Establishment of measurement network of displacement of buildings in urban area using GPS technique

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For making the VRS data, it is needed to use the data at electronic reference point by the Geospatial Information Authority of Japan. At the beginning of this project, the software for data acquisition was established. The accuracy has strong dependency on the distance between the standard GPS sensor and the GPS sensors at the measuring point. So, to get the accurate data, the virtual stand point was established using the data at the relatively-near multi standard points. The procedure for this matter was examined and established. Using the 8 GPS antennas, the virtual reference points cover the whole Tokyo area. Then the high accuracy of virtual reference data was confirmed. Then the significant advancement on the accuracy could be achieved on this project.