The SMMT is an R Package which helps merge municipal level data sets available for different points in time.

If you ever worked with Swiss municipal-level data, you almost certainly encountered the issue that the municipal state of your dataset is not the one you desired. E.g. it’s not the actual municpial state or it does not match the state of a second dataset.

This R package helps to bring the municipal states together.

A good starting point is this vignette article.

The Swiss Municipal Data Merger Tool automatically detects these mutations and maps municipalities over time, i.e. municipalities of an old state to municipalities of a new state. This functionality is helpful when working with datasets that are based on different spatial references like for example Swiss voting data.

# Install released version from CRAN
install.packages("SMMT")

# Install most recent version from github.
devtools::install_github("ValValetl/SMMT")

• Read the vignette vignette("manual") / online
• Look up the documentation of ?map_old_to_new_state

• SMMT on CRAN
• For more background details, see this article in the Swiss Political Science Review.

• eCH-0071 Datenstandard Historisiertes Gemeindeverzeichnis der Schweiz: The Swiss municipal inventory is a well documented data standard which can be consulted at this webpage.