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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.

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    Search here for manhattan distance. Here's one question with an answer using PostgreSQL which may give some hints. – mkennedy Jul 10 '15 at 19:24
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You can use the network analysis extension compatible with gvSIG 1.12. It can be installed from the gvSIG add-ons manager (menu Tools > Add-ons manager, select the “Installation from URL” option, and the “org.gvsig.graph (1.1.0-1241 version)” plugin)

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