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B8S 精密立体测图仪是通过使空间导杆的方向和摄影光束方向一致的方法来实现恢复光束的。由于几何和物理方面的原因,要使空间导杆恢复与摄影时完全相同的光束方向是不可能的。但事实证明只要对仪器进行详细认真的检校是可以达到设计精度的。往往由于机械检校、调整不细致、作业人员作业工作中的疏忽大意,仪器的内外方位元素没有严格得到恢复,使 B8S 仪器的测图精度受到影响。其中摄影焦距和投影主距不等就是值得注意的一项。B8S 仪器通过一般检校后,虽然仍会产生摄影焦距与投影主距不等的情况,但一般这种误差属于偶然的性质。设 f_投-f_摄=δ_f≠o它对模型点的平面位置的影响是微不足道的。引起高程的偏差δ_h 与δ_f 成正比,其值可用下式表示。
B8S precision stereograph is through the direction of the space guide rod and photography direction of light beam to achieve the same method to restore the beam. Due to geometrical and physical reasons, it is not possible to make the spatial guide rod recover exactly the same beam direction as when photographing. But it turns out that as long as the instrument is carefully calibrated can achieve the design accuracy. Often due to mechanical calibration, adjustment is not detailed, the negligence of workers in homework, the instrument inside and outside the azimuth has not been strictly restored elements, so B8S mapping accuracy is affected. One of photography ranging from the focal length and the main distance is notable one. B8S instrument through the general calibration, although there will still be shooting focal length and the projection of the main distance range, but in general this error is accidental nature. Suppose f_tot_f_take = δ_f ≠ o It has negligible effect on the plane position of the model points. Deviation caused by the elevation δ_h and δ_f is proportional to its value can be expressed by the following formula.