单词	nadir point
释义	nadir point nadir point See: nadir. nadir point nadir point [′nā·dər ‚pȯint] (optics) photograph nadir nadir point i. The same as nadir ii. As it relates to aerial photogrammetry, it is the point where a plumb line dropped from the front nodal point pierces the photograph. This point is vertically beneath the exposure station. In the illustration, it is point N. Also called a photo nadir and a photo plumb point. MedicalSeenadir
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