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Group: |
16) Road Alignments |
Methodology | |
| Command: | 16 |
| Alpha Alias: | Os AlignSta |
| Description: | Sets points at left and/or right offsets |
| Data Format: | 16 Set Start-Sta-Value Increment Left-Offset Right-Offset Define-Alignment ; |
| Problem: | Given points 5 through 9 that define an alignment where point 5 equals station 0+00. Set points along the alignment on 20 foot station intervals at 25 feet left, on centerline, and 35 feet right of the alignment. Set the new point numbers beginning with number 200. |
| Solution: | 16 200 0 20 25 35 5 6 7.1 8 9 ; |
Data Description
| Command | 16 | Sets points on the defined alignment, to the left of the defined alignment at a specified distance and/or, to the right of the defined alignment at a specified distance.
The point numbers are set in sequence, with the point on the alignment being set first, the right offset next, and the left offset last. For each station the points will be set on the alignment, but the left and right offsets are optional. The station values for setting the points are calculated using the Start-Sta-Value as the starting point and the Increment value as the distance between stations. Stations are calculated for the entire length of the defined alignment, up to but not including the last point. |
| Set | 200 | Point number which is assigned as the starting point. |
| Start-Sta-Value | 0 | Station value assigned to the start of the defined alignment. Subsequent stations are calculated by adding the Station value to the increment value. |
| Increment | 20 | Distance between stations. Points will be set at this interval until the calculated station is greater than the end of the defined alignment. |
| 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-
Allignment | 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 (OS AlignSta) 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 and station points
$ using the 16 command
16 200 0 20 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 (without arcs) ;
7,1 202 205 208 211 214 217 220 223
226 229 232 235 238 241 244 247;
15 RT_OS ;
100 35' right offset line (without arcs) ;
7,1 246 243 240 237 234 231 228 225
222 219 216 213 210 207 204 201 ;