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.

  TODO: replace the photo below with a field photo that shows:

  • all four markers and the camera on a tripod outside the circle.

  • SVG graphics that depict the WCS.

  • AR graphics that depict the flight hemisphere.