Convert x,y point locations on the line and a distance (negative is left of line for the direction of travel) for a series of points in a strip.
vector with named components of x0,y0,x1,y1; line traverses from (x0,y0) to (x1,y1)
dataframe of x,y,distance for each observed point; x,y is the location on the line that is perpendicular to the object; a negative distance implies it is on the left side of the line as defined by the direction of travel
pts dataframe with x,y locations of the objects offset from the line at the appropriate distance and side.
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