Nothing
`aggregateHalfDegreeGridToCountries` <-
function( inFile=""
,aggregateOption="sum" #"mean","max","min"
)
{
#a function to aggregate half degree grid data to country level
#based upon a grid country file obtained from IIASA
#returns a dataframe with numeric country code & aggregated values
#can do sum, mean, max or min
#require(maptools)
#can fail to load data without this
#require(sp)
#sGDF <- readAsciiGrid(fname=inFile)
#added an option to work on an existing loaded spatialGridDataFrame
if ( is.character(inFile) )
{
if ( !file.exists(inFile) )
{
warning("the file: ",inFile," seems not to exist, exiting aggregateHalfDegreeGridToCountries()\n")
return(FALSE)
}
#reading file into a SpatialGridDataFrame
sGDF <- readAsciiGrid(fname=inFile)
} else if ( class(inFile)=="SpatialGridDataFrame" )
{
#if its already a SpatialGridDataFrame just copy it
#!!!! 6/3/09 this allows for the potential for multiple attribute columns
#!!!! which is not coped with below
sGDF <- inFile
} else
{
warning(inFile," seems not to be a valid file name or a SpatialGridDataFrame, exiting aggregateHalfDegreeGridToCountries()\n")
}
#further checking grid resolution
if ( gridparameters(sGDF)$cellsize[1]!=0.5 )
warning(inFile," seems not to be a half degree grid, in aggregateHalfDegreeGridToCountries()\n")
#prompting user for file to open
#if ( inFile == "" ) inFile <- tclvalue(tkgetOpenFile(title="choose a data file to plot"))
#getting data from within package
#data("gridCountriesNumeric",envir=environment(),package="rworldmap")
#sGDFcountries <- get("gridCountriesNumeric")
#25/03/2013 replacing grid file with updated countries
data(gridCountriesDegreesHalf,envir=environment(),package="rworldmap")
sGDFcountries <- get("gridCountriesDegreesHalf")
#sGDFcountries <- gridCountriesDegreesHalf
#getting the names of the columns containing the data
attrNameGrid <- names(sGDF)[1]
attrNameGridCountries <- names(sGDFcountries)[1]
dF <- data.frame(attribute = sGDF[[attrNameGrid]]
,UN = sGDFcountries[[attrNameGridCountries]])
#4 aggregate cell values by numeric country code
#! later offer option for user to specify which
dFbyCountry <- aggregate(dF$attribute
#, by=list(ISO3166_numeric = dF$ISO3166_numeric)
, by=list(UN = dF$UN)
, FUN = aggregateOption
, na.rm=TRUE )
#, mean, na.rm=TRUE )
#renaming the aggregated column name from x, with filename if the input was a file (if a sGDF it causes error use names instead)
if ( is.character(inFile) )
{
names(dFbyCountry)[2] <- paste(aggregateOption,"_",basename(inFile), sep='')
} else #if inFile is a sGDF
{
#!!!6/3/09 this causes an error if the SGDF contained multiple attribute columns
#!!!
names(dFbyCountry)[2] <- paste(aggregateOption,"_",names(inFile), sep='')
}
return(dFbyCountry)
} #end of aggregateHalfDegreeGridToCountries()
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