This option allows you to create Offsets to a Line
Select Show Options to display the Distance and Direction pulldowns. These let you determine what type of distanc and direction to use for the offset.
For example, if you choose a True direction and Geodetic distance, TPC will compute a North-South offset (explained below) along the True North-South meridian and display the geodetic offset distance to the line.
You have to option to offet to an existing line, which can be a tangent, curve or spiral. You also have the option to offset to a straight line, run through some point at some bearing/azimuth. You determine which by how you specify the line to offset to.
Enter the point labels that define the line you will be offsetting to or use the Line [>>] pick buttons to select a line from the current drawing. TPC displays abbreviated information about the line you have selected to the right of the Bearing field. You will at least know the radius and length if it is a curved line or spiral. TPC displays the inversed bearing of the existing line in the Bearing/Azimuth field. This can be a Grid bearing or True bearing depending on the Direction type you have selected for this dialog.
When you select an existing line, TPC computes the offset to the line regardless of whether it is a tangent, curve or spiral.
As opposed to offseting to an existing line, you can also offset to a bearing/azimuth passing through any point Think of this alternative as a offset to a straight line at any bearing/azimuth.
Enter the starting point of the bearing line in the From field and a Bearing/Azimuth. You can use an equation to enter the Bearing/Azimuth (i.e. 1..2 recalls the Bearing/Azimuth from pt 1 to pt 2).
Offsetting to True Lines PLSS
To compute the offset to a line of true bearing/azimuth, first select one of the 'True' directions from the Direction pulldown list. You may need to select Show Options to display the Direction list.
This is the point for which you are computing the offset. Use the [>] pick button to select the point from the current drawing.
Choose an offset direction. The default direction is perpendicular.
If you are computing North-South offssets to an East-West line in the Public Lands Survey System (PLSS), turn on the [x] Latitude Arc option. See Geodesic vs Rhumb lines. For PLSS offsets, you will also want to select the appropriate Distance and Direction types.
This is the point on the line where the offset intersects the line. You can save this point by labeling it and choosing Save.span lang="en-us"> Use the [>] pick button to select the point from the current drawing.
These are the computed values that tell how far and in what direction to go from the offset point to the point on line. The dialog also indicates whether the offset point is Left or Right of the line.
DDistance from the start of the line to the POL. If the offset point is behind the starting point of the line, the dialog displays “Behind Start” next to this value.
Choose Edit to enter a description and point symbol for the computed point.
You must select Save in order to save the computed point.
Adds the computed point to the ‘Point Plot’ traverse and the current drawing.
Choose Summary to add information about this offset to the current Report View. If you turned on the [x] Latitude Arc option, TPC includes the mean latitude of the line you are offseting to in the report.
View the offset graphically.
Closes the Offset to Line dialog and returns you to the previous view.
Creating Offsets to a Straight Line
Computing Offset Intervals for Posting Line
Entering Equations
Setting the Default Direction