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

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

This R package helps to bring the municipal states together.

A good starting point isthis vignettearticle.

The Swiss Municipal Data Merger Tool automatically detects thesemutations and maps municipalities over time, i.e. municipalities of anold state to municipalities of a new state. This functionality ishelpful when working with datasets that are based on different spatialreferences like for example Swiss voting data.

# Install released version from CRANinstall.packages("SMMT")

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

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

• SMMT onCRAN
• For more background details, seethisarticlein the Swiss Political Science Review.

• eCH-0071 Datenstandard Historisiertes Gemeindeverzeichnis derSchweiz: The Swiss municipalinventory is a well documented data standard which can be consulted atthis webpage.