4d chart: Difference between revisions
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<div class="definition"><div class="short_definition">A [[chart]] showing the field of [[D-values]] (deviations of the actual altitudes along a [[constant- pressure surface]] from the [[standard atmosphere]] altitude of that surface) in terms of the three [[dimensions]] of space and one of time.</div><br/> <div class="paragraph">It is a form of a four-dimensional [[display]] of [[pressure altitude]]. The space dimensions are represented by D-value contours, and the time dimension is provided by [[tau-value]] lines. 4D charts are used primarily for relatively long-distance preflight planning over ocean areas. <br/>''See'' also [[S-values]].</div><br/> </div> | <div class="definition"><div class="short_definition">A [[chart]] showing the field of [[D-values]] (deviations of the actual altitudes along a [[constant-pressure surface|constant- pressure surface]] from the [[standard atmosphere]] altitude of that surface) in terms of the three [[dimensions]] of space and one of time.</div><br/> <div class="paragraph">It is a form of a four-dimensional [[display]] of [[pressure altitude]]. The space dimensions are represented by D-value contours, and the time dimension is provided by [[tau-value]] lines. 4D charts are used primarily for relatively long-distance preflight planning over ocean areas. <br/>''See'' also [[S-values]].</div><br/> </div> | ||
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Latest revision as of 15:57, 25 April 2012
4D chart[edit | edit source]
A chart showing the field of D-values (deviations of the actual altitudes along a constant- pressure surface from the standard atmosphere altitude of that surface) in terms of the three dimensions of space and one of time.
It is a form of a four-dimensional display of pressure altitude. The space dimensions are represented by D-value contours, and the time dimension is provided by tau-value lines. 4D charts are used primarily for relatively long-distance preflight planning over ocean areas.
See also S-values.
See also S-values.
