creates a node topology table from an edge topology
Usage
make_node_topology(x, add_div = NULL, add = TRUE)
# S3 method for class 'data.frame'
make_node_topology(x, add_div = NULL, add = TRUE)
# S3 method for class 'hy'
make_node_topology(x, add_div = NULL, add = TRUE)Arguments
- x
data.frame network compatible with hydroloom_names.
- add_div
data.frame of logical containing id and toid diverted paths to add. Should have id and toid fields. If TRUE, the network will be interpreted as a directed acyclic graph with downstream divergences included in the edge topology.
- add
logical if TRUE, node topology will be added to x in return.
Value
data.frame containing id, fromnode, and tonode attributes or all attributes provided with id, fromnode and tonode in the first three columns.
If add_div is TRUE, will also add a divergence attribute where the
provided diverted paths are assigned value 2, existing main paths that
emanate from a divergence are assigned value 1, and all other paths
are assigned value 0.
Examples
x <- sf::read_sf(system.file("extdata/new_hope.gpkg", package = "hydroloom"))
y <- dplyr::select(add_toids(x), -ToNode, -FromNode)
y <- make_node_topology(y)
#> Warning: nhdplusTools make_node_topology is deprecated. Use hydroloom version.
# just the divergences which have unique fromids in x but don't in new hope.
div <- add_toids(dplyr::select(x, COMID, FromNode, ToNode),
return_dendritic = FALSE)
div <- div[div$toid %in%
x$COMID[x$Divergence == 2],]
y <- dplyr::select(add_toids(x), -ToNode, -FromNode)
y <- make_node_topology(y, add_div = div)
#> Warning: nhdplusTools make_node_topology is deprecated. Use hydroloom version.