Dear all,

I have a set of shapefiles which contents are polygons.
I would like to know if is there a way of I obtain the links between the polygons, something like a "polygon spanning tree". For point patterns I can use de spatstat package, but I need to do it for polygons.

Below I send a sample of what I need as output.

mydatafile<-read.table(stdin(),head=T,sep=",")
x,y,y2
5,5,
5,30,
45,35,
50,16.5,
5,5,
NA,,
30,80,
30,102.4,
60,120,
60,100,
65,95,
50,80,
30,80,
NA,,
72.3,94.4,
80,110,
100,110,
100,60,
70,70,
70,80,
72.3,95.1,
NA,,
40,60,
40,50,
60,50,
60,60,
40,60,
NA,,
15,70,
15,55,
20,55,
20,70,
15,70,
NA,,
2,100,
2,80,
10,80,
17.1,108,
2,100,
NA,,
70,20,
101.6,20,
90,45.6,
70,35,
70,20,
NA,,
10,,80
15,,70
NA,,
30,,80
20,,70
NA,,
40,,60
20,,60
NA,,
17,,108
30,,102
NA,,
17.5,,55
17.5,,30
NA,,
50,,80
50,,60
NA,,
65,,95
72,,94
NA,,
60,,60
70,,70
NA,,
45,,50
45,,35
NA,,
60,,50
70,,35
NA,,
2,,80
5,,30
NA,,
50,,16
70,,20
NA,,
90,,45
100,,60


plot(y~x,data=mydatafile,type="l")
lines(y2~x,data=mydatafile,type="l",col="orange1",lty=2)

Kind regards,

Miltinho/Brazil



 para armazenamento!

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