Glossary

Definitions

Canonical reference system

A right-handed, isometric variation of a Cartesian coordinate reference system.

Coordinate reference system (CRS)

Following the EPSG definition, a coordinate reference system or CRS “consists of one coordinate system that is related to an object through one datum”. It allows describing spatial positions on the object of interest unambiguously.

Processing CRS

A canonical CRS plus a translation defined by a project’s scene reference frame. The translation is meant to move the centroid of the project close to (0, 0, 0) for numerical stability during processing and visualization.

Scene reference frame

A base CRS and a transformation to its translated canonical form.

Spatial reference system

See coordinate reference system.

Acronyms

• CRS: Coordinate reference system

• GCP: Ground control point

• MTP: Manual tie point