iPOGO V5 Users Group - Help Manual

*Methodology*
Command:	19.2
Alpha Alias:	Transit Closure
Description:	Adjusts error of closure by Transit Rule
Data Format:	19.2 Point# Point# Point# {[Point#] ..} ;
Problem:	Given a computed deed closure for points 1 through 8 with the error of closure defined by the closing line from 8 to 1. Adjust the deed closure with the Transit Rule to distribute the error in distances so that all bearings are held and force closure on point 1.
Solution:	19.2 1 2 3.1 4 -8 1 ; (see image of 19 command) 19.2 21 -27 21; (see example data file)

Data Description

Command	19.2	Performs a distribution of error in both open and closed geometric figures using the Transit Rule. The coordinates for the final point number entered are held, and the other coordinates are adjusted to make the next-to-last point number coincide with the last point entered. This distributes the error in the distances so that all bearings are held. The error of closure between the next-to-last point and the final point will be printed. If the error is large, the adjustment will be unsatisfactory. In cases of large error, use commands -10 and -18 to make the desired adjustment. See 19 command for Crandall Method adjustment and 19.1 command for Compass Rule adjustment.
Point# Point# Point# {[Point#] ..}	1 2 3.1 4 -8 1	Previously computed point numbers. Requires at least three point numbers and not more than 500 point numbers including curve centers. Append .1 to a point number to indicate it as a radius point. You must specify radius points to prevent adjustments to radius lengths. If the figure to be adjusted is a closed figure, the final point number you enter must be the same as the initial point number. If you want to define a series of sequential points, enter the first and last points in the series. The last point number of the series must be preceded by a hyphen. All the points between the two values are adjusted. Example: Enter 1, -50 to adjust all the points from 1 through 50, inclusive.
End Command	;	All commands end with a semi-colon.

Example Command File

/*
 Example file for 19 (Crandall Closure) command
 Example file for 19.1 (Compass Closure) command
 Example file for 19.2 (Transit Closure) command
 -----------------------------------------------
 Example data based on
   Surveying: Theory and Practice
   by Davis, Foote & Kelly, 
   Fifth Edition, Page 460 - 464 
*/

$ define the feature code parameters
$ cmd   fea   layer        color style thickness
  15.1  dpts  deedpts      1     1      1;
  15.1  cmpts compasspts   2     1      1;
  15.1  trpts transitpts   3     1      1;
  15.1  crpts crandallpts  4     1      1;

$ compute initial starting points
  0  1 0 0 
    11 0 0 
    21 0 0 
    31 0 0;

$ compute initial points for no adjustment
  1 2 1 NE 00 00 00  500.0
        NE 45 00 00  848.6
        SE 69 27 00  854.4
        SE 11 19 00 1019.8
        SW 79 42 00 1118.0
        NW 54 06 00  656.8;

$ compute initial points for Compass Rule
  1 12 11 NE 00 00 00  500.0
          NE 45 00 00  848.6
          SE 69 27 00  854.4
          SE 11 19 00 1019.8
          SW 79 42 00 1118.0
          NW 54 06 00  656.8;

$ adjust the closure with 19.1 (Compass Rule) command
  19.1 11 -17 11;

$ compute initial points for Transit Rule
  1 22 21 NE 00 00 00  500.0
          NE 45 00 00  848.6
          SE 69 27 00  854.4
          SE 11 19 00 1019.8
          SW 79 42 00 1118.0
          NW 54 06 00  656.8;

$ adjust the closure with 19.2 (Transit Rule) command
  19.2 21 -27 21;

$ compute initial points for Crandall Method
  1 32 31 NE 00 00 00  500.0
          NE 45 00 00  848.6
          SE 69 27 00  854.4
          SE 11 19 00 1019.8
          SW 79 42 00 1118.0
          NW 54 06 00  656.8;

$ adjust the closure with 19 (Crandall Closure) command
  19 31 -37 31;

$ turn plotting on
  91 ;

$ activate the deedpts feature and inverse the boundary
  15 dpts;
     100 inverse original deed;
         7 1 1 -7 1;

$ activate the cmpts feature and inverse the boundary
  15 cmpts;
     100 inverse Compass Rule adjusted points;
         7 1 11 -17 11;

$ activate the trpts feature and inverse the boundary
  15 trpts;
     100 inverse Transit Rule adjusted points;
         7 1 21 -27 21;

$ activate the crpts feature and inverse the boundary
  15 crpts;
     100 inverse Crandall Method adjusted points;
         7 1 31 -37 31;

Help for this command was last updated: 04/03/2000 3:00:00 PM

iPOGO V5 Help Manual On-Line

Group:Command:

19) Adjust Closures19.2 or Transit Closure

Group:
Command:

19) Adjust Closures
19.2 or Transit Closure