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Group: |
18) Translation |
Methodology | |
| Command: | 18.2 |
| Alpha Alias: | Transform RenumPlus |
| Description: | Transforms deed points to field points using rotation and distance factors while renumbering new points by adding a constant |
| Data Format: | 18.2 Add-Constant Field-Point Deed-Points ; |
| Problem: | Given field points 17, 18, 19, 20, 21 and 22 and deed points 101, 102, 103, 104, 105 and 106; and the determination that deed points 101 and 105 correspond to field points 17 and 21. Rotate the deed, using the angle of rotation between 101-105 and 17-21; apply the distance factor to the deed distances; equate the coordinates of point 101 to point 17 and re-coordinate and assign new point numbers by adding a factor of 400 to points 101 through 106 using bearings and distances from point 101. (See example data file for complete solution.) |
| Solution: | $ define rotation and scale -10 101 105 17 21 ; $ perform transformation 18.1 400 17 101 102 103 104 105 106 ; |
Data Description
| Command | 18.2 | Transforms deed points to field points using the angle of rotation and the distance factor as computed in the 10 or -10 command. Assigns new point numbers to the adjusted deed coordinates by adding a factor to the existing point numbers.
The combined use of commands 10 or -10 and 18.2 results in the translation or rotation of the axis of the deed or plat figure. Note: The field and deed points are entered in the reverse order of the 10 and -10 commands. You must enter the field point first in the 18.2 command. |
| Add-Constant | 400 | Constant value added to each previously computed and stored deed point number when automatically re-numbering the adjusted deed coordinates. |
| Field-Point | 17 | Point number of the field point that is to be used as the starting coordinate, or point of rotation. |
| Deed-Points | 101
102 103 104 105 106 | Previously computed deed point numbers to be equated with the field points.
Enter the first point to be equated with the specified field point. Then enter, in order, the deed points which define the deed lines. Each defined deed line is altered by the angle of rotation and the distance factor from the previously executed 10 or -10 command, and the coordinates for each deed point are recomputed and renumbered by adding a factor to the existing number. |
| End Command | ; | All commands end with a semi-colon. |
Example Command File
$ Example data set for the 18.2
$ (Transform RenumPlus) command.
$ Set the initial points.
0 17 1620.0 508.3
18 2310.0 1225.0
19 1620.0 1825.0
20 1770.0 2691.7
21 1000.0 1783.3
22 1060.0 983.3
101 1733.5 3217.0
102 2333.5 3967.0
103 1583.5 4579.5
104 1808.5 5579.5
105 908.5 4592.0
106 1028.5 3592.0 ;
$ Calculate the rotation and distance factors
$ using -10 command.
-10 101 105 17 21 ;
$ Transform the deed points using the 18.2 command.
18.2 400 17 101 102 103 104 105 106 ;
$ reset angle rotation and distance factors to default
10 0 0 0 1 ;
$ define the feature code parameters
$ cmd fea layer color style thickness
15.1 fpts fieldpts 1 1 1;
15.1 dpts deedpts 3 1 1;
15.1 npts newpts 4 1 1;
15.1 chk check 2 1 1;
$ turn plotting on
91 ;
$ activate the fieldpts feature and inverse the boundary
15 fpts;
100 Field points closure ;
7 1 17 18 19 20 21 22 17 ;
$ activate the deedpts feature and inverse the boundary
15 dpts;
100 Original deed closure ;
7 2 101 102 103 104 105 106 101 ;
$ activate the newpts feature and inverse the boundary
15 npts;
100 Transformed deed closure with new numbers ;
7 3 501 502 503 504 505 506 501 ;
$ activate the check feature and inverse the boundary
15 chk;
100 Comparison of field, deed and transformed lines;
6 1 17 21 101 105 501 505 ;