Found the following math rendering problems:
topo.Rd:20: Undefined control sequence: \textsuperscript in \textsuperscript{TM}
Found the following math rendering problems:
topo.Rd:20: Undefined control sequence: \textsuperscript in \textsuperscript{TM}
Namespaces in Imports field not imported from:
  ‘raster’ ‘sp’
  All declared Imports should be used.
Found the following math rendering problems:
topo.Rd:20: Undefined control sequence: \textsuperscript in \textsuperscript{TM}
Namespaces in Imports field not imported from:
  ‘raster’ ‘sp’
  All declared Imports should be used.
Found the following math rendering problems:
topo.Rd:20: Undefined control sequence: \textsuperscript in \textsuperscript{TM}
Found the following math rendering problems:
topo.Rd:20: Undefined control sequence: \textsuperscript in \textsuperscript{TM}
Namespaces in Imports field not imported from:
  ‘raster’ ‘sp’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘raster’ ‘sp’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘raster’ ‘sp’
  All declared Imports should be used.
Namespaces in Imports field not imported from:
  ‘raster’ ‘sp’
  All declared Imports should be used.