My goal is to find the total length of roads per county for a particular state. You would think there would be a simple government spreadsheet with this information in it....
I cannot figure out how to find the summed lengths of a polyline layer(roads) in each county (polygon) in QGIS. I have tried using Vector-> Analysis -> Sum line lengths but it just reproduces the county shapefile with a length column, of which I have no idea what unit it is in.
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