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I am currently processing some GPS data I collected on the Big Island
recently and will have some interesting height results to present in a
day or two.
-- Richard Langley

Quoting Hewitt Schlereth :

> Gosh, Frank, sorry about the wrap problem. Just call me Typhoid Huey. :-)
>
> I suspected my GPS because whenever I used it on boat trips in St
> John, it always had us 15 to 20 feet underwater.
>
> Hewitt
>
>
> Sent from my iPad
>
> On May 15, 2013, at 2:01 PM, "Frank Reed"  wrote:
>
>>
>> Yes, Hewitt, I am sure you're right. It's getting the altitude data
>> from an underlying topographic map.
>>
>> And you can do very much the same thing in Google Maps on Android
>> (I haven't found a way to do the same on iOS... maybe the
>> stand-alone Google Maps app?). No specialized app is required, but
>> you have to add a feature that's in beta to see it. Go into the
>> main menu of Google Maps (on Android smartphones and tablets),
>> select "Settings" and then "Labs". Add the "Measure" tool. This
>> does a nice job calculating distances along paths that you can
>> create by tapping on the map. In addition it shows a detailed
>> altitude profile of the path, which is useful for hiking. If you
>> create a path that is very short, say, five feet long, then the
>> altitude profile is just the altitude at the start location. Works
>> very well!
>>
>> For the location you gave in La Jolla, Hewitt, Google Maps shows an
>> elevation of 118 feet (compared to 121 feet which you said the
>> "Elevation Chart" app provided). Those are close enough, I think. I
>> have experimented with some locations I know here on the island,
>> and the altitudes strike me as accurate, and they seem to agree
>> with high-quality topo maps. Certainly the altitude provided by
>> this system is much better than the usual GPS-derived altitude.
>>
>> -FER
>>
>> PS: I am aware that when other NavList members quoted back Hewitt's
>> message in email, the result was another unwrapped message. I will
>> see if I can get any clue on the underlying cause from this latest
>> example.
>>
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>> : http://fer3.com/arc/m2.aspx?i=124059
>
>
> : http://fer3.com/arc/m2.aspx?i=124061



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| Richard B. Langley                            E-mail: lang@unb.ca         |
| Geodetic Research Laboratory                  Web: http://www.unb.ca/GGE/ |
| Dept. of Geodesy and Geomatics Engineering    Phone:    +1 506 453-5142   |
| University of New Brunswick                   Fax:      +1 506 453-4943   |
| Fredericton, N.B., Canada  E3B 5A3                                        |
|        Fredericton?  Where's that?  See: http://www.fredericton.ca/       |
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