Reprojection error
Definition
The distance in pixels between where the photogrammetry software predicts a feature point should appear in each photograph (based on its estimated 3D position) and where it actually appears. Low reprojection error (under 1 pixel) indicates a well-calibrated, accurate model.
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...
- Orthophoto
- A geometrically corrected aerial or close-range photograph from which the distortions caused by camera tilt and terrain relief have been removed, so...
- 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 RecordingThe distance in pixels between where the photogrammetry software predicts a feature point should appear in each photograph (based on its estimated 3D position)...