Stefan Maus: They're equipped with very sensitive magnetometers that measure the direction and strength of the magnetic field and that altitude.

斯特芬•茅斯：科学家们采用非常灵敏的磁力计来测量地磁场的方向、强度及方位。

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Source effects vary with field periods, resistivity, source altitude and observation location.

场源效应受场源高度、信号周期、电阻率、测点距离等的影响。

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ESPI can measure the object, through forming a carrier pattern on the object surface (carrier pattern modulation), analyze the relation between displacement field and altitude of the object surface.

电子散斑干涉测量技术通过在被测物体表面产生干涉条纹(载频调制条纹)，分析位移场与物面高度之间的关系，可测量物面的形貌。

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The balloon then quickly gained altitude before the fire caused the gas canister to explode and it fell to the ground in a sugar cane field outside the village of al-Dhabaa, west of Luxor, an Egyptian security official said.

BBC: Egypt balloon crash: Two Britons and UK resident die