Niels Sangmager - the photographer had to get really close on this shot since there's no zoom lens on a camera phone.

Niels Sangmager—摄影师非得十分靠近拍摄不可，因为手机摄像头不带变焦镜头。

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So, in the course of photogrammetry job, it is necessary to calibrate the close shot metric camera, and it is an essential job course to demarcate the digital camera.

因此，在摄影测量的作业过程中，有必要对近景摄影机进行检校，对数码相机的标定是一项必不可少的作业过程。

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