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iPOGO V5 Help Manual On-Line |
Group: |
10) Rotation/Scale |
Methodology | |
| Command: | 10 |
| Alpha Alias: | Define RotScale |
| Description: | Presets a specified rotation and distance factor |
| Data Format: | 10 Angle Distance ; |
| Problem: | Given point 50 found on a property line having a deed bearing of North 65°00'00" East. Set point 52 at 10 perches and point 56 on a deed bearing of South 75° 00'00" East, 10 perches. Rotate the bearings by applying an angle of 05°14'10" clockwise. Convert the perch distances to linear feet. (1 perch = 16.5 feet). |
| Solution: | 10 5 14 10 16.5 ; |
Data Description
| Command | 10 | Predefines a specified angle of rotation and a specified distance factor. Used before computing commands that reset points. Affects ALL following computing commands that require bearings, angles and distances.
The specified angle will be added to or subtracted from any input angle or bearing following the 10 command. Bearings defined by two point numbers, however, are not affected. The distance factor is a multiplier. Any input distance value following the 10 command will be multiplied by this factor. The effect of the 10 command is ended by entering a new 10 command with a new angle of rotation and distance factor or by entering a zero rotation and unity factor, i.e., 10, 0, 0, 0, 1 ; . |
| Angle | 5 14 10 | Degrees, minutes, and seconds. Enter all items as positive values to define a clockwise rotation. When each data item is entered as a negative number, a counter-clockwise rotation is defined.
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 | 16.5 | Entered as a number greater than zero. When you enter the number 1, no correction of distance will result.
Miscellaneous distance conversion factors: Note: In 1959, the US and UK technical and scientific agencies adopted 2.54 cm (exact) as the standard for 1 inch. However, the previous US meter was 39.37 inches (exact). This leads to a significant difference when applied to meter and feet conversions in the typical State Plane Coordinate value ranges. It is crucial that the user be aware of the proper conversion factor to be used for the computing project. (Reference: Surveying by Bouchard and Moffitt) |
| End Command | ; | All commands end with a semi-colon. |
Example Command File
$ Example data set for the 10
$ (Define RotScale) command
$ set initial point
0 50 100 100 ;
$ set a rotation and scale factor that applies
$ to the following computations
10 5 14 10 16.5 ;
$ compute 2 deed points on the rotated lines
$ using bearing and perches
1 52 50 NE 65 0 0 10 ;
1 56 52 SE 75 0 0 10 ;
$ reset rotation and scale factor
10 0 0 0 1 ;
$ Setup feature codes with
$ cmd feature, layer, color, style, thickness
15.1 L1 LINES1 7 1 1 ;
$ Turn plot on
91 ;
$ Activate the L1 feature
15 L1 ;
100 Inverse rotated deed lines;
7,1 50 52 56 ;