Hi! Thanks for your reply Lluis. I used the GRASS command r.cost commenting, but also gives me error. It also includes a start point and a finish and I only need one start point. I explain what I need to do, to see if I can also help. I created a layer fricion, in which the cells have temporal value. Intend to make a layer of cost in that the cost in time taken to pass through each cell is determined. It starts from a point (the archaeological site) and no end, the extension would be the entire layer of friction. Subsequently, the resulting layer is reclassified to determine territories around the site. This in gvSIG with Sexante is done easily, but if it is assumed that Sexante included in the QGIS version 2.2 with which I work, I do not see it anywhere.
I would like to perform with QGIS to only work with a program, so would appreciate if someone can tell me how. Best Regards Andres Ocaña
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