Pro Altimeter - Barometric+GPS 4+

Name: Pro Altimeter - Barometric+GPS
Price: 0.99 USD
Rating: 4.1 (33 reviews)
Author: Craig Hunter

Craig Hunter

- 4,1 • 33 đánh giá

- 0,99 US$

Miêu tả

Pro Altimeter uses the high-fidelity barometric pressure sensor in iOS devices to measure and compute altitude.

Pro Altimeter has a dead simple interface. Barometric altitude and GPS altitude are displayed in large easy to read numbers, showing units of both feet and meters, and giving realtime accuracy estimates from the hardware. At bottom are calibration and display mode buttons. The display offers a highly-readable daytime mode with black digits on an LCD-green background, and a reversed night mode that is easy on the eyes in dark conditions. That's it!

Proper calibration is necessary to measure altitude from barometric pressure (this is why a pilot "dials in" the cockpit altimeter before taking off). Pro Altimeter offers four different methods for calibration -- choose the easiest and most convenient:

1. Use GPS altitude. This method correlates the measured local barometric pressure with the altitude measured by GPS. This method can be used when your device has a clear line of sight to the sky and a reliable GPS fix with good accuracy.

2. Manually enter altitude. This method correlates the measured local barometric pressure with known altitude from landmarks, elevation benchmarks, trail markers, topo maps, land surveys, etc. Altitude can be entered in feet or meters.

3. Manually enter pressure. If you have a weather station, weather report, or METAR report with equivalent sea level pressure for a nearby location, this can be used to correlate local barometric pressure to altitude. Pressure can be entered with units of inches Hg, kPa, or mb.

4. Check local airports. With the tap of a button, Pro Altimeter will locate the five closest airports within 100 miles (160km) of your present location anywhere in the world, and pull in METAR data. From that list of five, pick the airport of your choice and Pro Altimeter will import pressure data for calibration.

Once calibrated, Pro Altimeter keeps track of the time since its last calibration. Because weather and local barometric pressure change over time, the app will warn you when 6 hours have elapsed since the last calibration by flashing the "CALIBRATE" button. You should calibrate as frequently as practical -- for example, on a hike, calibrate whenever you pass a trail marker or elevation benchmark. But at a minimum, calibrate at least every 6 hours or whenever weather changes in your area.

Pro Altimeter is intended for iOS devices with a built-in barometric pressure sensor (iPhone 6 and later, iPad Air 2 and later, iPad mini 4 and later, and iPad Pro). On older devices without a barometric pressure sensor, only GPS altitude and accuracy will be displayed.

If you have an Apple Watch, check out the new Pro Altimeter for Watch and get all this same functionality on your wrist!

25 thg 3, 2024

Phiên bản 1.1.2

This version contains a workaround for privacy/permissions issues on iOS 17.4.x that block access to the barometric pressure sensor. You will be required to grant permission for access to Motion & Fitness activity. On devices that do not support Motion & Fitness, or in cases where the user declines permission to access Motion & Fitness activity, only GPS altitude will be shown in the app. Please contact support@hrtapps.com if you have any questions or concerns.

4,1/5

33 đánh giá

Pro Altimeter Update

This version of the App has effectively resolved an issue related to display on IPhone6. The app is easy to calibrate and read due to the larger text. Well worth the 0.99 cents.

This is what I was looking for!

While trying to determine elevations for setting multiple very sensitive digital barometers at different levels indoors, I used a combination of USGS topo maps, a couple of pressure equations, and moving up and down hill with a barometer to record pressure changes to predict estimated altitudes where the stationary barometers are. Pretty much had to work it out inside-out and in reverse. Then I happened to see this altitude app available in the Theodolite app (never came across it when searching the App Store, though), and it’s exactly what I was needing. I took it to an open spot outside where an online high-res USGS topo map showed 1,261 feet elevation, entered that as the calibration, then quickly took my phone to the barometer locations. Based on the app elevation readings, the difference between the predicted pressure and the values calculated using this app’s numbers showed that the prediction was only 0.08 millibars off, or within about 5 feet elevation. It was kinda cool to see how closely the reverse-engineering turned out to be, but I’d much rather have skipped all that nonsense and found this app a lot sooner.

Barometric???

Right now I fail to see how this is anything more than all the other GPS location barometer apps in the App Store. You can enter your local pressure, but it still only gives you GPS altitude on both my iPhone and Apple watch. Another barometer app I use reflects the actual local station pressure, so I am quite sure that the sensor in my iPhone is working properly.

Review Update:
I downloaded Pro Altimeter to both my iPhone 14 Pro and to my Apple Series 8 watch at about the same time that Apple updated their software which messed things up.
I am changing my star rating due to the quick response from the developer, which can be read below.

Apple introduced a major bug in iOS 17.4 which prevents the barometric pressure sensor from getting privacy permission to deliver data to apps. I filed a bug report in early March and am told they are working on a fix, but no timeline was given. Until they fix the problem, the only solution is to downgrade to iOS 17.3.x, which is not practical for most people. So we have no choice but to wait. Once Apple releases their fix, I will most likely need to update the app to make it reset privacy permissions so it can start getting pressure data under 17.4.x.

Nhà phát triển, Craig Hunter, đã cho biết rằng phương thức đảm bảo quyền riêng tư của ứng dụng có thể bao gồm việc xử lý dữ liệu như được mô tả ở bên dưới. Để biết thêm thông tin, hãy xem chính sách quyền riêng tư của nhà phát triển.