line_length: Calculate line length by category within buffers of points
In gisUTM/lur: Land use regression package.

For a set of points, buffer each point and calculate the total length of surronding lines by type. Often used to calculate the length of road by type.

1 2	line_length(points, IDs, buffer_size, lines, categories, shorten_names = TRUE)

`points`	Spatial points object
`IDs`	Unique ID field in points
`buffer_size`	Radius used to buffer points.
`lines`	Spatial lines object, which contains road classes
`categories`	Road types in the spatial line object
`shorten_names`