Elevation EditorUse this command to open the Grading Elevation Editor tab in Panorama. From here, you can perform a number of edits while viewing all of the feature line data at once.
Insert Elevation PointUse this command to create one or more elevation points on a feature line.
Delete Elevation PointUse this command to simplify a feature line by removing elevation points from it.
Quick Elevation EditUse this command to interactively edit the elevations and slopes of a feature line. The command uses tooltips to show you elevations, slopes, and slope directions.
Edit ElevationsUse this command to edit individual points and segments on the command line.
Set Grade/Slope Between PointsUse this command to set a constant grade through multiple points. You do this by specifying a start point and an endpoint, and the command calculates the elevations of any points in between.
Insert High/Low Elevation PointUse this command to have Civil 3D
calculate a high or low point on a feature line. You do this by selecting two points and specifying the slope that should be projected from each point. Civil 3D will then calculate the intersection of the two slopes and create a point at the correct location and elevation. This command is especially useful for setting high and low points along curb lines to control drainage.
Raise/Lower By ReferenceUse this command to adjust all of the elevations of a feature line simultaneously by specifying a reference point and an elevation difference.
Set Elevation By ReferenceUse this command to calculate the elevations of individual points on a feature line by specifying a reference point and elevation difference for each point.
Adjacent Elevations By ReferenceUse this command to project the
elevations from one feature line to another while providing an elevation difference, if desired. This command is especially useful for parallel feature lines such as curb lines or wall lines.
Grade Extension By ReferenceUse this command to calculate the elevation of a point on a feature line by extending the grade of another feature line.
Elevations From SurfaceUse this command to project a feature line onto a surface. This command has the option to create elevation points at locations where the feature line crosses triangle edges in the surface.
Raise/LowerUse this command to edit all of the elevations of a feature line simultaneously by providing an elevation difference.- Open the drawing named Editing Feature Line Elevations.dwg located in the Chapter 17 class data folder.
- Click any feature line in the drawing. If the Edit Elevations panel is not visible, click Edit Elevations on the ribbon.
- Click Quick Elevation Edit. Place your cursor over the north corner of lot 25. The elevation on the tooltip should read 189.297' (57.695m).
- Place your cursor at each corner of lot 25 and take note of the elevations. The highest elevation is the south corner, which is at 190.456' (58.027m). The goal is to make sure that water flows away from the building pad (the blue rectangle). To do this, you will place the building pad at an elevation slightly higher than the highest lot corner.
Your Pad or Mine?
For land development projects that involve buildings, it is common for the contractor to prepare a flat area where the building will be placed. This is often referred to as the building pad. In a residential development such as the example in this book, a building pad is often prepared for each lot to accommodate the home that will be built. - Press Esc twice to end the current command and clear the feature line selection. Click the building pad feature line of lot 25.
- On the ribbon, click Raise/Lower By Reference. You will be prompted to specify a reference point.
- Invoke the Endpoint object snap and place your cursor on the south corner of lot 25, but do not click the mouse.
- Look at the coordinate readout in the lower-left corner of your screen. If the third value in the coordinate readout is 0.0000, press the Tab key. Keep pressing the Tab key until the value reads 190.4564 (58.027), as shown in Figure 17.6. The Tab key allows you to toggle between the parcel geometry, which is at elevation zero, and the feature lines, which are at true design elevations.
Figure 17.6 Using the Tab key and coordinate readout to select the correct elevation. - With the proper value shown in the coordinate readout, click the point to snap to it. You will be prompted to specify a point on the building pad feature line.
- Click the south corner of the building pad feature line. When you’re prompted to specify the grade, type 2 and press Enter. This places the building pad at an elevation that creates a 2 percent downward slope from the south corner of the building pad to the south corner of the lot. All of the other slopes will be steeper because the other lot corners are lower than the south corner.
- Press Esc to clear the previous selection. Click the feature line that represents the rear of the lots, and then click Elevations From Surface on the ribbon. The Set Elevations From Surface dialog box opens.
Tips:Notice that there are only five square grips along the rear lot line. We’ll take a look at this again after the next few steps.
- Verify that EG is selected and that the box next to Insert Intermediate Grade Break Points is checked. Click OK.
- At the command line, type P and then press Enter to invoke the Partial option.
- Select the feature line representing the rear of the lots. You will be prompted to specify the start point.
- Click the west corner of lot 25, and then click the south corner of lot 26 to specify the endpoint. A series of green circle markers will appear on the feature line.
- Press Enter to complete the command. There are now a number of circular grips visible on the feature line (see Figure 17.7). These represent additional elevation points that were required for the feature line to match the surface precisely.
Figure 17.7 Circular grips mark elevation points added to match the feature line to the surface.
- Using Edit Geometry Commands
- Using Edit Elevation Commands
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