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Group: |
60) Special Areas |
Methodology | |
| Command: | -61 |
| Alpha Alias: | -Define Area |
| Description: | Defines perimeter of trial figure to be set with an area that exceeds a minimum value |
| Data Format: | -61 Area From To {[To].. } ; |
| Problem: | Given the boundary of a tract of land defined by points numbered 1 through 9 and the trial location of a line of division numbered 10 and 11 separating Parcels One and Two. Relocate the line of division radial to point 2 to produce an area exceeding three acres for Parcel One. |
| Solution: | -61 -3 1 2.1 10 11 5 -9 1 ; |
Data Description
| Command | -61 | Defines a trial figure by point numbers which follow the boundary. Must be executed before the 62 and 63 commands are used to compute the exact area of a figure. Disregards the exact area computation if the area of the trial figure is greater than the area entered and the trial line becomes the final line of division in the parcel separation.
The -61 command does not produce any output. It stores the area and boundary of a figure for use in the 62 and 63 commands. This command is most useful for computing subdivisions while adhering closely to zoning regulations. For example, a given lot may be set holding the minimum width required, but you suspect that the area may be less than the minimum requirement. Using this command would increase the width of the lot if the area were too small, but would not decrease the width otherwise. Note: Use this command with caution. In the example above, increasing the width of the lot in question will produce a decreased width in an adjacent lot. Careless use of the command may result in a lot which does not have the proper width at the building restriction line. |
| Area | -3 | Exact area in square feet of the trial figure which will be computed by the 62 or 63 commands. Enter this value as a negative number if you want the area to be printed in acres. Identical results would be produced if you entered 130680 or -3 as your area value. |
| From | 1 | Initial point number of the series of points to be entered defining the trial figure. |
| To
{[To].. } | 2.1
10 11 5 -9 1 | Series of point numbers defining the figure. These points must be entered in a clockwise sequence. The final point number entered must be the same as the first point number entered as your From value.
A curve is defined by entering the point number of the radius point between the two points on curve. Append .1 to the radius point number to indicate it as a radius point. If the central angle is greater than 180°, precede this value with a minus sign. If you want to define a series of sequential points, enter the first and last point numbers in the series. The last point number must be preceded by a hyphen. Example: Enter 1,-50 to define the range of points from 1 through 50, inclusive. |
| End Command | ; | All commands end with a semi-colon. |
Example Command File
$ Example data file for -61 (-Define Area) command
$ set known coordinates of outside boundary
0 1 4885.752 4606.923
5 4513.931 4888.633
6 4547.858 4694.840
7 4611.204 4479.838
8 4737.959 4471.475
9 4907.536 4509.325 ;
$ set curve radius point
1 2 1 1 9 9e9 425 ES;
$ set point 4 on known bearing at 375' from point 5
1 4 5 -1 50 15 22 375;
$ set point 3 on line from radius point 2 to point 4
1 3 2 2 4 425;
$ set trial point 10 on curve with left delta angle
2 10 2 2 1 -29 -50 -8 425;
$ define point 2 as a radius point
14 2 1e9 1 2 0;
$ set trial point 11 on line from 5 to 4 at 100'
1 11 5 5 4 100;
100 Total boundary;
-7 1 1 2.1 10 2.1 3 4 11 5 -9 1;
100 Trial division line;
7 1 10 11;
$ define trial boundary for 3 acres (minimum)
$ calculation with the -61 command
$ -61 -3 1 2.1 10 11 5 -9 1 ; $ using acres
-61 130680 1 2.1 10 11 5 -9 1 ; $ using sf
$ trial line defined for radial shift
62 10 11 2 ;
$ define feature codes for plotting
15.1 LOT1 LOT1 1 1 1;
15.1 LOT2 LOT2 3 1 1;
$ Turn plot on
91 ;
$ define a repeating feature description
15.2 "Closure Lot" ;
$ activate the LOT1 feature code
15 LOT1 ;
7,1 1 2.1 10 11 5 -9 1;
$ activate the LOT2 feature code
15 LOT2 ;
-7,2 10 2.1 3 4 11 10;
$ reset the repeating feature description
15.2 "";