Computer Aided Design, or Computer Aided Drafting.

Camera calibration is the process of finding the true parameters of the camera that took your photographs. Some of these parameters are focal length, format size, principal point, and lens distortion.

A Constraint is a piece of additional information the user knows (or is willing to assume) about the scene or object. For example, knowing that 5 points in a project all line in a straight line (i.e. [..]

A Control Point is a known location in space with either X,Y or X,Y,Z values known. Control Points can be used in photogrammetry to define a known coordinate system, or to form constraints on the solu [..]

The DXF file format is a data exchange standard defined by AutoDesk, Inc. Many CAD and rendering packages can import DXF data files. PhotoModeler can create a 3D or 2D DXF file containing the solved 3 [..]

Short for EXchangeable Image File. This is a file format specification for storing information in digital photography image files. Almost all new digital cameras use the EXIF format, storing informati [..]

A distinguishing mark on an object or in a scene that can be seen in a photo. We talk about marking and measuring features. Whether something is a feature or not is in the eye of the beholder. The edg [..]

In context of a camera in photogrammetry, a fiducial is a reference point that is seen in the resulting image that came from a point fixed to the camera body. Fiducials allow PhotoModeler to recover t [..]

Focal Length is the Principal Distance when the lens of the camera is focused at infinity. Also see Principal Distance.

A location on a single photograph representing the image of some physical feature.