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On 15-01-2012 13:58, Thomas Knudsen wrote:
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<div class="gmail_quote">2012/1/14 Michal Seidl <span dir="ltr"><<a
moz-do-not-send="true" href="mailto:michal.seidl@gmail.com">michal.seidl@gmail.com</a>></span><br>
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- Mikael Rittri explanation helps me a lot, I was really for a
moment<br>
confused by Frank's one<br>
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<div>Mikael's clarification was, indeed, excellent and useful</div>
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- Joaquim formula h = H-N is OK. But as Frank said +geoidgrids
is only<br>
name and can be used for other height correction which is
exactly my<br>
situation.<br>
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<div>But please note that Wikipedia and leading geodetic
textbooks (Hoffmann-Wellenhof & Moritz: Physical Geodesy,
as well as Torge: Geodesy) use a different notation:</div>
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<br>
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<div>h: height above ellipsoid</div>
<div>H: orthometric height (which to an excellent approximation
is equivalent to the height above the geoid)</div>
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<div>Hence: h = N + H</div>
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So following Joaquim's suggestion of +H and +h options is
quite risky. Out of context you can never be sure what is
meant by H and h.</div>
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<div>/Thomas</div>
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<br>
Ai, this is embarrassing for me. Off course I mistakenly swapped the
H/h as it never crossed my mind going against the notation followed
by the "Physical Geodesy" bibles.<br>
<br>
Joaquim<br>
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