Freshwater Atlas Locate Along Interval

Gets a regularly spaced set of points between two river metres.

fwa_locate_along_interval(
  blue_line_key,
  interval_length = 100,
  start_measure = 0,
  end_measure = NULL,
  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.

interval_length

An integer of the interval distance in meters.

start_measure

An integer of the distance in meters upstream from the river mouth to start from.

end_measure

An integer of the distance in meters upstream from the river mouth to end at.

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(), fwa_watershed_at_measure(), fwa_watershed_hex(), fwa_watershed_stream(), hydroshed()

Examples

fwa_locate_along_interval(356308001, interval_length = 10, start_measure = 0)
#> Simple feature collection with 1924 features and 2 fields
#> Geometry type: POINT
#> Dimension:     XYZ
#> Bounding box:  xmin: -122.0155 ymin: 49.11263 xmax: -121.8697 ymax: 49.16804
#> z_range:       zmin: 7.5 zmax: 214.8791
#> Geodetic CRS:  WGS 84
#> # A data frame: 1,924 × 3
#>    downstream_route_measure index                        geometry
#>  *                    <int> <int>                     <POINT [°]>
#>  1                        0     0    Z (-122.0155 49.16804 9.626)
#>  2                       10     1 Z (-122.0154 49.16795 9.643175)
#>  3                       20     2 Z (-122.0154 49.16787 9.660349)
#>  4                       30     3 Z (-122.0153 49.16778 9.677524)
#>  5                       40     4  Z (-122.0153 49.1677 9.694698)
#>  6                       50     5 Z (-122.0152 49.16762 9.711873)
#>  7                       60     6 Z (-122.0152 49.16753 9.729048)
#>  8                       70     7 Z (-122.0151 49.16745 9.746222)
#>  9                       80     8 Z (-122.0151 49.16736 9.763397)
#> 10                       90     9  Z (-122.015 49.16728 9.780571)
#> # ℹ 1,914 more rows