Some big changes in sp and other spatial packages in the recent releases

[emrehanks]

Dear Users,
There were some big changes in sp and other spatial packages in the recent releases. Therefore, "sp" and "rgdal" libraries should be downgraded to an older version.

For sp (< 1.4-2) and rgdal (< 1.5-8).

Note: To the prevention of "sp" and "rgdal" packages warning massages, this code ("rgdal::set_thin_PROJ6_warnings(TRUE)") could be used.

Best regards Emrehan K. Sahin