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[Help] Automate Feature Extraction (Roads/Buildings)

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Hi guys,
i am working with a big raster image on arcgis, specially digitizing tools, and the major challenge is the time and the accuracy, so far i consume many time to digitize small village, specially, i am working with medium resolution raster image, not high resolution, any way, i am know about Emagine Objictive which erdas imagine having it, also i have
envi ex , feature objex in pci geomatica, so i want to know what is the best product which working with image to feature extract on low or medium resolution image(emagine objective, envi ex, feature objex,), i just want to extract roads and buildings, and is there any other products perfectly working on extract roads and buildings.

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