The Y axis is also in the plane of the equator, passing through extending from 90°W longitude (negative) to 90☎ longitude (positive)Īn example is the NGS data for a brass disk near Donner Summit, in California.The X axis is in the plane of the equator, passing through the origin and extending from 180° longitude (negative) to the prime meridian (positive) in WGS 84, this is the IERS Reference Meridian.In WGS 84, this is the international reference pole (IRP), which does not exactly coincide with the Earth's rotational axis The slight "wobbling" of the rotational axis is known as polar motion, and can actually be measured against an ECEF. The Z axis is the line between the North and South Poles, with positive values increasing northward.
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In WGS 84, this is center of mass of the Earth. The origin at the center of the chosen ellipsoid.The ECEF coordinate system has the following parameters: The ECEF coordinates (x, y, z) shown in relation to latitude and longitude The geocentric altitude is a type of altitude defined as the difference between the two aforementioned quantities: h ' = R- R 0 it is not to be confused for the geodetic altitude.Ĭonversions between ECEF and geodetic coordinates (latitude and longitude) are discussed at geographic coordinate conversion. The distance from a given point of interest to the center of Earth is called the geocentric distance, R = ( X 2 + Y 2 + Z 2) 0.5, which is a generalization of the geocentric radius, R 0, not restricted to points on the reference ellipsoid surface. Its most common use is in tracking the orbits of satellites and in satellite navigation systems for measuring locations on the surface of the Earth, but it is also used in applications such as tracking crustal motion. Learn more about Fitbit products and services at THE FITBIT APPThe Earth-centered, Earth-fixed coordinate system (acronym ECEF), also known as the Geocentric coordinate system, is a cartesian spatial reference system that represents locations in the vicinity of the Earth (including its surface, interior, atmosphere, and surrounding outer space) as X, Y, and Z measurements from its center of mass. MANAGE WEIGHT: Connect wirelessly to the Aria Wi-Fi Smart Scale to seamlessly track your weight, BMI, lean mass and body fat percentages, and to see your weight trends over time. SYNC WIRELESSLY: Fitbit trackers sync your stats to computers and 200+ leading devices so you can continuously track your progress without needing to plug in. STAY MOTIVATED: Get a nudge in the right direction with notifications that pop up when you’re close to reaching a goal or have already met one. SHARE & COMPETE: Connect with friends and family by sharing stats, sending direct-messages, and competing on the leaderboard or in Fitbit Challenges. SEE HOW YOU SLEEP: Set sleep goals in the app, and use a Fitbit tracker to monitor how much time you spent awake, restless or peacefully sleeping. Then get a visual picture of your progress with colorful, easy-to-read charts and graphs. SET & MANAGE GOALS: Create weight, nutrition and exercise goals, and start a food plan to stay on track. MEASURE HYDRATION: Quickly log your water intake to make sure you’re properly hydrated during workouts and throughout the day.
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See your meal history at a glance, and get nutritional insights. LOG FOOD FASTER: Easily log calories with our barcode scanner, calorie estimator, and expanded food database of more than 350,000 foods. Review resting heart rate trends to see when your fitness is improving. Identify trends, manage stress and see the results of your workouts.
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MONITOR HEART RATE: Use a Fitbit tracker with PurePulse™ to analyze heart rate graphs in the app. RECORD WORKOUTS: Use your Fitbit tracker to track your exercise, then check the app to see your stats, their impact on your day, and how your performance is improving. You can also control your music, get voice cues or use your phone’s GPS to map your routes. RUN SMARTER: Enhance runs, walks and hikes by using MobileRun to track your pace, time and distance.
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For all-day tracking of stats like calories burned, active minutes, and sleep, pair the app with a Fitbit tracker. TRACK ACTIVITY: Accurately record your steps and distance with MobileTrack when you carry your phone. Use the app on its own to track basic activity and runs on your phone, or connect with one of Fitbit’s many activity trackers and the Aria Wi-Fi Smart Scale to get a complete picture of your health-including steps, distance, calories burned, sleep, weight, and more. Live a healthier, more active life with Fitbit, the world’s leading app for tracking all-day activity, workouts, sleep and more.