# 相對橢圓面積

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{{#category_index:R|relative ellipse area}}
In telluric surveying, electric-field vectors are observed at a field station ( and ) and also simultaneously at a base ( and ). The vectors are related to each other in linear combinations:

The determinant of this transform, , called the ‘‘relative ellipse area,’’ is a measure of the electrical properties at the station relative to that at the base.