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What is the difference between the Standard Atmosphere and logarithmic pressure to height conversion?

April 26, 2017atmosphere conversion height logarithmic pressure standard

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What is the difference between the Standard Atmosphere and logarithmic pressure to height conversion?

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A. The IDV displays pressure surfaces by converting the pressure to a height in some reference system. There are two reference systems that come standard with the IDV – the U.S. Standard Atmosphere and a logarithmic conversion (also used in Vis5D). The U.S. Standard Atmosphere only computes conversions for pressures up to about 80 km.