New spatial analysis tutorial

Today I have added a new tutorial in the Spatial analysis section of the Quantitative Archaeology Wiki.

Using GRASS, a simple method is shown for performing a basic exploratory analysis on the relationship between settlement sites and landscape variables like elevation and aspect. Further updates to the tutorial will include more screenshots and advanced quantitative analysis.

The tutorial is available at http://wiki.iosa.it/dokuwiki/spatial_analysis:settlements_and_landscape.

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