Computes three different summary statistics: (1) TotalArea total area of each polygon; (2) TotalLength total length of a multilinestring object within a polygon (3) Ratio ratio between TotalLength and TotalArea i.e. the ratio between the total length and total area of a higher-order geography polygon.

line_calc(line_layer, higher_geo_lay, unique_id_code, crs)



multilinestring object of class sf, sfc or sfg.


multipologon object of class sf, sfc or sfg.


a string; indicating a unique ID column of higher_geo_lay, used as the summary areas.


coordinate reference system: integer with the EPSG code, or character based on proj4string.


a tibble data frame object containing four columns:

the unique_id_code of higher_geo_lay

the total area of each polygon in higher_geo_lay (TotalArea)

the total length of line_layer features (TotalLength)

the ratio between the total length of line_layer and the the total area of higher_geo_lay polygon (Ratio).


## Run line_calc() using the packages' dummy data sets. ## The data sets are georeferenced on wgs84. However, a planar system is used to measure areas. ## For the examples provided here, points and polygons relate to the United Kingdom. ## So the British National Grid is used. ## Not run: #outcome <- line_calc( # line_layer = lines, # higher_geo_lay = pol_large, # unique_id_code = "large_pol_", # crs = "epsg:27700") ## End(Not run)