R/geoconvert.R

In geo: Draw and Annotate Maps, Especially Charts of the North Atlantic

geoconvert <-
function(data, inverse = F, col.names = c("lat", "lon"))
{
	if(!inverse) {
		if(is.data.frame(data)) {
			if(any(is.na(match(col.names, names(data))))) {
				cat(paste("Columns", colnames, "do not exist"))
				return(invisible())
			}
			data[, col.names[1]] <- geoconvert.1(data[, col.names[
				1]])
			data[, col.names[2]] <- geoconvert.1(data[, col.names[
				2]])
		}
		else data <- geoconvert.1(data)
	}
	else {
		# Convert to write out. 
		if(is.data.frame(data)) {
			if(any(is.na(match(col.names, names(data))))) {
				cat(paste("Columns", colnames, "do not exist"))
				return(invisible())
			}
			data[, col.names[1]] <- geoconvert.2(data[, col.names[
				1]])
			data[, col.names[2]] <- geoconvert.2(data[, col.names[
				2]])
		}
		else data <- geoconvert.2(data)
	}
	return(data)
}