Horizontal Regression Analysis Vista

The Horizontal Regression Analysis Vista allows review and refinement of the data for a generated alignment.

Working in the Horizontal Regression Analysis Vista

The Horizontal Regression Analysis Vista offers a means to review and enhance the results of the generated alignment. The vista displays from the Horizontal Regression Setup dialog box. The following tools are available to better navigate and visualize the data.

Graphs

Place the cursor in the graph area to:

• Zoom. Scroll the mouse wheel up to zoom in and down to zoom out.
• Pan. Left-click hold and move the cursor left and right to pan zoomed graphs.
• Segment Data. Hold the cursor over a segment (top graph) to view a tooltip with its station and measurement information.
• Segment Select. Select a segment to see it's highlighted row in the Horizontal Regression Segments Table to the right.

Tables

• Left-click and drag column headers to reorganize their display order.
• Place the cursor over a column header and click to access other display options.
  • Sort by ascending and descending order.
  • Pin the column to the left or right of the table.
  • Filter by column data.
  • Quickly hide a column.
  • Manage column visibility.

De-noise Data

This slider controls the smoothing filter thresholds for generating the alignment. Move the slider to the left for less smoothing and to the right for more smoothing.

Spiral Sensitivity

This slider controls the sensitivity when fitting a spiral model to known data. Move the slider to the left for more sensitivity and to the right for less sensitivity.

Max Radius

Specifies the largest acceptable radius of curves that are created from the input data.

Max Radius default values:

• 5000 meters for metric
• 15000 feet for imperial

Horizontal Regression Segments Graph

The graph at the top of the vista displays the regression segments of the horizontal regression alignment. This graph plots the data for curvature and radius to stations. The Horizontal Regression Segments Table to the right contains the segment data.

The visible segments of the horizontal regression are color coded representations:

• Red. Tangent
• Blue. Arc
• Green. Spiral

Placing the cursor over a segment will display its current data information as a tooltip at the top of the graph. Selecting a segment will highlight its representative row in the Horizontal Regression Table to the right.

Horizontal Regression Segments Table

Segment

Displays the horizontal regression segment type: either tangent, arc, or spiral.

Start

Displays the start station of the horizontal regression segment.

End

Displays the end station of the horizontal regression segment.

Length

Displays the length of the horizontal regression segment.

Radius

Displays the radius of the horizontal regression segment.

Note: Tangents are specified as Infinity. Individual Arcs radius values can be manually adjusted.

Avg. Offset

Displays the average offset of the horizontal regression segment from its source entity.

Max Offset

Displays the maximum offset of the horizontal regression segment from its source entity.

Horizontal Regression Points Table

Data Point

Sequential number generated in the order in which the regression points were generated.

Station on Entity

Displays the station of the data point from the horizontal regression entity.

Northing

Displays the Northing value of the point that is closest to the regression point on the entity.

Easting

Displays the Easting value of the point that is closest to the regression point on the entity.

N on Entity

Displays the Northing ordinate from the horizontal regression entity.

E on Entity

Displays the Easting ordinate from the horizontal regression entity.

Offset

Displays the distance between the survey data point and the horizontal regression entity.

Offset Side

Displays which side of the regression point is offset from the horizontal regression entity.

Horizontal Navigator

It is placed at the bottom of the page. It helps you move from left to right on the alignment.