Orthophoto
Definition
A geometrically corrected aerial or close-range photograph from which the distortions caused by camera tilt and terrain relief have been removed, so that measurements of distance and area can be made directly on it as if it were a plan.
Related terms
- Dense point cloud
- A set of millions of three-dimensional coordinate points, each with an RGB colour derived from the photographs, that together represent the surface...
- Ground Control Point (GCP)
- A physical marker in the scene whose three-dimensional coordinates have been measured independently by total station or GPS. Assigning those coordinates to...
- Reprojection error
- The distance in pixels between where the photogrammetry software predicts a feature point should appear in each photograph (based on its estimated...
- Structure-from-Motion (SfM)
- A photogrammetric technique in which overlapping images from a drone or camera, processed by software, generate a three-dimensional point cloud and textured...
- Terrestrial laser scanning (TLS)
- A ground-based 3D LIDAR survey instrument that captures millions of range measurements per scan to produce a millimetre-accurate point cloud of the...
Explained in
- Close-Range Photogrammetry and 3D RecordingA geometrically corrected aerial or close-range photograph from which the distortions caused by camera tilt and terrain relief have been removed, so that measu...