Get Hydro Location

Source: R/index_nhdplus.R

given a flowline index, returns the hydrologic location (point) along the specific linear element referenced by the index.

get_hydro_location(indexes, flowpath)

Arguments

indexes

data.frame as output from get_flowline_index.

flowpath

data.frame with three columns: COMID, FromMeas, and ToMeas as well as geometry.

Examples

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

indexes <- get_flowline_index(sample_flines,
                   sf::st_sfc(sf::st_sfc(list(sf::st_point(c(-76.86934, 39.49328)),
                                              sf::st_point(c(-76.91711, 39.40884)),
                                              sf::st_point(c(-76.88081, 39.36354))),
                              crs = 4326)))

get_hydro_location(indexes, sample_flines)
#> Geometry set for 3 features 
#> Geometry type: POINT
#> Dimension:     XY
#> Bounding box:  xmin: -76.91761 ymin: 39.3633 xmax: -76.8694 ymax: 39.49326
#> Geodetic CRS:  WGS 84
#> POINT (-76.8694 39.49326)
#> POINT (-76.91761 39.40909)
#> POINT (-76.881 39.3633)