| 摘要 |
PROBLEM TO BE SOLVED: To provide a survey device having a simple configuration and capable of easily determining a position of an observation point relative to an object.SOLUTION: The survey device is a device for observing whether or not a visual axis viewing a position to be observed of an object from an observation point is present within a target view area. A view area of a hologram element is divided into a single central view area that is equal to an angle of the target view area, and a plurality of side view areas, and the hologram element retains an error mark pattern representing that the visual axis is not present within the target view area, for every side view area. |
