Author Topic: Altitude vs Elevation  (Read 133 times)

Offline Gomario

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Altitude vs Elevation
« on: April 27, 2021, 19:00:07 »
Hello everyone. Did any of you notice that Locus Map (android app) confuses altitude with elevation? It displays the elevation data under the altitude name  ;D Not exactly professional but not a big issue either. Many people confuse the two terms to begin with...
A more relevant issue is the fact that Locus can not display the Altitude at all ! This is sad because many people like myself find Locus very useful, as a "all rounder" navigation tool (in the air and on the ground). And the program already has all the data it needs. To get the correct altitude it only needs to substract the actual gps map location altitude from the actual elevation.
 

Offline Menion

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Re: Altitude vs Elevation
« Reply #1 on: April 28, 2021, 20:28:25 »
Hello Gomario,
thanks for the feedback. Mistakes happen, so let's do something with it.

From what I understand, elevation is the distance between the ground/surface and reference plane (usually ellipsoid). Altitude is then the distance between the user position (above ground) and the reference plane. If this is correct, may you please point me to the place where it is incorrect in the app?

From your text, it looks like you use altitude as a distance between the user position (above ground) and the ground itself. It is usually called "height" isn't it?

Quick search and the second image I've found explain what I tried to describe above.

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Offline Gomario

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Re: Altitude vs Elevation
« Reply #2 on: April 29, 2021, 15:48:49 »
Thank you for replying.
I must add right at the start, after buying the Android application and testing it in my microlight, I was very impressed with the accuracy and usefulness thereof. More often then not it was just as good as my dedicated (and very expensive) Garmin system. Clearly, technology has improved a lot over the last 10 or so years.
Comming back to the topic: In aviation we do not talk about "Height". it is a very confusing term and it is best left out entirely. "Altitude" it is used instead. But Altitude on its own can be confusing too. Hence we refer to ASL (Altitude above Sea Level) or AGL (Altitude above Gound Level). When used on its own, most pilots will understand it as ASL but as I said, you better specify.
On the other hand Elevation is used when describing the vertical distance to some object on the ground (or to the ground itself, right under the plane)
Mind you, after playing a bit more with the program on my phone, I see that the names can be easily changed. So please ignore my previous post entirely. I am still learning this thing and now my display is correct.
Lastly I want to highlight how usefull this program is for a pilot. I know it is not meant for flying but if you have a cellphone with a build-in barometer and compass, this program is quite impressive! However, it needs a bit of refining. Probably the functions are already implemented but I don't know how to use them  :'( How can i display the Elevation (Height above ground)? And I would like to see the vertical speed in m/s or feet/min instead of Km/h. Other than that most things are already there (including the Heading and Course lines!!!) The program does make use of the Internal Barometer and Compass. And is surprisingly spot-on even without accounting for the southern hemisphere geodesic .
And lastly, is there a way to implement the LiveTrack24 API? (https://www.livetrack24.com/docs/api)
 
« Last Edit: April 29, 2021, 15:54:56 by Gomario »