Set as.data.frame method for 'PrepGR', 'CalGR' and 'SimGR' classes
Replace as as.data.frame.airGRt
function by as.data.frame
S3 method for class 'PrepGR', 'CalGR' and 'SimGR'
Replace as as.data.frame.airGRt
function by as.data.frame
S3 method for class 'PrepGR', 'CalGR' and 'SimGR'