The World Coordinate System

The flight locating procedure establishes a World Coordinate System (WCS) based on the selected markers. The WCS is a right-handed Cartesian coordinate system. VideoF2B uses the WCS to draw all AR graphics correctly in video. The position and orientation of the WCS is as follows:

  • Origin is at the center of the base. Thus, its elevation is 1.5 m above the pilot circle.

  • Positive Y-axis passes through the front marker.

  • Positive Z-axis points vertically upward, and passes through top of circle.

  • Positive X-axis is perpendicular to both Y and Z axes, and generally points to the right in video.

    _images/wcs.png

Manipulations of the Flight Hemisphere

During processing of Augmented Reality videos, the user can move the flight hemisphere in the XY plane of the WCS. The movements are always along the directions of the principal XY axes of the WCS:

  • Left/right movements are along the X axis.

  • Forward/backward movements are along the Y axis.