line2df: Convert SpatialLinesDataFrame objects to a data.frame with from and to coords
Description
This function returns a data frame with fx and fy and tx and ty variables
representing the beginning and end points of spatial line features respectively.
line2df(flowlines[5,]) # beginning and end of a single straight lineline2df(flowlines) # on multiple linesline2df(routes_fast[5:6,]) # beginning and end of routes