相对椭圆面积

In telluric surveying, electric-field vectors are observed at a field station (Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle E_{u}} and $E_{v}$) and also simultaneously at a base (Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle E_{x}} and Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle E_{y}} ). The vectors are related to each other in linear combinations:

$E_{u}=aE_{x}+bE_{y}$

$E_{v}=cE_{x}+dE_{y}.$

The determinant of this transform, Failed to parse (MathML with SVG or PNG fallback (recommended for modern browsers and accessibility tools): Invalid response ("Math extension cannot connect to Restbase.") from server "https://en.wikipedia.org/api/rest_v1/":): {\displaystyle J=ad-bc} , called the ‘‘relative ellipse area,’’ is a measure of the electrical properties at the station relative to that at the base.

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