摘要：Conceptual design, data model and key techniques of "geo-engineer 3D assistant", an underground 3D GIS oriented to geology and mine application, were discussed. In particular, the importance of high-order smoothing triangular pieces to surface's fine expression in geological modeling was emphasized. The contour mode is the most favorite mode of the three modes about surface expression: DEM, TIN and contour. Topology in underground 3D modeling with CAGD was compared. From the view of boundary and coboundary, which is soul of IS 19107 (geographic information spatial schema), 3D underground topology was re-examined.

摘要：A monitoring scheme must be so designed that several possible mod-els can be efficiently separated in the stage of analysis of deformation *** on the concept of separability developed by Chen and Chrzanowski,a methodology for the design of monitoring schemes has been developed by the *** the method a computer simulation technique is employed,into whichsome rules have been elaborated allowing minimal human *** this pa-per the criterion is first presented and the design technique using the step one up-dating procedure is ***,design of a simulated monitoring networkis made as a demonstrating example.