Chinese geodetic coordinate system 2000 |
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Authors: | YuanXi Yang |
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Institution: | (1) Xi’an Research Institute of Surveying and Mapping, Xi’an, 710054, China |
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Abstract: | The basic strategies in establishing the Chinese geodetic coordinate system 2000 have been summarized, including the definition
of the coordinate system, the structure of the terrestrial reference frame, the functional and stochastic models involved
in the realization of the reference frame as well as the improvements of the adjustment procedures. First, the fundamental
frame of the coordinate system is composed of the permanent GPS tracking network in China which is integrated into the international
GPS service stations by combined adjustment, in order to guarantee the consistence between the international terrestrial reference
system and the Chinese geodetic coordinate system. Second, the extended frame of the coordinate system is composed of the
unified 2000’ national GPS network which is integrated by 6 nationwide GPS networks with more than 2500 stations under the
controlling of the fundamental frame. Third, the densified frame is composed of national astronomical geodetic network with
nearly 50 thousand stations which was updated by the combined adjustment with the 2000’ national GPS network, thus the datum
of the national astronomical geodetic network has been unified and the precision greatly improved. By the optimal data fusion
method the influences of the datum errors, systematic errors and the outliers in the separated geodetic networks are weakened
in the unified Chinese geodetic coordinate frame. The significance in application of the new geodetic coordinate system and
the existing problems in the reference frame are described and analyzed.
Supported partly by National Natural Science Foundations of China (Grant Nos. 40774001 and 40841021) and the National High-Tech
Research & Development Program of China (Grant No. 2007AA12Z331) |
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Keywords: | Coordinate reference system reference frame geodetic control network datum adjustment |
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