Lot Setbacks

TPC can compute and draw lot setback lines automatically.  This is a simple tool that draws the offsets based on pre-defined setbacks for each traverse. It does not create any survey points, just lines in a drawing. You can still use the COGO R-O-W Offset tool if you need to generate survey points or if the automatic setbacks can't do a particular setback you want.

There are three parts to using automatic setbacks.

  1.  Telling each traverse what setback distances to use for Front, Side and Rear lot lines
  2. Identifying which lot lines are Front, Side and Rear
  3. Specifying the line type and color to use when drawing the setback lines

Once these three parts are in place, TPC draws the lot setbacks for you when it generates the drawing.

Setbacks Layers

If you include setbacks in a drawing, TPC places the setback lines on the TPCLotSetbackLines layer.  This is a special TPC survey layers, just like TPCPointSymbols and TPCLines. TPC manages this layer and uses it to draw lot setback lines.

Lot / Parcel Traverses

Lot setbacks only apply to Lot/Parcel traverses. These are traverses that you have placed in either the Lots or Parcels traverse group. Once a traverse has been placed in this group, TPC allows you to edit setback, location and LandXML parcel data for that traverse.

Editing Lot Setback Distances

You can now edit the Front, Side and Rear setbacks for your survey and for individual traverses.

Specify the setbacks to use for each survey in the Survey Information dialog. Traverses in this survey will use these survey setbacks as their defaults until you change them to something else for an individual traverse. So if the subdivision you are working on specifies 25' front, 10' side and 5' rear setbacks, enter these as the survey's setbacks and each traverse will start with these values. Then, modify the setbacks as required to accommodate any variances for special right-of-ways or easements.

You edit the setbacks for an individual traverse in it's properties dialog.

Then left click the Setbacks tab and enter the setback distances for that traverse.

Editing Lot Setback Distances for Multiple Traverses

To update the setback distances for multiple traverses at once,

  1. select the traverses you want to modify in the Traverses Manager
  2. left click one of the selected traverses and choose Traverse Properties
  3. In the Setbacks dialog, enter the setback distances you want and choose OK

TPC applies these setback distances to each of the selected traverses and updates the current drawing.

Specifying Lot Setback Types

Each lot line in a Lot/Parcel traverse has a setback type of Front, Side or Rear. The setback line type corresponds to the setback distance specified for that traverse. So if you specify a particular lot line as a Front setback, TPC will apply the Front setback distance when computing the location of the setback line.

By default, traverses set all setback types to Side. You can then change individual lot lines to Front or Rear as needed.

Traverse View

You specify the setback type for each traverse line in the Traverse View by including the Setback Type column in the display sequence. Then enter Front, Side or Rear in that column. You can also enter just F, S or R. Select multiple items in the Traverse View and enter the setback type for just one and TPC will update the setback type for each selected item.

Drawing View

You can also specify lot setback types by clicking objects in a drawing. These setback commands let you select multiple objects at a time.

Editing Lot Setback Traverse Drawing Settings

To draw the setback lines, you specify a line type, line width and color in the Lot Setbacks tab of the Traverse Drawing Settings dialog.

COGO R-O-W Offsets

You can still use the R-O-W Offset tool for special setback conditions.

The automatic lot setback tools do not create survey points, they just draw the setbacks. So if you need to stake the setback lines, you use the COGO R-O-W Offset tool to create the setbacks or use any of the many COGO tools available to create the location of any position on any setback line.

Related Topics

COGO R-O-W Offsets
Traverse Setbacks

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