Line Offset

The line is defined by its azimuth, azimuth to another point, or the end point of the line. The plot will display the defined line.

To calculate point locations relative to a line:

  1. Enter the Start Point of the line. This can be entered manually, or selected from the map or from the list of the job points or measured. Clicking the button for GNSS survey opens the Topo dialog, clicking the button for optical survey opens the Sideshot dialog. In the dialogs you can save the measured point in the current job and use the point for the offset task.
  2. Select between End Point and Azimuth to define the direction of the line.
  3. In Ht Comp, select the type of height computations for the computed points:
  4. When the Interpolate Ht: is selected, the Start 2D / Start 3D button is available. In the field Start 2D / Start 3D you can set station for the Start point in the horizontal plan or 3D. Also the line length is displayed for the selected mode.
  5. Select the Num Subs check box to enter the number of subdivisions if required to subdivide the line. For instance a value of 3 indicates that you want to compute four points by subdividing the line in three equal segments.
  6. Select the Include Transition Point check box to include start and end points if they do not fall on a designated station.
  7. Click Next to define stationing for offsets and calculate points. More...

Station & Offsets

In the dialog you can define stationing which is used to compute the points locations in relation to lines, curves and alignments. The content of the dialog depends on the selection of Num Subs check box in the previous dialog:

If the Num Subs check box is selected and subdivision is not equal to zero:

  1. Select Start Station to set the current or start station. The two arrow buttons allow you to decrease or increase the station by the interval specified in the station Interval shown.
  2. If you wish to compute several points, set the desired End Station. The two arrow buttons allow you to decrease or increase the station by the interval specified in the station Interval shown in the next line.
  3. The Interval value will be automatically calculated as "line length" divided by "Num Subs" .
  4. Enter the Right Offset or Left Offset of the computed point with respect to the line at the stations.
  5. Enter the Up Offset or Down Offset height offset, or the vertical Grade Offset (in percentage) with respect to the height of the line at the station. If the grade is falling, the value should be negative.
  6. Enter the name of the current or starting computed Calc Pt. Select the code for this point from the existing codes and, if required, click to set the point's attributes. More...
  7. Click Calc to calculate the offset points. For this case, the software creates point(s) within interval specified by Start Station and End Station values.

If the Num Subs check box is not selected, you can select between Station, Skew Station and Start Station to set the current or starting station:


Corners Offset

New points are defined by the offset from the nodes of the existing linework. Offset may be defined in three ways - either inline, or perpendicular right or perpendicular left. Note, that the new point will be created for each linework segment, connected to the node.

To calculate point locations in relation to a linework nodes:

  1. Choose between two options to define the linework:
  2. Click Next.
  3. Select between Perpendicular/Bisector/Inline and enter the offset from the linework node.
  4. If selected Perpendicular or Bisector, select either Left or Right.
  5. In Calc Pt, enter the name of the first point to be created.
  6. In Code, select the code for the points to be created.
  7. Click Create.
  8. The software creates points with the defined offset.

Curve Offset

To calculate point locations in relation to a curve:

  1. In PC Point, enter the point of curve, the starting point of the arc.
  2. In PT Point, enter the point of tangency, the ending point of the arc.
  3. Select between Radius/ Curve Angle/ Chord Angle and enter the radius parameters of the curve as required.
  4. In Ht Comp, select the type of height computations for the computed points:
  5. When the Interpolate Ht: is selected, the Start 2D / Start 3D button is available. In the field Start 2D / Start 3D you can set station for the Start point in the horizontal plan or 3D. Also the line length is displayed for the selected mode.
  6. In Turn, select on which side the center point of the curve is located. The plot will display the defined curve, and Length will show the calculated length of the curve.
  7. Select the Include Transition Point check box to include transition points if they do not fall on a designated station.
  8. Length, enter the starting station (chainage) of the line.
  9. Select the Num Subs check box to enter the number of subdivisions if required to subdivide the line. For instance a value of 3 indicates that you want to compute four points by subdividing the line in three equal segments.
  10. Click Next to define stationing for offsets and calculate points. More...

Linework Offset

Linework is provided in the points which are connected to form opened or closed polylines.

To calculate point locations in relation to a linework:

  1. Choose between two options to define the linework:
  2. Select a task you want to calculate:
  3. Click Create Points if required to generate points along a linework and save them in a point list. More...

Offset Linework

To create a new Offset Linework at entered offsets from the selected linework:

  1. In the Offset Line field enter the name for the offset linework. The field initially displays a default name <the linework name_[n]> where [n] is an integer for the first available unique name that does not already exist in the job. You can change this name.
  2. Enter the Right or Left offset perpendicular to the existing line in the horizontal plane.
  3. Enter the Up or Down height offset, or the vertical Grade (in percentage) with respect to the height of the line at the station. If the grade is falling, the value should be negative.
  4. Enter the Forward or Backward offset of the computed line along the existing linework.
  5. If you need to rotate the computed line from the existing line, enter the angle value to Rotate Start or Rotate End field. The positive value is rotation in the clockwise direction. The Rotate Start selection rotates the Start Point-End Point line, the Rotate End selection rotates the End Point-Start Point line.
  6. Observe the preliminary view in the horizontal and vertical planes. The plot windows show both the selected line as well as the offset line at the current entered offset values. These plot windows update dynamically every time you change the offset values.
  7. Click Create to compute and save the offset linework to the current job.

Offset Points From Linework

To create points at the entered offsets from the selected linework:

  1. In the field Start 2D / Start 3D you can set station for the Start point in the horizontal plan or 3D.
  2. Select the Include Transition Point check box to create transition points every time the stationing passes a transition point. The check box is hidden if the Transition Only is selected.
  3. In Interval, select how the offset points will be created.
  4. Click Next to define stationing for offsets and calculate points. More...

Station & Offsets

In the dialog you can define stationing which is used to compute the points locations in relation to linework, if the Offset Points From Linework is selected. The content of the dialog depends on the selection of Subdivide in the Linework Offset dialog:

If the Subdivide is selected and subdivision is not equal to zero:

  1. Select Start Station to set the current or start station. The two arrow buttons allow you to decrease or increase the station by the interval specified in the station Interval shown.
  2. If you wish to compute several points, set the desired End Station. The two arrow buttons allow you to decrease or increase the station by the interval specified in the station Interval shown in the next line.
  3. The Interval value will be automatically calculated as "line length" divided by "Num Subs".
  4. Enter the Right Offset or Left Offset of the computed point with respect to the line at the stations.
  5. Enter the Up Offset or Down Offset height offset, or the vertical Grade Offset (in percentage) with respect to the height of the line at the station. If the grade is falling, the value should be negative.
  6. In Angle Pts, select how the angle points will be computed at segment intersections:
  7. In Curve, select how points on curve segments will be selected:
  8. Enter the name of the current or starting computed Calc Pt. Select the code for this point from the existing codes and, if required, click to set the point's attributes. More...
  9. Click Calc to calculate the offset points. For this case, the software creates point(s) within interval specified by Start Station and End Station values.

If the Interval is selected, you can select between Station, Skew Station and Start Station to set the current or starting station:

If the Trans Only is selected:

  1. Select Start Station to set the current or start station. The two arrow buttons allow you to decrease or increase the station by the interval specified in the station Interval shown.
  2. If you wish to compute several points, set the desired End Station. The two arrow buttons allow you to decrease or increase the station by the interval specified in the station Interval shown in the next line.
  3. The Interval value will be automatically calculated as "line length" divided by "Num Subs" .
  4. Enter the Right Offset or Left Offset of the computed point with respect to the line at the stations.
  5. Enter the Up Offset or Down Offset height offset, or the vertical Grade Offset (in percentage) with respect to the height of the line at the station. If the grade is falling, the value should be negative.
  6. In Angle Pts, select how the angle points will be computed at segment intersections:
  7. In Curve, select how points on curve segments will be selected:
  8. Enter the name of the current or starting computed Calc Pt. Select the code for this point from the existing codes and, if required, click to set the point's attributes. More...
  9. Click Calc to calculate the offset points. For this case, the software creates point(s) within interval specified by Start Station and End Station values.

Create Points

To create points along a linework:

  1. Select the Interval or Segments radio button to enter the interval between the calculated points or the number of segments in the linework.
  2. Select the Along Tangent check box to enter the interval between the calculated points or the number of segments in a straight line.
  3. Select the Along Curve check box to enter the interval between the calculated points or the number of segments in a curve.
  4. Select the corresponding check boxes to create additional linework points as required:
  5. Click Next to define the calculated points' details. More...

Points Details

Enter details for the calculated points:

  1. Enter the name of the First Point. Select the code for this point from the existing codes and, if required, click to set the point's attributes. More...
  2. In required, select the Prefix/Suffix from the drop-down list and enter the desired value.
  3. Optionally, select the Save Points To Point List check box to create a Point List with the name specified in the field which appears.
  4. Click to save the calculated points.

Offset Points

To calculate points at an offset from the current job's points:

  1. In the Points/Point List/Linework/Area field, select points to which the offset will be applied or select groups of points by selecting point lists, linework or area:
  2. The list and the plot will display the points currently selected.
  3. If required, move points up and down the list to change the order.
  4. To obtain information about a single point highlighted in the list, use the Info icon .
  5. Click to remove the highlighted point from the list.
  6. Click Next to set offsets. More...

Offset Points

Enter offsets and details for the calculated points:

  1. Select a Method of the three available to enter appropriate offset data as required:
  2. Enter the name of the current or starting computed Calc Pt. Select the code for this point from the existing codes and, if required, click to set the point's attributes. More...
  3. Click Calc to calculate the offset points.

Road Offset

To calculate the offset points along an alignment:

  1. In Road/H Alnt/HV Alnt, enter the name of the road or alignment to be used for computing points. This can be entered manually, or chosen from the list .
  2. The SS field shows the starting station of the selected road of alignment, the distance from the beginning. The plots display the alignment in the horizontal and vertical planes.
  3. If required, click Calculate Points to generate points along the defined Road. More...
  4. Click Station & Offsets >> to define stationing for offsets and calculate points. More...