Survey system
A survey system including a movable photographing device, a surveying device, and an analysis device. The movable photographing device includes a camera mounted on a UAV and taking a plurality of images P for photogrammetry, and a GPS unit including a first time stamping portion stamping a first time Tc relating to a photographing time on the image P taken. The surveying device determines a position of the movable photographing device, and includes a second time stamping portion stamping a second time Tt relating to a surveying time on a survey result R determined above. The analysis device includes a photographing position analysis portion associating each survey result R with a photographing position of the respective image P based on the first time Tc and the second time Tt, and generating data for photogrammetry.
1. A survey system comprising:
a movable photographing device including
a movable body,
a photographing portion taking a plurality of images for photogrammetry,
a first time stamping portion receiving a global positioning system (GPS) signal containing time information from a GPS satellite and stamping a GPS time based on the GPS signal as a first time relating to a photographing time on the plurality of images taken by the photographing portion, and
a photographing memory portion storing the plurality of images on which the first time is stamped;
a surveying device including
a surveying portion including an electro-optical distance meter, a horizontal angle detection portion, and a vertical angle detection portion, the surveying portion automatically tracking the movable photographing device, and determining a position of the movable photographing device,
a second time stamping portion receiving a GPS signal containing time information from a GPS satellite and stamping a GPS time based on the GPS signal as a second time relating to a surveying time on a survey result obtained by the surveying portion, the survey result including a slant distance, a horizontal angle, and a vertical angle with respect to the movable photographing device, and
a survey memory portion storing the survey result on which the second time is stamped; and
a photographing position analysis portion
associating, based on the first time and the second time, a photographing position of the movable photographing device calculated from the survey result with a photographing position of each of the plurality of images taken by the movable photographing device, and
generating data for photogrammetry.
2. The survey system of claim 1 , wherein
the surveying portion of the surveying device
determines the position of the movable photographing device by a predetermined surveying period shorter than an interval between photographing operations conducted by the photographing portion; and
after the movable photographing device completes all the photographing operations, the photographing position analysis portion
obtains, from the movable photographing device, each of the plurality of images on which the first time is stamped, and
obtains, from the surveying device, each survey result on which the second time is stamped,
associates the survey result on which the second time matching the first time is stamped with the respective image, and
generating data for photogrammetry.
3. The survey system of claim 1 , wherein
the movable photographing device
includes a communication portion capable of communicating with the surveying device, and
sends information about the first time stamped on an image through the communication portion every time the photographing portion conducts a photographing operation; and
the surveying portion of the surveying device
determines the position of the movable photographing device by a predetermined surveying period shorter than an interval between photographing operations conducted by the photographing portion,
receives the information about the first time, and
holds only a survey result on which the second time matching the first time is stamped.