Creating Grade Limits

Grade limits define the area of topographical transition between existing site data and the site modifiers enclosed within the grade limits; they can be thought of as a “limit of construction.” Outside the grade limits, the site remains unchanged; within the grade limits, the site model is defined by the pads. Grade limits can overlap, but cannot completely enclose, another grade limit area. Grade limits should not cross a pad or spoil pile.

Grade limits are created automatically around certain site modifiers, such as massing models. Grade limits can also be created automatically from pads (Vectorworks Landmark required). To draw grade limits manually, use the Site Modifiers tool, or draw a polyline and then select the Create Objects from Shapes command (see Creating Objects from Shapes).

To create grade limits:

1. Click the Site Modifiers tool from the Site Planning tool set, and click Grade Limits mode from the Tool bar.

2. Draw the grade limit area around a site modifier, such as a pad.

 

The properties can be edited from the Object Info palette.

Click to show/hide the parameters.

Parameter	Description
Simplification Tolerance	Enter a positive value to redefine the horizontal distance between the closest parts of two neighboring portions of the modifier. A longer distance simplifies the modifier polygon, reducing the number of source points that modify the site model. A shorter distance increases the number of source points that modify the site model. A value of 0 (zero) does not simplify the modifier.
Modifier Vertex Count	Displays the number of vertices created by the site modifier to modify the site model
Config	Indicates the type of modifier object
Apply To	Specify whether the grade limits apply to the existing or proposed site model
Show 3D	In 3D views, represents the grade limits with a 3D polygon; deselect this option to hide this geometry
Update Calculations	Updates the area and volume calculations displayed in the Object Info palette for the area of the site model located under the site modifier
Site model area and volume data	Displays the area and volume information for the site model area located under the site modifier; select the units for the area and volume. For more information, see Site Model Properties.
Vertex parameters	Edits the path vertices; see Editing Vertex-Based Objects

3. To reflect the grade limit modification, select the site model and click Update from the Object Info palette.

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Creating Grade Limits Automatically

Updating a Site Model

Site Model Modification Overview

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