Graphics Programs Reference
In-Depth Information
option is used, the feature line becomes an exact match to the terrain represented
by the surface.
Raise/lower Use this command to edit all the elevations of a feature line
simultaneously by providing an elevation difference.
Exercise 17.3: Edit Feature lines with
Elevation Commands
If you haven't already
done so, download
and install the files for
Chapter 17 according to
the instructions in the
Introduction.
In this exercise, you'll use the feature-line elevation-editing commands to place
the lot 25 building pad at the correct elevation and to make the back-lot lines for
lots 25 and 26 match existing ground elevations more closely.
1. Open the drawing named Editing Feature Line Elevations.dwg
located in the Chapter 17 class data folder.
The elevation on the
tooltip should read
189.297' (57.695m).
2. Click any feature line in the drawing. If the Edit Elevations panel isn't
visible, click Edit Elevations on the ribbon.
3. Click Quick Elevation Edit. Place your cursor over the north corner
of lot 25.
4. 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 water
flows away from the
building pad (the blue
rectangle). To do this,
you'll place the build-
ing pad at an elevation
slightly higher than the
highest lot corner.
Your Pad or Mine?
For land-development projects that involve buildings, it's 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 topic, a building pad is often prepared for each lot to accommodate the
home that will be built.
5. Press Esc twice to end the current command and clear the feature-
line selection. Click the building pad feature line of lot 25.
6. On the ribbon, click Raise/Lower By Reference.
7. When prompted to specify a reference point, invoke the Endpoint
object snap, and place your cursor on the south corner of lot 25, but
don't click the mouse.
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