I have some networks in GIS shape file (vector) format, the data I have are road 
maps that I digitised from satellite images in ArcGIS. (I can change them to 
raster or Ascii), is there a way to convert them into matrix that can be loaded 
and analysed with igraph in R?
I would like nodes to be the points at which two lines/roads cross or a 
line/road turns at a right angle, and, I would like the edges to simply be how 
the various nodes/points are connected, they do not need to be directional or 
contain any information on flow etc.
I would like to get a matrix out that shows how the network is built, 
for example point a and b are connected by edge 1, and point a and c are 
connected by edge 2. 
(Someone on the igraph mailing list suggested that I try this list).

I'm very new to network and spatial analyses, 
Any and all help is really appreciated
Thank you


      
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