how is it possible to extract the roads, canals and or railways out of this image (black-white)?
Or how is possible to create lines at the edges of the roads, canals and or railways?
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niels
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This related post may be of interest: http://gis.stackexchange.com/a/48315/8104. What software are you working with? – Aaron Feb 04 '15 at 15:11
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Qgis or Arcgis, but normally some other free software is also possible – niels Feb 04 '15 at 18:44