Roll to sf?

[MikkoVihtakari]

The ggOceanMaps package is currently written mostly using the sp package. This is because when I started writing the processor, PlotSvalbard, sp was the spatial package for R. Things have changed with the PROJ6 shift and nowadays sf appears superior to sp. Shift to sf would require rewriting most of ggOceanMaps code and make it not compatible with current ggOceanMapsData files. It would however improve stability, reduce the shapefile file size, make code easier to debug, make ggOceanMaps more flexible and work better with coord_sf(), and perhaps even make plotting the maps quicker.

I, however, do not have time to do this work alone. Would there be someone interested in participating in the development of ggOceanMaps? Any thoughts about the shift to sf?

[MikkoVihtakari]

Completed: https://github.com/mikkovihtakari/ggoceanmaps/tree/sf-version