Calculate distance between two coordinates along lines

[المشرف العام]

I have a map with two layers: a map of the streets of Montevideo, and a map of shops with the lat long location. I would like to calculate the distance between each shop and the nearest one, along the streets (not a line between the locations).

Is there any tool that could help me with this? I am using gvSIG.


Thanks in advance.Joaqu

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