.hydroplotseasonal: no visible global function definition for
  'plot.xts'
.hydroplotts: no visible global function definition for 'plot.xts'
daily2annual.zoo: no visible global function definition for 'time<-'
dm2seasonal.zoo: no visible global function definition for 'time<-'
drawTimeAxis: no visible global function definition for 'index'
dwi.zoo: no visible global function definition for 'index'
gists2spt: no visible global function definition for 'coordinates<-'
gists2spt: no visible global function definition for 'proj4string<-'
hydrokrige.data.frame: no visible global function definition for 'CRS'
hydrokrige.data.frame: no visible global function definition for
  'proj4string<-'
hydrokrige.data.frame: no visible global function definition for
  'spsample'
hydrokrige.data.frame: no visible global function definition for
  'gridded<-'
hydrokrige.default: no visible global function definition for 'CRS'
hydrokrige.default: no visible global function definition for
  'proj4string<-'
hydrokrige.default: no visible global function definition for
  'spsample'
hydrokrige.default: no visible global function definition for
  'gridded<-'
hydrokrige.default: no visible global function definition for 'overlay'
hydrokrige.default: no visible global function definition for
  'SpatialPoints'
hydrokrige.default: no visible global function definition for
  'layout.north.arrow'
hydrokrige.default: no visible global function definition for
  'layout.scale.bar'
izoo2rzoo.zoo: no visible global function definition for 'time<-'
matrixplot: no visible global function definition for 'levelplot'
mspplot: no visible global function definition for 'CRS'
mspplot: no visible global function definition for 'coordinates<-'
mspplot: no visible global function definition for 'proj4string<-'
mspplot: no visible global function definition for 'SpatialPoints'
mspplot: no visible global function definition for 'layout.north.arrow'
mspplot: no visible global function definition for 'layout.scale.bar'