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iPOGO V5 Help Manual On-Line |
Group: |
2) Angle Comps |
Methodology | |
| Command: | -2 |
| Alpha Alias: | -Locate Angle |
| Description: | Computes points from the same point by angle and distance |
| Data Format: | -2 Set From Backsight-Bearing Angle Distance {[Angle Distance]...} ; |
| Problem: | Given point number 20 is located on a line bearing South 89°30'30" West to the backsight point. Set sideshot points number 21 and 22 at angle right of 150°10'14", 75.25 feet and angle left of 170°01'00", 67.51 feet respectively. |
| Solution: | -2 21 20 -3 89 30 30
150 10 14 75.25
-170 01 00 67.51 ; |
Data Description
| Command | -2 | Computes sideshot point coordinates by angle and horizontal distance or vertical angle and slope distance. Allows you to compute points by vertical angles and slope distances using the 8E8 and 9E9 subcommands. (See Command 2, Methodologies 1, 2 and 3) |
| Set | 21 | First point number of the coordinates you want to compute. |
| From | 20 | Previously stored point number from which the coordinates are to be set. |
| Backsight
Bearing | -3 89 30 30 | Direction of the line to the backsight point, i.e., away from the From point number. Bearings may be entered using quadrant definition and angle, or by using point definition.
Note: If you choose to use deflection angles, the direction of the Backsight bearing is modified by 180°, i.e., directing the Backsight bearing ahead. |
| Angle | 150 10 14 | Entered as degrees, minutes and seconds. The angle will be turned to the right when you enter the first data item as a positive number. You can turn the angle to the left by entering the first angle data item as a negative number.
Warning!!! Previous versions of iPOGO required each item to be negative in order to turn an angle to the left. If the degrees were negative and the minutes and seconds were positive, the degrees were turned to the left and the minutes and seconds were turned back to the right. This version of iPOGO turns the degrees, minutes and seconds to the left if the degrees are negative and not equal 0. Recommend setting each of the degrees, minutes and seconds data items to negative for left angles. |
| Distance | 75.25 | Horizontal length of the line in feet from the known point to the point which is to be coordinated.
You can also define the distance using a single slope distance and vertical angle or using a series of slope distances and vertical angles. (See Command 2, Methodologies 2 and 3) To define the total distance with a single slope distance, enter 8E8 followed by the vertical angle, the slope distance, and end of command. (See Command 2, Methodology 2) To define the total distance with more than one vertical angle and slope distance, enter 9E9 followed by a series of vertical angles and slope distances, and 9E9 ; to denote the end of the total distance definition, and end of command. (See Command 2, Methodology 3) |
| {[Angle Distance]...} | -170 01 00
67.51 | Repeating feature of this command. All subsequent points will be set from the From point using the angle and distance specified.
The subsequent point numbers are automatically assigned and ordered as designated by the Set point. If the Set point is entered as a positive number, the subsequent points will be numbered in increasing order. If you enter a negative number, the points that follow will be numbered in decreasing order. Warning!!! Previous versions of iPOGO required each item to be negative in order to turn an angle to the left. If the degrees were negative and the minutes and seconds were positive, the degrees were turned to the left and the minutes and seconds were turned back to the right. This version of iPOGO turns the degrees, minutes and seconds to the left if the degrees are negative and not equal 0. Recommend setting each of the degrees, minutes and seconds data items to negative for left angles. |
| End Command | ; | All commands end with semi-colon. |
Example Command File
$ Example data set for -2 (-LOCATE ANGLE) command.
$ Set initial point 20 at known coordinates
0
20 1000 1000 ;
$ Use the -2 command to compute coordinates
$ for points 21 and 22
-2 21 20 -3 89 30 30
150 10 14 75.25
-170 01 00 67.51 ;
$ Set additional point for drawing line.
1 1 20
-3 89 30 30 100 ;
$ Setup plotting parameters with
$ feature, layer, color, style, thickness
15.1 L1 Line1 7 1 1;
$ Turn plot on
91;
$ Activate the feature
15 L1 ;
$ Draw the lines.
7 1 1 20 21 ;
7 2 20 22 ;