| A measurement mark. The construction of the triangular point or points on the wire frame. Wood, steel or other material built. Height from a few meters to tens of meters. High survey markers from the inside and outside the structure into. Installed outside the frame awarded to the top or string-shaped aperture plate cylinder, for horizontal angle or vertical angle observation awarded with time. Instrument placement within the frame to the top with the substrate (referred to as instrument sets. ") Low survey markers just outside the frame, the instrument is set on a tripod. |
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