Terminology

Terminology

This topic describes terminology for use in

• heads up displays
• first person views
• location views

Roll

• Longitudinal axis
• Tip: Hold the device up in front of you with two hands like your holding a steering wheel, and look at the screen. Rotate the device around screen center, like you would turn a steering wheel from left to right.

Bearing

• Direction of a distant object relative to the current course

Heading

• Direction of travel

Yaw

• A yaw rotation is a movement around the yaw axis of a rigid body that changes the direction it is pointing, to the left or right of its direction of motion.
• https://en.wikipedia.org/wiki/Yaw_(rotation)
• Tip: Hold the device up in front of you with two hands like your holding a steering wheel, and look at the screen. Push your left hand back and forward (and alternatively righ hand), rotating the device around is vertical centerline.

Latitude

• North-south position of a point on the earths surface

Longitude

• East-west position of a point on the earths surface

Altitude

• Height of ground above mean sea level

Height

• Height of feature above mean sea level or ground (depends on data)

Horizontal Accuracy

Vertical Accuracy

Speed

• horizontal distance traveled by an object over time

Vertical Speed

• Rate of change in altitude - ascent or descent

Magnetic declination or variation

• Angle on horizontal plane between magnetic north and true north
• Varies both from place to place and passage of time
• https://ngdc.noaa.gov/