Method for measuring national level control point using and visual information in geodetic surveying

A survey method is provided to improve reliability of national level reference points by storing characteristic information including visual information and a measuring point, the distance between a level device and a leveling rod, the leveling rod and a read value of the leveling rod. A survey method comprises the steps of: letting a leveling staff vertically stand a leveling rod toward a leveling device and an observing staff collimate the leveling rod(301); taking pictures of an observation point by using a photographing device mounted on the leveling device(302b); inputting a measuring point name in the acquired observation point images in a data processing device(302c); inputting a front view and a rear view(302d); extracting visual information and storing characteristic information including the visual information and a measuring point, the distance between a leveling device and a target staff, the target staff and a read value of the target staff in a storage device(302e); and correcting the stored visual information and the characteristic information, forming a level network by combining a plurality of measuring points, and calculating altitude by averaging measured result of the level network.