[Video] Using Pressure Data to Approximate Location

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In this quick video I demonstrate how we can use pressure data from the transportation monitoring example covered in my post "What Really Happens to Your Package During Transportation" to approximate the truck's location.

Going into the test I wasn't expecting to be particularly interested in either temperature or pressure; I was more focused on vibration.  But when I had a look the pressure data I noticed something pretty interesting.  It shows the elevation change and corresponding drop in pressure when the truck was driving through the middle of the country!  From the UPS tracking information, the box traveled through Spokane on the way out to Seattle; and on the way back it went through Portland.  This means that it likely traveled through the more northern portion of the Rocky Mountain range on the way out which is less in elevation as shown in Figure 1.


GALLERY - Click to enlarge images  

USA-topographical-map UPS-Cross-Country
Figure 1: A topographical map of the US is shown next to the assumed route (based upon UPS tracking information) of the enDAQ sensor (formerly Slam Stick) during shipment. The plot calculates the elevation based upon pressure data and default sea level pressure and temperature values.

If we calculate the elevation from the pressure data (see Mide's pressure-altitude calculator for more information - Note: enDAQ is a division of Mide), as shown in Figure 2, you can clearly see the much larger spike in elevation for the second half of the shipment.  This matches up nicely with the topographical map of the US and assumed route, pretty cool!

elevation-ups-ground-cross-country
Figure 2: The plot calculates the elevation based upon pressure data and default sea level pressure and temperature values.  The dashed red lines represent time periods without any pressure samples so the corresponding elevation is interpolated.

Conclusion

Thank you for joining me in my first foray into video blogging, hopefully you enjoyed it!  If you liked what I covered, please subscribe to our engineering blog for future discussions, and let me know if there is anything in particular you would like me to post about.  

I also encourage you to download the data (click here data download page) and do your own analysis.  

Lastly, check out our free 70 page Shock & Vibration Testing Overview eBook.  In there are some examples, background, and a ton of links to where you can learn more.  And as always, don't hesitate to reach out to us if you have any questions!

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Steve Hanly

Steve is the Vice President of Product at Mide. He started out at Mide as a Mechanical Engineer in 2010. He enjoys getting his hands dirty to do some...

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