This option allows you to create points when your data is a specified distance along a line and then a given distance left or right.
Example: As a surveyor laying out a construction project, you might need to scale the distance along a property line to a point which is perpendicular to a catch basin and then scale the offset distance from the property line to the catch basin. The Distance-Offset option lets you enter the scaled information in order to create a coordinate point to be recalled into your stakeout notes.
You can specify what Distance and Direction types to use for this computation.
For example, if you select a Geodetic distance and True bearing then recall an existig line as explained below, the bearing displayed will be the inversed True bearing along the line and the Distance and Offset used to compute the new point will be Geodetic (ground) distances.
Enter the point labels that define the line you will be offsetting from 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 a line, TPC computes the distance along the line regardless of whether it is a tangent, curve or spiral, then computes the offset perpendicular to the line at that distance point./P>
As opposed to going some distance along an existing line, you can go a bearing and distance from any point, then compute an offset perpendicular to that bearing. Think of this alternative as a distance along a straight line at any bearing.
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).
To create a distance/offset along 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.
Enter the Distance along the recalled existing line or bearing/azimuth. This distance is always the distance from the point labeled 'From' in this dialog.
Enter the offset distance. Negative offset means left, Positive offset means right. Lefts and rights are relative to the direction of the line you are offseting from.
TThe position of the offset is computed, but you must assign it to a survey point that is stored with the survey. You can enter a new point point label, enter the label of an existing point to update it with the computed positin or use the [>] pick button to select an existing point from the current drawing.
To save the computed position you must give it a point label and choose Save.
Choose Edit to enter a description and point symbol for the computed point or protect its coordinates.
You must select Save in order to save the offset point you create.
Adds the point to the ‘Point Plot’ traverse and the current drawing.
View the offset graphically.
Closes the Distance-Offset dialog and returns you to the previous view.
If you have saved a computed point, you can Undo the Save.
Creating a Point at a Distance and Offset
Entering Equations