GPSFix.msg

# A more complete GPS fix to supplement sensor_msgs/NavSatFix.
std_msgs/Header header

GPSStatus status

# Latitude (degrees). Positive is north of equator; negative is south.
float64 latitude

# Longitude (degrees). Positive is east of prime meridian, negative west.
float64 longitude

# Altitude (meters). Positive is above reference (e.g., sea level).
float64 altitude

# Direction (degrees from north)
float64 track

# Ground speed (meters/second)
float64 speed

# Vertical speed (meters/second)
float64 climb

# Device orientation (units in degrees)
float64 pitch
float64 roll
float64 dip

# GPS time
float64 time

## Dilution of precision; Xdop<=0 means the value is unknown

# Total (positional-temporal) dilution of precision
float64 gdop

# Positional (3D) dilution of precision
float64 pdop

# Horizontal dilution of precision
float64 hdop

# Vertical dilution of precision
float64 vdop

# Temporal dilution of precision
float64 tdop

## Uncertainty of measurement, 95% confidence

# Spherical position uncertainty (meters) [epe]
float64 err

# Horizontal position uncertainty (meters) [eph]
float64 err_horz

# Vertical position uncertainty (meters) [epv]
float64 err_vert

# Track uncertainty (degrees) [epd]
float64 err_track

# Ground speed uncertainty (meters/second) [eps]
float64 err_speed

# Vertical speed uncertainty (meters/second) [epc]
float64 err_climb

# Temporal uncertainty [ept]
float64 err_time

# Orientation uncertainty (degrees)
float64 err_pitch
float64 err_roll
float64 err_dip

# Position covariance [m^2] defined relative to a tangential plane
# through the reported position. The components are East, North, and
# Up (ENU), in row-major order.

float64[9] position_covariance

uint8 COVARIANCE_TYPE_UNKNOWN = 0
uint8 COVARIANCE_TYPE_APPROXIMATED = 1
uint8 COVARIANCE_TYPE_DIAGONAL_KNOWN = 2
uint8 COVARIANCE_TYPE_KNOWN = 3

uint8 position_covariance_type