SSN2

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Freedom report

One barScore 5.3

Free tierNo free tier on record
Open codeNo open-source code on record
Runs widely0 of 6 device platforms
DocumentedPlans, terms and facts published

SSN2 is ranked #35 of 63 in GIS software on Freedom251.

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Free plan: Yes
Deployment: desktop
Spatial analysis: advanced

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The record

Purpose: SSN2 is an R package for spatial statistical modeling and prediction on stream networks, including models based on in-stream distance.
Modeling: It fits spatial linear models, including explanatory variables, using restricted or unrestricted maximum likelihood.
Predictions: The package fits and summarizes spatial stream network models and predicts at unobserved locations (Kriging).
Model types: It supports linear and generalized linear spatial stream network models.
Spatial components: Its models can include tail-up, tail-down, Euclidean, and spatially independent nugget error components.
Data handling: SSN2 imports stream edges, observed sites, and optional prediction sites from a non-proprietary .ssn folder.
Preprocessing: The documentation recommends the SSNbler R package to prepare input data for SSN2.
Diagnostics: Available functions include model augmentation, influence diagnostics, leave-one-out cross-validation, and fitted-model diagnostic plots.
Mapping: The package includes mapping and other graphical functions, and its introduction uses ggplot2 and sf for visualizations.
Dependencies: SSN2 imports sf for spatial data handling and spmodel for modeling functions, among other R packages.
Installation: The site documents installation from CRAN and GitHub.
License: The project is licensed under the GNU General Public License, GPL-3.
Support: Users can get help by opening a GitHub issue, emailing the SSN support team, or posting on Stack Overflow or Cross Validated.
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.

Where it ranks on Freedom251

Best GIS Software in 2026#35 of 63

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Sources

usepa.github.io/SSN2/· checked 5 Oct 2026
usepa.github.io/SSN2/articles/introduction.html· checked 5 Oct 2026
usepa.github.io/SSN2/reference/index.html· checked 5 Oct 2026