[UW-GIS-L] Calculating distance

[Harvey Greenberg]

Assuming that you have line segments that are not necessarily vertical, 
I would write a nested loop at the arcedit command line.  Conceptually:
for each point, use the show function to set variable to X and Y
  set bestyet = 9999
  for each line, use the show function to set variable to X1, Y1, X2 and Y2
     if Y1 < Y < Y2  or Y1 > Y > Y2
       if X1 < X or X2 < X
         if (X1<X) and (X2<X) or (algebra shows that the line is to the 
west)
             do some algebra for point-to-line distance (or export 
candidate lines and use the NEAR command)
              adjust result if intercept > Y2 or < Y1
               if distance < bestyet
                 save distance and line id

This is tedious to write in aml (or any language), and it will run 
slowly (how many points and lines do you have?), but:
   if I understand the question correctly
     if you want to try this
       I could help code up the aml

harvey
      
               

Amber L Pearson wrote:
>
> Hello,
> Using vector data, I want to calculate the distance of the nearest 
> line to the WEST of a point (between just west of north and just west 
> of south). Ideas?
>
> Amber L. Pearson
> 2600 NW 56th Street #5
> Seattle, WA 98107
>
>
>
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-- 
hgreen at u.washington.edu  374 Johnson Hall 206-685-7981	
http://gis.ess.washington.edu/

	Harvey Greenberg
	University of Washington
	Department of Earth and Space Sciences
	Box 351310
	Seattle WA 98195-1310