Category: Processing and quality
Orthorectification
Orthorectification corrects geometric distortion so imagery aligns properly with the ground, using terrain and sensor geometry.
Also known as: ortho correction, ortho-rectified
Expanded definition
Orthorectification uses a DEM and sensor geometry to correct distortions caused by terrain and viewing angle.
Without orthorectification, features in hilly terrain can appear shifted. For precise parcel analytics, orthorectification and consistent georeferencing are essential so polygons overlay the right pixels across dates.
Related terms
DEM (Digital Elevation Model)
A DEM is a raster representing elevation, used for terrain correction, hydrology, and orthorectification.
Georeferencing
Georeferencing links pixels or coordinates in a dataset to real-world locations on Earth.
CRS (Coordinate Reference System)
A CRS defines how coordinates map to locations on Earth, including the projection and datum.