I have a data set where I have shapefiles for the watercourses in a drainage basin (line/linestring) and locations of dams and other obstructions along them (points). I would like to create a new linestring layer which follows the water course approximately 100m upstream from each point representing a dam. The result of this analysis would be a new layer composed of several lines measuring 100m upstream from a dam/obstruction, but I would also be open to creating new features as opposed to new objects.



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