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urban planning geographic information system planejamento urbano participação popular pp-sig cartografia digital elevation data geostatistics spring interactivsurfaces sensing technology touch screen gis land value weighted overlay urban management porto alegre supervised classification and remote sensing unsupervised classification statistics histogram touchscreen sig-sul opendata gidday ²µ±ð²õ³Ùã´Ç±èú²ú±ô¾±³¦²¹ dadosabertos