A new 3D laser-scanning and GPS combined measurement system
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Abstract:
Terrestrial laser scanning (TLS) is widely used because of its ability to quickly acquire high-density and high-precision 3D image and topographic data. However, it can only acquire independent coordinate system points, which restricts its application in large-scale deformation monitoring. In this study, we constructed a measurement system to acquire global coordinate point cloud data by combining TLS and GPS (Global Positioning System). The coordinate values of retro-reflective targets could be acquired in different coordinate systems, the GPS coordinate and the TLS station coordinate, synchronously. Our experiments showed that, after registration with the homonymy points acquired by 30-min short-baseline differential GPS using the ICP algorithm, the positional accuracy of the TLS retro-reflective target center in the global coordinate was better than 10 mm. This high precision meets, for instance, the requirements of coal mining subsidence monitoring. We used our new combined measurement system to acquire and process the point cloud data of a frame structure. The measurements demonstrated the practicability and robustness of the new measurement system.Keywords:
Robustness
Precise Point Positioning
Laser Scanning
Geographic coordinate conversion
In order to put the SDCORS datum station coordinates into the ITRF2008 coordinates frame and meet the requirements of the CORS station network's construction.This paaper uses the GAMIT/GLOBK software and take the effection of earth tide,ocean tide,atmospheric tide and polar tide into consideration to process the observation data of the SDCORS in 2012.We get the millimeter level accuracy of the coordinates and velocities of the SDCORS datum stations,and analysis the changing characteristics of these stations.Finally,we built a regional dynamic coordinates reference frame which is applied in Shandong province.
Geographic coordinate conversion
Geographic coordinate system
Frame of reference
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Over the years, Global Navigation Satellite Systems (GNSS) have been established in the geosciences as a tool that determines the positions of discrete points (stations) on the Earth’s surface, on global to local spatial scales in a very simple and economical manner. Coordinates obtained by space geodetic measurements ought to be processed, adjusted, and propagated in a given reference frame. As points on the Earth’s surface do not have a fixed position, but rather, are moving with associated velocities, it is inevitable to include those velocities in the coordinate transformation procedure. Station velocities can be obtained from kinematic models of tectonic plate motions. The development and realization of an all-in-one standalone desktop application is presented in this paper. The application unifies coordinate transformation between different realizations (reference frames) of the International Terrestrial Reference System (ITRS) and European Terrestrial Reference System 1989 (ETRS89) following European Reference Frame Technical Note (EUREF TN) recommendations with temporal shifts of discrete points on the Earth’s surface caused by plate tectonics by integrating no-net rotation (NNR) kinematic models of the Eurasian tectonic plate.
Frame of reference
Position (finance)
Geographic coordinate conversion
Precise Point Positioning
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