Freshwater Atlas Locate Along

Gets the point on a stream corresponding to the river metre (downstream route measure).

fwa_locate_along(
  blue_line_key,
  downstream_route_measure = 0,
  bbox = NULL,
  properties = NULL,
  transform = NULL,
  epsg = 4326,
  nocache = getOption("fwa.nocache", FALSE)
)

Arguments

blue_line_key

A positive whole number of the stream blue line key.

downstream_route_measure

A positive number of the river metre.

bbox

A vector of four numbers indicating bounding box to limit output features to, e.g. c(minLon, minLat, maxLon, maxLat).

properties

A vector of strings of the column names to include. If NULL (default), all columns are retained.

transform

A character vector with the name of the valid transform function followed by the parameter values (e.g. c("ST_Simplify", 100))

epsg

A positive whole number of the epsg to transform features to.

nocache

A flag specifying whether or not to cache results.

Value

An sf object.

See also

API documentation

Other functions: fwa_index_point(), fwa_locate_along_interval(), fwa_watershed_at_measure(), fwa_watershed_hex(), fwa_watershed_stream(), hydroshed()

Examples

fwa_locate_along(356308001, downstream_route_measure = 10000)
#> Simple feature collection with 1 feature and 0 fields
#> Geometry type: POINT
#> Dimension:     XYZ
#> Bounding box:  xmin: -121.9504 ymin: 49.15144 xmax: -121.9504 ymax: 49.15144
#> z_range:       zmin: 10.5 zmax: 10.5
#> Geodetic CRS:  WGS 84
#> # A data frame: 1 × 1
#>                      geometry
#> *                 <POINT [°]>
#> 1 Z (-121.9504 49.15144 10.5)