Points by Polyline

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Introduction

Creates Points at polyline vertices.  Polylines can be selected individually or by layer.

Created points will have a description consisting of a Code (eg: LOT), including a Survey String number.  Survey String numbers are auto incremented per polyline.  If the Create Survey Strings command is run, the polyline will be recreated as a Survey String (enabling direct surface addition as a breakline and 3D polyline creation).

Horizontal Positioning

COGO Points are created at every vertex of the polyline/s selected.

COGO Points located at polyline vertices are dynamcally referenced to the polyline - editing the polyline and updating the points will result in the COGO point location changing to match the vertex.

Polyline Geometry, Point linework Paramters and Survey String Creation

For curved sections of the polyline, the software will insert a Curve Parameter code at the start of each curve, add a (statically positioned) mid-point COGO Point, and a Line Parameter code at the end of each curve.

If polylines are closed, the 'Close' point parameter will be added to one of the points, per polyline. 

If the Create Survey Strings command is run, the Survey String will accurately describe the polyline coordinate geometry.  Survey Strings can be created as 3D polylines and can act as direct breaklines to a surface via the Point Group.

Frontage and Rear Line Points

In the context of designing land parcels. Frontage points are those closest to a Road String and describe the points along the 'front' of a parcel.  Rear points are those furthest from teh Road String and describe the points along the 'back' of a parcel.

This command allows users to associate the (dynamically reference) Frontage points to a Road String (or COGO Point, or 3D polyline) and the Rear points to be associated with (dynamically reference) the Frontage points.  This would provide a convenient method for controlling grades from the back to the front of the parcel.

Elevation Positioning

For elevations, users can:

• Set a default elevation, either with a single elevation value or to obtain from the surface

• Assign elevations for points close to a Road String (known as Frontage Points) as a dynamic reference to the Road String/Code.  When enabled, the software will automatically scan the drawing for Road Strings within the offset specified, and also look for the nearest code on that road string (either left or right side, whichever is closest)
  Note: Only Road type strings will be scanned for use as an elevation reference to points when Auto Frontage is applied.

• Assign elevations for points located more than a minimum distance away from the Frontage Points (known as Rear points) and with dynamic reference to the closest Frontage Point (measured olong the polyline).

In the image above, the selected points are displaying their dynamic references (with purple lines and text).  Points close to the Road have a dynamic 5% grade from the Road boundary code for elevation.  Points far from the Road have a dynamic 1% grade to the Frontage Points.

Elevations from a Road String or Road String Code

When reference is made to a Road String or Road String Code, the software will locate the perpendicular distance along the Road String and then will report back the closest Sampled Section elevation along that Road.  It is important to consider this - it may be required to add a Sampled Section on the Road at this location for the most accurate calculation.

In the Dynamic Positioning form, the software will report the calculated perpendicular chainage on the Road String, and the graphis when a point is selected will show a perpendicular line and any grade relationship established.

Details

Upon selecting the command the following form is displayed:

Polyline Selection	Select polylines to use for creating Points
By Layer	Picklist of drawing layers to scan for polylines. Select the pick icon to pick an object in the drawing to set the layer.
By Selection	If selected, click on Select Polylines and pick individual polylines in the drawing
	The number of polylines will be displayed
Cogo Point Creation Tab	Set the controls for COGO points created
	Code Type in the Point Code Start String Number Type in a start Survey String (String) number. Default Point Style Select a Point Style to apply to the created points. Use the Edit button to open the Point Style form. Code Set Table Select a Code Set Table to apply a Point Style based on the assigned Point Code.
Cogo Point Creation Tab	Set the controls for COGO point elevations
	Single Elevation Toggle on and type in a single elevation for all created points From Surface Toggle on and select a surface to adopt elevations from. Note: if elevations cannot be obtained at a vertex, that point is not created. Auto Frontage (Override Elevations) Toggle on to assign elevations by dynamic reference to any String located within the Road (String) Search Offset.     Road Search Offset The closest Road String located within this offset will have a dynamic reference elevation applied Points located outside this offset will use the other elevation methods.    Setup Dynamic Elevations Click here to establish how elevations are to be calculated.  Input options are as per the Positioning form, with the horizontal reference options disabled.     Points located outside the Road Search Offset can assign elevations by dynamic reference to the nearest point (measured along the polyline) that has an 'Auto Frontage' dynamic reference applied.  These are known as 'Rear' points.    Reference Frontage point elevations to rear points Toggle on to assign elevations by dynamic reference to the nearest point (measured along the polyline) with an 'Auto Frontage' dyanamic elevation reference applied. If untikced, Points created at the polyline vertices that are not assigned 'Auto Frontage' elevations will use the other elevation methods.    Reference Frontage point elevations to rear points Toggle on to assign elevations by dynamic reference to the nearest point (measured along the polyline) with an 'Auto Frontage' dyanamic elevation reference applied. If untikced, Points created at the polyline vertices that are not assigned 'Auto Frontage' elevations will use the other elevation methods.    Minimum Distance To avoid dynamically associating Points that are close to 'Auto Frontage' points, users can set a minimum distance (offset) where points will not create a dynamic elevaton reference to the 'Auto Frontage' points.    Additional Elevation Type in an additional elevation to apply to the elevation of the nearest 'Auto Frontage' point.    Grade (%) Type in an grade to apply from the elevation of the nearest 'Auto Frontage' point.
Create Cogo Points	Click to create COGO points in the drawing