Traverse NHDPlus network upstream with tributaries
get_UT(network, comid, distance = NULL)
data.frame NHDPlus flowlines including at a minimum: COMID, Pathlength, LENGTHKM, and Hydroseq.
integer Identifier to start navigating from.
numeric distance in km to limit how many COMIDs are returned. The COMID that exceeds the distance specified is returned.
integer vector of all COMIDs upstream with tributaries of the starting COMID.
library(sf) source(system.file("extdata", "sample_flines.R", package = "nhdplusTools")) plot(sample_flines$geom) start_COMID <- 11690196 UT_COMIDs <- get_UT(sample_flines, start_COMID) plot(dplyr::filter(sample_flines, COMID %in% UT_COMIDs)$geom, col = "red", add = TRUE) UT_COMIDs <- get_UT(sample_flines, start_COMID, distance = 50) plot(dplyr::filter(sample_flines, COMID %in% UT_COMIDs)$geom, col = "blue", add = TRUE)