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Drawing Objects Drawing objects are AutoCAD® software entities such as lines, blocks, and even text. DEMs can often be found alongside large-scale mapping data and are typically only accurate enough for rough analysis or calculations. DEM Files DEM stands for digital elevation model, and it is typically associated with large-scale mapping that has relatively low accuracy.
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Contours Usually, we think of contours as the end product of building a surface, but they can also be used as a source of data for a surface. In this way, they help to define “hard edges” such as edges of embankments, curb lines, ditch lines, and so on. Breaklines Breaklines force TIN lines to align with them. Another type of boundary can keep a surface out of an interior area, like a pond or building. A boundary around the edge of a surface can keep it contained within a certain area. The following list describes each one briefly: Boundaries Boundaries are used to control where the surface is. This way of studying the surface gives a real sense of the surface as a “solid” model in which the area inside the triangles has “substance.” It is also a great visual representation of the TIN algorithm and the surface model (see Figure 4.5).įigure 4.5 A surface shown using the Conceptual visual style.Īs shown in Figure 4.3, you can use many potential types of information to create a surface and control its shape.
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Change the visual style of the lower-right viewport to Conceptual, and look at the model from several different viewpoints.The appearance of the surface will change to show the TIN lines.įigure 4.4 Changing the visual style to 2D Wireframe within the lower-right viewport. In the lower-right viewport, click Shaded and select 2D Wireframe as shown in Figure 4.4.Tips : The difference in appearance between plan view and 3D view is a function of the surface style. The surface is now visible in plan view in the form of contours and shaded 3D faces in the bottom-right 3D view. Right-click Point Groups and select Add.Study the items listed beneath EG in the tree (see Figure 4.3).įigure 4.3 The contents of a surface shown in Prospector. In Prospector, expand Surfaces EG Definition.Click OK to dismiss the Create Surface dialog box. For Style, select C-Existing Contours (1') ( C-Existing Contours (0.5m)).Tips : The EG stands for existing ground. In the Create Surface dialog box, enter EG in the Name field.On Prospector, right-click Surfaces and select Create Surface.Open the drawing named Create an EG Surface.dwg located in the Chapter 04 class data folder.The Exercise File can be downloaded at the end of the article