# tapeline altitude

## French translation: altitude vraie

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GLOSSARY ENTRY (DERIVED FROM QUESTION BELOW)
 English term or phrase: tapeline altitude French translation: altitude vraie Entered by:

 15:00 Sep 20, 2011
English to French translations [PRO]
Tech/Engineering - Aerospace / Aviation / Space / Aircrafts
 English term or phrase: tapeline altitude "The indicated rotate airspeed for each takeoff run was converted to ground speed using the winds and temperature for the time of takeoff from the Environment Canada climatic database, the tapeline altitude of the airport and the density ratio." I have problem finding out what "tapeline" refers to. Thanks for the help!
 Local time: 22:12
 altitude vraie Explanation:;
Selected response from:

Marion Feildel
Turkey
Local time: 05:12
 Merci!4 KudoZ points were awarded for this answer

Summary of answers provided
3 +1altitude vraie
 Marion Feildel
3altitude géométrique
 FX Fraipont

20 mins   confidence:
altitude géométrique

Explanation:
"3. Standard Atmosphere
The concept of a standard atmosphere is required so that we can perform comparisons of
performance among different aircraft. On any given day it is likely that the atmosphere will not be standard. Consequently the results of flight tests would be different, even for the same aircraft, if the tests were performed on different days, say mid summer and mid winter. However these results can be reduced to conditions in a standard atmosphere and then compared.
The assumptions for a standard atmosphere are:
Assumptions:
1. The atmosphere is static (V = 0)
Then the differential form of Bernoulli’s equation is evaluated with V = 0. The result is the
aero-hydro static equation:
(1) where D = density
g = acceleration due to gravity
hG = geometric (tapeline) altitude"
http://www.dept.aoe.vt.edu/~lutze/AOE3104/standardatmos.pdf

"Les altitudes données ci-dessous sont géopotentielles.

Dans l'étude de la répartition de la pression dans l'atmosphère, il est préférable d'introduire le potentiel de la force de la pesanteur (géopotentiel), qui définit l'énergie potentielle d'une particule d'air située en un point donné.
Le mètre géopotentiel normal (m'), qui équivaut à 9.80665 m²/s², est adopté par l'Organisation Météorologique mondiale.
En désignant par r le rayon terrestre fictif (6 356 766 m) les équations de translations entre l'altitude géométrique (h) et l'altitude géopotentielle (H) sont :"
http://www.aviation-fr.info/dom/dominique19.php

 FX FraipontBelgiumLocal time: 04:12Native speaker of: FrenchPRO pts in category: 428
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28 mins   confidence: peer agreement (net): +1
altitude vraie

Explanation:
;

Example sentence(s):
• Altitude vraie [ True Altitude ] L’altitude vraie est mesurée en référence au niveau moyen de la mer, lorsque l’altimètre est ajusté précisément à la pression barométrique du lieu.
• Tapeline altitude, or true altitude, is the linear distance above sea level and is determined by triangulation or radar.

Reference: http://www.talisman-illustration-design.com/turbulence/pages...
Reference: http://www.spaceagecontrol.com/USNTPS-FTM-C2.pdf
 Marion FeildelTurkeyLocal time: 05:12Native speaker of: FrenchPRO pts in category: 19
 Merci!

Peer comments on this answer (and responses from the answerer)
agree  GILOU: altitude réelle
 1 min
-> merci Gilles. Je penche plutôt pour "altitude vraie" mais l'un et l'autre se disent, j'ai l'impression.
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