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《ACTA GEODAETICA ET CARTOGRAPHIC SINICA》 1999-04
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Uncertainty Model of Circular Curve Features in GIS

TONG Xiao hua 1,2 ,SHI Wen zhong 2, LIU Da jie 1 (1. Department of Surveying and Geomatics, Tongji University, Shanghai,200092; 2. Department of Land Surveying & Geo Informatics, The Hong Kong Polytechnic University,HongKong)  
This paper presents an uncertainty model for describing circular curve features with the variance covariance of an arbitrary point on the curve.The weighted average covariance formula of any point is deduced. The model, which is represented by root mean square in circular curve normal direction, is developed. And the model, which is represented by error in the maximum direction is defined. With a case study and visualization, it is proved that this model is theoretically rigorous for describing error of circular curve lines.
【Fund】: 国家自然科学基金;香港大学资助委员会研究基金
【CateGory Index】: P208
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