Obtain coordinate system metadata from various data formats. There are functions to extract a 'CRS' (coordinate reference system, < https://en.wikipedia.org/wiki/Spatial_reference_system>) in 'EPSG' (European Petroleum Survey Group, < http://www.epsg.org/>), 'PROJ4' < https://proj.org/>, or 'WKT2' (Well-Known Text 2, < http://docs.opengeospatial.org/is/12-063r5/12-063r5.html>) forms. This is purely for getting simple metadata from in-memory formats, please use other tools for out of memory data sources.