Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Warning: namespace 'rgdal' is not available and has been replaced
  by .GlobalEnv when processing object '<unknown>'
  Note: found 1 marked UTF-8 string