy as a structural support to mount optical instruments onto a tripod. It ensures horizontal structural stability and allows micro-alignment over a point.
• Quantity takeoff — A technical process, preliminary calculation, or engineering operation to determine and analytically evaluate, before starting the execution of construction or installation works, the quantities of materials, volumes of earth or concrete, and necessary labor hours. This centralizing document forms the basis for preparing the cost estimate and bills of quantities for tenders.
• Arpentagiu — An archaic or regional variant for the profession, dignity, or function of a land surveyor, designating the person historically authorized to measure agricultural land areas and establish official property boundaries. The term reflects old administrative structures influenced by Western European technical-legal terminology prior to the standardization of the modern cadastral system.
• Land surveying — The technical operation of precisely measuring the surface of an agricultural or forested land and establishing its boundaries using topographic instruments. It represents a fundamental procedure in geodesy and cadastre, utilized for drafting parcel plans, resolving boundary disputes, and officially registering properties in the land register.
• Arsa — An ancient historical unit of land measurement, formerly used in certain regions of the Romanian territories, particularly in Oltenia and Muntenia. The term referred to an arable plot of land or an agricultural area demarcated by traditional methods, its exact value varying according to the era and local surveying customs, being closely tied to medieval and pre-modern administrative organization.