iPOGO V5 Users Group - Help Manual

*Methodology*
Command:	11
Alpha Alias:	Os CurveRoW
Description:	Computes points along street centerline and right-of-way
Data Format:	11 RW-Width Set Backsight PI PI-Ahead Arc-Defined {[Set PI-Ahead Arc-Defined]... } ;
Problem:	Given points of intersection 1 through 5, compute points as shown.
Solution:	11 60 10 1 2 3 290 0 20 4 0 210 30 5 0 0 ;

Data Description

Command	11	Computes points at the radius points, Points of Curvature (PC), and Points of Tangency (PT) of the street centerline and right-of-way lines. Computes additional curves for the defined centerline and right-of-way. Before executing the 11 command, you must compute three points which determine the central angle and direction of the curve to be computed: the Backsight, Point of Intersection (PI) of the tangents, and the PI-Ahead. Both the Backsight and the PI-Ahead must lie on the centerline tangent. The initial curve to be computed is directed from the Backsight toward the PI. If you use the repeating feature of the 11 command, the PI-Ahead will be the PI of the tangents of the next curve to be set. For each defined curve, points are computed in the following order: radius point (RP), centerline PC, centerline PT, PC and PT along the inside right-of-way line toward the RP, and PC and PT along the outside right-of-way line away from the RP.
RW-Width	60	Width of the street right-of-way. Enter 0 (zero) if you want only the centerline to be computed. To compute an easement having right-of-way lines at unequal distances from the alignment, enter the offset distances from the alignment instead of the RW-Width. Enter the offset from the alignment to the left right-of-way line as a negative value, followed by the offset to the right right-of-way line.
Set	10	Point number to be assigned to the initial radius point to be computed. The point numbers for the Points of Curvature and Points of Tangency are automatically assigned from this point number.
Backsight	1	Previously computed point number that defines the centerline backsight. This point must lie on the centerline tangent.
PI	2	Previously computed Point of Intersection of the tangents for the desired centerline curve.
PI-Ahead	3	Previously computed point number that defines the PI ahead of the curve to be computed. This point must lie on the centerline tangent.
Arc-Defined	290, 0	Requires two values: a curve length value and a 0 (zero) or 1 (one). You determine the method for computing the centerline curve by the order in which you enter the values and by the use of a plus or minus sign before the curve length value. Refer to the table below to see how you should enter your two Arc-Defined values. Replace the n with the correct length and the sign indicated. To compute the curve by the length of: Compound or reverse arc use 0, 0 Tangent use 0, +n External use 0, -n Degree of curve use -n, 0 Radius use +n, 0 Chord use +n, 1 Arc use 1, +n Note: Degree of curve is entered as a decimal of degrees. For example, a degree of curve of 1°30', is entered as 1.5.
{[Set PI-Ahead Arc-Defined]... }	20 4 0, 210	Repeating feature of this command which allows you to define additional curves on the same centerline. The original backsight is replaced by your PI, and the original PI-Ahead becomes the PI for the new curve. Enter the point number to be assigned to the radius point, the known point number of the PI ahead of the curve to be computed and the two values which determine the method of curve computation.
{[Set PI-Ahead Arc-Defined]... }	30 5 0, 0	Repeating feature of this command which allows you to define additional curves on the same centerline. The original backsight is replaced by your PI, and the original PI-Ahead becomes the PI for the new curve. Enter the point number to be assigned to the radius point, the known point number of the PI ahead of the curve to be computed and the two values which determine the method of curve computation.
End Command	;	All commands end with a semi-colon.

Example Command File

$ Example data set for the 11 (Os CurveRoW) command.

$ Set the initial points.
  0 1 1000 1000 ;
  1 2 1 -1 45 0 0 300 
        -2 60 0 0 600 
        -1 60 0 0 300 
        -2 65 0 0 300 ;

$ Set the points to define the road.
  11 60 10 1 2 3 290 0 20 4 0 210 30 5 0 0 ;

$ Setup feature codes with 
$  cmd  feature, layer, color, style, thickness
  15.1    RW     RW   1      1       1 ;
  15.1    CL     CL   3      1       1 ;

$ Turn plot on
  91 ;

$ Activate the RW feature
  15 RW ;
     100 Inverse right of way lines;
         7 1 15 10.1 16 23 20.1 35 30.1 36 ;
         7 1 13 10.1 14 25 20.1 33 30.1 34 ;

$ Activate the CL feature
  15 CL ;
     100 Inverse road centerline;
         7 1 1 11 10.1 12 21 20.1 31 30.1 32 5 ;

Help for this command was last updated: 04/03/2000 3:00:00 PM

iPOGO V5 Help Manual On-Line

Group:Command:

11) RW Alignments11 or Os CurveRoW

Group:
Command:

11) RW Alignments
11 or Os CurveRoW