Re: Elevation of observations
Alphonse POUPLIER (alphonse.pouplier@skynet.be)
Thu, 1 Jan 1998 17:43:04 +0100 (MET)
>From Alan Pickup:
>>" A typical example (unfavorable): A satellite "flying" at 350 Km.
>>" The maximal difference between an elevation of zero and 1000 m
>>" is 0.084 degrees for the altitude over the horizon...!
>>
>
>But...observers of satellite positions strive for greater accuracy than
>this. For such observations to have maximum utility in analyses, the
>provision of observing site coordinates (which include the altitude
>above sea level) to better than 1km is justified.
Do they also take into acount the atmospheric refraction?
>To turn you argument around, why do you and others supply your longitude
>and latitude to an accuracy of 1 second of arc when (taking your sig as
>an example) this equates to 31m in latitude and 20m in longitude?
It had been given by my GPS.
But I agree that such an accuracy is not needed at all and you'll see
that I rounded it to the nearest minute.
My pleasure, avec plaisir, Alphonse URL:http://users.skynet.be/alphonse/
Wepion +50d25m 4d52m East. Parfois: Esparron +43d44m 5d58m
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