What are the advantages of GPS measurement compared with traditional measurement methods?

1, short observation time: when the distance between each mobile station and the reference station is within 15KM, the observation time of the mobile station is only 1-2 minutes; When the real-time dynamic positioning mode is adopted, the observation of each station takes only a few seconds.

2. Interstation intervisibility is not required: GPS survey only requires standing above and opening, and interstation intervisibility is not required. This advantage can greatly reduce the cost and time of investigation.

3. Simple operation of the instrument: In observation, the surveyor only needs to set up the instrument, measure the antenna height and monitor the working state of the instrument, and other observation work is automatically completed by the instrument. After the measurement, you only need to turn off the power supply and put the receiver in place to complete the field data acquisition task.

4. It can provide global unified three-dimensional geocentric coordinates: GPS survey can accurately determine the plane position and geodetic elevation of the station at the same time. GPS leveling can meet the accuracy of fourth-class leveling.

5. High positioning accuracy: the relative positioning accuracy of GPS can reach 10-6m, 100-500km, 10-7m, 1000km within 50km. In the precise positioning of 300- 1500m project, the plane position error of the solution is less than 1 mm after more than1hour observation.

Baidu encyclopedia -GPS