sen2r is an R package developed by the Institute of Remote Sensing of Environment (IREA) of the Italian National Research Council, with the aim to simplify and speed up several steps commonly needed to process Sentinel-2 data. Recently, an important recognition to the worth and usefulness of this tool came from the ISI journal Computers & Geosciences, publishing the scientific paper “sen2r”: An R toolbox for automatically downloading and preprocessing Sentinel-2 satellite data.
The availability of Sentinel-2 satellite data has been a turning point for a widespread kind of users, which can now take advantage from a dataset sufficiently dense (revisiting time of 5 days) to perform time series analysis, and which is characterised by a decametric resolution that allows to discriminate many natural and agronomic targets.
Data access is free (upon registration to ESA data hub). Although many solutions are available to obtain images (a detailed list is available here), R users should download them manually (or using ESA API Hub) and then perform some preprocessing operations before being able to use them (e.