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THE MORE DISCUSSION TO THE MODELING UNCERTAINTY OF LINE PRIMITIVES IN GIS

Liu Dajie Hua Hui(The Surveying Department of TongJi University, Shanghai, 200092)  
On the basis of the paper、,this paper put forward a modified model for linear positional uncertainty. It considers two situations: One is that the two points of line are relevant and have different precision. The other is that distribution of error have certain direction. On the condition of that, it makes a more close and accurate εBand width. Through examples, it is proved that the accurate model is little different from, which is given in the paper、. When two points have the equal error, the model given in the paper 、 can be used into practice.
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