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Select the Apply button the surface will be triangulated now with the inferred breaklines.The inferred breaklines will be added to the surface.  Note: Generating Inferred Breaklines is only available when there are Contour point types loaded into the surface. The Generate Inferred Breaklines dialog will appear. From the InRoads pull down menu select Surface > Utilities > Generate Inferred Breaklines.Select the Apply button the surface will be triangulated.The Triangulate Surface dialog will appear From the InRoads pull down menu Surface > Triangulate.Select the Apply button Select OK to use elements contained in selection set.Feature Style: Contour (if available or similar feature style name).From the InRoads pull down menu File > Import > Surface.

Select the contours using a MicroStation selection set.Import From Graphics – Contour Point Type This workflow will show you the best way to create a DTM from just contours. Your job is to create a DTM that will match contours in the drawing. It is still common that you are given a file with just contours, no spot elevations and no breaklines.