---------- Forwarded message ----------
Date: Thu, 24 Sep 1998 09:40:59 +0100
From: Darius Bartlett <[log in to unmask]>
To: Maps and Air Photo Systems Forum <[log in to unmask]>
Subject: Re: more details to mean sea level, Alicante
At 14:08 23/09/98 -0400, you wrote:
>---------- Forwarded message ----------
>Date: Wed, 23 Sep 1998 16:35:48 +0100
>From: Darius Bartlett <[log in to unmask]>
>To: Maps and Air Photo Systems Forum <[log in to unmask]>
>Subject: Re: details to mean sea level, Alicante: reply
>
>At 09:36 23/09/98 -0400, Andrea Hausold wrote:
>>---------- Forwarded message ----------
>>Date: Wed, 23 Sep 1998 09:16:39 +0200 (DFT)
>>From: "A. Hausold" <[log in to unmask]>
>>To: [log in to unmask]
>>Subject: details to mean sea level, Alicant
>>
>>Dear members of the list,
>>
>>first of all thanks a lot to all who have already responded to my request
>>and gave hints.
>>
>>On reading the answer of Darius it seems that I might be on the wrong
>>track. If you do not mind, I would like to explain want I am planning to
>>achieve. Maybe you then have even more advise for me?
A (probably) last word from me on this: I took the liberty of forwarding
Andrea's request to Cliff Mungier at the University of New Orleans (who
I mentioned in my last message). This is his response. If there is any
discrepancy between my replies and his (though I didn't see any), I readily
defer to his far greater experience and knowledge of such matters.
Cliff said:
>Everything [in Andrea's original query] relates to the geoid separation
>between the terrain
>elevations (geoid) and the ellipsoid. Vertical datum differences are
>not as important, but the conversion between the two (per his question)
>is with respect to Amsterdam, the mark "NAP 1684" ... (yes, the date is
>correct) being zero gives Alicante as (minus is correct) " - 249
>millimeters. "
>
>This may be enough, but I doubt short e-mail notes will solve this guy's
>problem. The Spanish Military 1:50,000 topo maps are European Datum
>1950 and referenced to the International 1924 Ellipsoid which is
>synonomous with the Hayford 1909 ellipsoid.
>
>This guy needs a real geodesist, (Germany is FULL or them!), and I think
>he's over his head ...
HTH,
Darius
************************************************************************
Darius Bartlett Darius Bartlett
Department of Geography Roinn na Tireolaiochta
University College Cork Colaste na hOllscoile Corcaigh
Cork, Ireland Corcaigh, Eire
Phone: (+353) 21 902835 Fax: (+353) 21 271980
Mobile: (+353) 86 8238043
E-mail: [log in to unmask] Web URL: http://www.ucc.ie/ucc/depts/geography/djb
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