SSN2

What the maker publishes

Data handling

SSN2 imports stream edges, observed sites, and optional prediction sites from a non-proprietary .ssn folder. source

Dependencies

SSN2 imports sf for spatial data handling and spmodel for modeling functions, among other R packages. source

Diagnostics

Available functions include model augmentation, influence diagnostics, leave-one-out cross-validation, and fitted-model diagnostic plots. source

Installation

The site documents installation from CRAN and GitHub. source

Intended use

The package is designed for users fitting spatial stream network models to stream data, such as modeling stream phenomena and predicting values across a network. source

License

The project is licensed under the GNU General Public License, GPL-3. source

Mapping

The package includes mapping and other graphical functions, and its introduction uses ggplot2 and sf for visualizations. source

Modeling

It fits spatial linear models, including explanatory variables, using restricted or unrestricted maximum likelihood. source

Model types

It supports linear and generalized linear spatial stream network models. source

Predictions

The package fits and summarizes spatial stream network models and predicts at unobserved locations (Kriging). source

Preprocessing

The documentation recommends the SSNbler R package to prepare input data for SSN2. source

Purpose

SSN2 is an R package for spatial statistical modeling and prediction on stream networks, including models based on in-stream distance. source

Spatial components

Its models can include tail-up, tail-down, Euclidean, and spatially independent nugget error components. source

Support

Users can get help by opening a GitHub issue, emailing the SSN support team, or posting on Stack Overflow or Cross Validated. source

Checked against the maker's pages on 5 Oct 2026.