SOMEnv: An R package for mining environmental monitoring datasets by Self-Organizing Map and k-means algorithms with a graphical user interface

•SOMEnv package can be used for performing Self-Organizing Map analysis.•SOMEnv can be used for mining large datasets from environmental monitoring.•All the calculations and visualization features can be accessed by a Graphical User Interface.•SOMEnv also provides visualization dedicated to high frequency data monitoring.•SOMEnv offers a method to easily identify and visualize outliers.