GIS Dictionary

[Euclidean geometry] Intersecting at right angles.

[Euclidean geometry] A line that is perpendicular to another line at its point of tangency, often used to measure distance

A planar projection, tangent to the earth at one point, that views the earth’s surface from a point approaching infinity,

[ESRI software] In 3D Analyst, a perspective that allows viewing of data in a scene as a two-dimensional plane seen

[aerial photography] An aerial photograph from which distortions owing to camera tilt and ground relief have been removed. An orthophoto

An orthophotograph that has been formatted as a USGS 1:24,000 topographic quadrangle with little or no cartographic enhancement.

[aerial photography] A photomechanical or optical-electronic device that creates an orthophotograph by removing geometric and relief distortion from an aerial

[satellite imaging] The process of correcting the geometry of an image so that it appears as though each pixel were