get_adjacency: Construct a Stream Network Adjacency Matrix
In alastairrushworth/smnet: Smoothing for Stream Network Data

Description Usage Arguments Value Author(s) See Also

View source: R/get_adjacency.R

Builds a sparse adjacency matrix from a user specified SSN data directory, by extracting and processing the binaryID.db table. The resulting output of this function is required input for fitting spatial additive network models to SSN objects using the main smnet function.

1	get_adjacency(ssn_directory, netID = 1)

`ssn_directory`	Required character string indicating the path to the location of the .ssn directory which contains the binaryID.db table.
`netID`	Logical. Integer specifying the particular stream network of interest within the `SSN` object. Defaults to 1.

List object with components

adjacency: Sparse adjacency matrix of class spam with row and column dimension equal to the number of stream segments. If the i^th column has non-zero elements j_1 and j_2 then this indicates that j_1 and j_2 are direct upstream neighbours of i. If the i^th column has sum 1, then this indicates that i has only one upstream neighbour, and therefore no confluence lies between them; by default the spatial penalties treat these differently.
bid: Character vector of binary identifiers for each stream segment, used only for automatic calculation of Shreve's stream order within smnet