Find the distance to the closest upstream lake, the number of upstream lakes, and the area of upstream lakes — closest_lake_distance • streamnet

Find the distance to the closest upstream lake, the number of upstream lakes, and the area of upstream lakes

closest_lake_distance(lines, lakes, outlet, size_threshold = 4,
  map = FALSE)

Arguments

lines: sf lines object
lakes: sf polygon object
outlet: integer row index of outlet reach relative to lines
size_threshold: numeric size above which to consider as a lake
map: logical show a map output of the results?

Value

a list with the following elements:

Closest lake distance
Number of upstream lakes
Upstream lake area

Examples

if (FALSE) {
library(nhdR)

data(nhd_sub_lines)
data(nhd_sub_lakes)

outlet_reach   <- terminal_reaches(network = nhd_sub_lines,
                                   approve_all_dl = TRUE)
outlet <- which(outlet_reach[['comid']] == nhd_sub_lines[['comid']])

closest_lake_distance(nhd_sub_lines, nhd_sub_lakes, outlet = outlet)
}