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MicroStationJ to the data conversion method MapGis Research and Practice

Different kinds of graphics are saved as points, lines, clearly document. (5) application of the method of data conversion unit conversion program development have been carried out in production applications. In the application process has some notable issues: (1) conversion process for a certain distance curve is converted to a line string chord, if the curve a lot, given the smaller chord length, the converted document clearly points higher. Before the conversion,[link widoczny dla zalogowanych], should dgn graphics files into the curve in the line of string: first select the curve by attributes, use the \that the complete curve scatter. (2) conversion process for a complex series of deep and complex polygons without further processing, before the conversion required by the attribute selection \\(3) DGN file can not have the text \SURVEYING AND abscissa or ordinate equal to two points of intersection of Straight Lines of the accuracy of SURVEYING AND (1. Lishui College of Architecture,[link widoczny dla zalogowanych], Zhejiang Lishui 323000, China; 2. Chang'an University, to test, Xi'an 710054) StudyonPrecisionofIntersectionPointbetweenTwoStraightLinesthroughEqualTwoPointsinHorizontalorVerticalCoordinatesDengYonghe summary of a theory Question: If the two do not coincide, their coordinates and covariance are known, and the horizontal axis or vertical axis equal, than this cut-off points and a straight line can not determine the accuracy of the intersection. Tries to give a way to resolve the uncertainty, but theoretically still defective. There is no better way of handling it deserves the attention of survey data processing workers, the author of this article can only hope that the role of better ideas. Key words cut straight line intersection of accuracy in the transit line, the set does not overlap P. (., Y.),[link widoczny dla zalogowanych], P (, y2) the coordinates of two points has been obtained, and the horizontal axis or vertical axis equal, and P. , P the covariance matrix for the D = 2orXIXlO'ylXlo \P. The point is only determined whether the variance? Here for an example of X = X (to Y. = Y2 This study also obtain similar Received: 2007 About a O1-09: SURVEYING AND (1968 a), M, 1991, graduated from Xi'an Institute of Engineering Survey of Geology, postgraduate students,[link widoczny dla zalogowanych], senior engineer. ... ... ... ... ... ... ... ... a ... ● <0 one by one ... one ... ... ... ● (one by one} ● (. ... 0 'room with \understanding of the software, according to their need to use different software, which brings the problem to the data sharing. need to be resolved between the two data conversion software, a series of problems arise in order to reduce data conversion caused by data loss or data generated redundancy. By Mi-croStafionJ and MapGis Data Conversion between research and students 1 intersection coordinates of the four expressions and precision analysis of the intersection point of intersection P. coordinates of the four expressions for the (then B ≠ 0; otherwise , straight line and P. P parallel or overlap without research value.) x x production practice, the function of both the software and data organization have a deeper understanding.
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