摄影方法量测结构面产状的灭线法和灭点推导法

Vanishing line method and vanishing point deduction method for photographic survey of strike-dip of structural surfaces

在概述岩坡结构面产状摄影测量方法的基础上,提出了灭点推导法及其计算公式,并对灭线法作了进一步说明.这两种方法依据中心投影灭线和灭点的原理推导.应用这两种方法,在野外产状测量时,须进行方位的控制,而不需要任何长度和高度的控制测量;在内业中也不需要计算任何空间点位置,从而可以减少控制测量工作,增加了摄影外业的灵活性.因为提高了拍摄的灵活性,减少了像片量测的过程,可以提高产状测量的精度,适合于在地质编录摄影中应用.

Based on a summary of the methods for photographic survey of strike-dip of structural surfaces on rock slopes, the vanishing point deduction method and its calculation formula are proposed, and the method of vanishing line is further illustrated. Both methods are deduced from the principles of vanishing point and vanishing line of perspective geometry. With the two methods, only the direction control is needed for field survey of strike-dip, without requirement of any control survey in length and altitude. For the in-house survey, there is no requirement for calculation of the location of any spatial points. Thus, the workload for control survey is reduced, and the flexibility of photograph is improved. With the high precision in strike-dip survey, the method is suitable for geological photo logging.