Hi there:

I am trying to find the actual formula to calculate the length of the 
common border between adjacent  polygons. So far I've been using:

- Let r1 and r2 be the perimeters of Polygons 1 and 2.
- Make R = r1 + r2
- Make r = perimeter of the union between r1 and r2
- Length of common border = (R - r)/2

 
  This seems to work well if the common border is a single line segment, yet 
if the common border is comprised by more than one segment (two or more 
disjoint line segments), it will not work.

   Any help would be greatly appreciated.

Regards

Gaston
 
Lic. Gastón Pezzuchi
Magister UNIGIS en Sistemas de Información Geográfica

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