We are trying to feed gps data into the ekf's /vo topic, and I have seen the tutorial for swapping visual odometry out for gps, but I haven't been able to find the units for x, y, z pose in the that Odometry msg. I have poked around in the source a bit, and I haven't been able to find any clues to the units, though I imagine it is displacement in meters or something similar. Our gps outputs lat, long, altitude which we need to translate, obviously, but I was just wondering if anyone could tell me the specific units the ekf is expecting.