I have point shapefile with lot of attributes, that represent road accidents and line shapefile with highways. What i want is to join attribute into line shapefile with value, that represent number of accidents which happened on each road segment (line segment in shapefile). First idea was to create buffer around line segments which was used to locate accidents, but i dont know what to do next.
I need this to create simple line diagram map (exactly this one http://athena.zcu.cz/kurzy/gish/000/HTML/37/Ob98.jpg) and I want to know some possibilities of cartographic visualization from these data, not only joining number of accidents, but some idea to use attributes in data too. Im talking about simple line diagram map.