Freefly ALTA - Appendix B. Data Logging Fields

101| USER MANUAL
APPENDIX B. DATA LOGGING FIELDS
FIELD UNITS DESCRIPTION
Reading Unitless
An indexed identifier
assigned to data points
IMU Time Seconds
The number of seconds
from arming ALTA
GPS Time HH:MM:SS
The Universal Coordinated Time
determined by received GPS signals.
GPS Longitude Degrees * 10^7
GPS determined longitude
multiplied by 10^7
GPS Latitude Degrees * 10^7
GPS determined latitude
multiplied by 10^7
GPS Height meters
Height above the WGS84
reference ellipsoid
GPS Course degrees
The ground track of ALTA in
degrees from true north.
GPS Position
North
meters
The distance ALTA traveled north
from the starting point. A negative
number indicates southward travel.
GPS Position East meters
The distance ALTA traveled east
from the starting point. A negative
number indicates westward travel.
GPS Position Up meters
The distance ALTA traveled above the
starting point. A negative number
indicates downward travel.
GPS Velocity
North
meters / second
The GPS derived northward
velocity component of ALTA.
GPS Velocity East meters / second
The GPS derived eastward
velocity component of ALTA.
GPS Velocity Up meters / second
The GPS derived upward
velocity component of ALTA
GPS Acceleration
North
meters / second^2 The GPS derived northward acceleration
GPS Acceleration
East
meters / second^2 The GPS derived eastward acceleration
GPS Acceleration
Up
meters / second^2
The GPS derived upward acceleration,
without gravitational acceleration