Concept for Reference Frames in Geodesy and Geodynamics: The Reference Directions

Reference Systems in Satellite Geodesy

Qualitative Directions in Egocentric and Allocentric Spatial Reference Frames

In this paper, we have presented a formalism for representation of and reasoning about directions in a qualitative way in two spatial reference frames, namely, an egocentric reference frame and an allocentric reference frame. Qualitative direction has been separated from dimensionality of spatial objects and as such, the formalism may be used to represent qualitative direction in a dimension-in...

Reference Ellipsoid and Geoid in Chronometric Geodesy

Chronometric geodesy applies general relativity to study the problem of the shape of celestial bodies including the earth, and their gravitational field. The present paper discusses the relativistic problem of construction of a background geometric manifold that is used for describing a reference ellipsoid, geoid, the normal gravity field of the earth and for calculating geoid’s undulation (hei...

Reference Frames for Stellar Aberration

There is some confusion in the literature as to what velocity should appear in the stellar aberration formula. Because the aberration formula is usually derived from the same equations as the Doppler shift, where the relative velocity between source and detector is the relevant one, it is often assumed the same holds for aberration. This is not the case. Authors who choose the orbital velocity ...

Reference Frames for Animate Vision

Animate vision systems have gaze control mechanisms that can actively position the camera coordinate system in respose to physical stimuli. Compared to passive systems, animate systems show that visual computation can be vastly less expensive when considered in the larger context of behavior. We are accustomed to thinking of the task of vision as being the construction of a detailed representat...