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Group: |
16) Road Alignments |
Methodology | |
| Command: | 16.1 |
| Alpha Alias: | Os Align |
| Description: | Sets minimum points to define left and/or right offsets |
| Data Format: | 16.1 Set Left-Offset Right-Offset Define-Alignment ; |
| Problem: | Given points 5 through 9 that define an alignment. Set points along the alignment at 25 feet left, on centerline, and 35 feet right of the alignment. Set the new point numbers beginning with number 200. |
| Solution: | 16.1 200 25 35 5 6 7.1 8 9 ; |
Data Description
| Command | 16.1 | Sets points to the left of the defined alignment at a specified distance and to the right of the defined alignment at a specified distance.
The point numbers are set in sequence, with the right offset being set first, then the left offset. Only the minimum points required to define offset lines on one or both sides of the defined alignment are set. |
| Set | 200 | Point number which is assigned to the starting point. |
| Left-Offset | 25 | Distance at which the points will be set to the left of the alignment. If no points are to be set to the left, then this value is 0. |
| Right-Offset | 35 | Distance at which the points will be set to the right of the alignment. If no points are to be set to the right, then this value is 0. |
| Define-
Alignment | 5, 6, 7.1, 8, 9 | Series of existing points required to define a segment of the alignment. As many of these points may be entered as desired, but they must be entered in alignment order.
Note: To define arc segments, append .1 to the radius point number. Enter that radius point number between the two tangent points as in PC, RP.1, PT. |
| End Command | ; | All commands end with a semi-colon. |
Example Command File
$ Example File for the 16.1 (OS Align) Command
$ Set the alignment points 5 through 9
0 5 100 100 ;
1 6 5 -1 45 0 0 100 -2 45 0 0 75 ;
2 8 7 7 6 90 0 0 75 ;
1 9 8 6 7 85 ;
$ compute the offset points using the 16.1 command
16.1 200 25 35 5 6 7.1 8 9 ;
$ Setup feature codes with the 15.1 command
$ cmd feature, layer, color, style, thickness
15.1 CL CL 3 1 1 ;
15.1 LT_OS LEFT_OS 1 1 1 ;
15.1 RT_OS RIGHT_OS 4 1 1 ;
$ Turn plot on
91 ;
$ Activate the CL feature code with the 15 command
15 CL ;
100 Alignment centerline ;
7,1 5 6 7.1 8 9 ;
15 LT_OS;
100 25' left offset line ;
7,1 201 203 7.1 205 207 ;
15 RT_OS ;
100 35' right offset line ;
7,1 200 202 7.1 204 206 ;