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define list os cities to be incorporated in the analysis
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Download GTFS feeds
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Download Pol-administrative polygons (admin_poly) source: http://www.gadm.org/
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Download Population grid Population residing in each 100x100m grid cell source: http://www.worldpop.org.uk/data/summary/?contselect=America&countselect=Brazil&typeselect=Population
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complicated part: Decide the boundaries of cities in the admin_poly
Analise na escala do municipio? area metropolitana?
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Clip population data to match admin_poly
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buffer stops with pop data
gBuffer {rgeos}
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analyze stats
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plot maps and charts