Determines Pfafstetter codes for a dendritic network with total drainage area, levelpath, and topo_sort attributes.

get_pfaf(x, max_level = 2, status = FALSE)

Arguments

x

sf data.frame with ID, toID, totda, outletID, topo_sort, and levelpath attributes.

max_level

integer number of pfaf levels to attempt to calculate. If the network doesn't have resolution to support the desired level, unexpected behavior may occur.

status

boolean print status or not

Value

data.frame with ID and pfaf columns.

Examples

# \donttest{
library(dplyr)
source(system.file("extdata/nhdplushr_data.R", package = "nhdplusTools"))
hr_flowline <- align_nhdplus_names(hr_data$NHDFlowline)

fl <-  select(hr_flowline, COMID, AreaSqKM) %>%
  right_join(prepare_nhdplus(hr_flowline, 0, 0,
                             purge_non_dendritic = FALSE,
                             warn = FALSE),
             by = "COMID") %>%
  sf::st_sf() %>%
  select(ID = COMID, toID = toCOMID, area = AreaSqKM)

fl$nameID = ""
fl$totda <- calculate_total_drainage_area(sf::st_set_geometry(fl, NULL))
fl <- left_join(fl, get_levelpaths(rename(sf::st_set_geometry(fl, NULL),
                                   weight = totda)), by = "ID")

pfaf <- get_pfaf(fl, max_level = 3)

fl <- left_join(fl, pfaf, by = "ID")

plot(fl["pf_level_3"], lwd = 2)


pfaf <- get_pfaf(fl, max_level = 4)

hr_catchment <- left_join(hr_data$NHDPlusCatchment, pfaf, by = c("FEATUREID" = "ID"))

colors <- data.frame(pf_level_4 = unique(hr_catchment$pf_level_4),
                     color = sample(terrain.colors(length(unique(hr_catchment$pf_level_4)))),
                    stringsAsFactors = FALSE)
hr_catchment <- left_join(hr_catchment, colors, by = "pf_level_4")
plot(hr_catchment["color"], border = NA, reset = FALSE)
plot(sf::st_geometry(hr_flowline), col = "blue", add = TRUE)


source(system.file("extdata", "walker_data.R", package = "nhdplusTools"))

fl <- select(walker_flowline, COMID, AreaSqKM) %>%
  right_join(prepare_nhdplus(walker_flowline, 0, 0,
                            purge_non_dendritic = FALSE, warn = FALSE),
            by = "COMID") %>%
  sf::st_sf() %>%
  select(ID = COMID, toID = toCOMID, area = AreaSqKM)

fl$nameID = ""
fl$totda <- calculate_total_drainage_area(sf::st_set_geometry(fl, NULL))
fl <- left_join(fl, get_levelpaths(rename(sf::st_set_geometry(fl, NULL),
                                   weight = totda)), by = "ID")

pfaf <- get_pfaf(fl, max_level = 2)

fl <- left_join(fl, pfaf, by = "ID")

plot(fl["pf_level_2"], lwd = 2)

# }