Re: Altitude in meters above WGS-84 Geoid ?

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Earl Needham wrote:

>>Programs ask for altitude/elevation/height (I'll use all three so I won't
>>restart a thread about the 'proper' use of those terms) above mean sea
level
>>is that the common number end users have access to.  You're also right
that
>>the difference between the sea level datum and the spheroid datum makes no
>>practical difference: your 30 meter 'error' relative to a 6378 km earth
>>radius is one part in 200,000.
>
> So, just to be absolutely sure, I enter 4295 in the height block, because
>that's how high above seal level the ground is here, right?


Yes.  Sea level is good enough.  Don't worry about the geoid stuff (even
though it is interesting).

_____________________________________________________________
Jim Varney     121.398 W, 38.458 N, 8m     Sacramento, Calif.
Member, Sacramento Valley Astronomical Society

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