The invention provides a surveying
system, which comprises a surveying instrument, wherein the surveying instrument comprises a measuring unit for performing a
distance measurement by projecting a distance measuring light toward an object to be measured and by receiving a reflected distance measuring light from the object to be measured, an image
pickup unit having an image
pickup optical axis running in parallel to a projection
optical axis of the distance measuring light and for picking up an image including the object to be measured, an attitude detecting unit provided integrally with the measuring unit and for detecting a tilt angle with respect to the horizontal of the measuring unit, a coordinates acquiring unit for detecting a position of the surveying instrument and an
arithmetic processing unit, wherein a first image of the object to be measured is acquired by the image
pickup unit from a first position where coordinates of the first position are acquired by the coordinates acquiring unit, a second image of the object to be measured is acquired by the image pickup unit from a second position where coordinates of the second position are acquired by the coordinates acquiring unit, wherein the measuring unit directs a distance measuring
optical axis toward common measuring points as specified in the first image and the second image respectively, projects the distance measuring light, and carries out a first
distance measurement from the first position and a second
distance measurement from the second position, and wherein the
arithmetic processing unit calculates horizontal distances from the first position and the second position respectively based on the tilt angles detected by the attitude detecting unit at the first position and the second position, on the first distance measurement and on the second distance measurement, and further the
arithmetic processing unit is configured to calculate a
base line length based on coordinates of the first position and on coordinates of the second position and to carry out a
trilateration with respect to the measuring point based on the horizontal distance and on the
base line length.