@BeginModule
@NewPage
@Name      = Gridboxstat
@Title     = Statistical values over grid boxes
@Section   = Statistical values
@Class     = Statistic
@Arguments = ifile ofile
@Operators = gridboxmin gridboxmax gridboxsum gridboxmean gridboxavg gridboxstd gridboxstd1 gridboxvar gridboxvar1

@BeginDescription
This module computes statistical values over surrounding grid boxes.
According to the chosen operator the minimum, maximum, sum, average, 
variance, or standard deviation of the neighboring grid boxes is written to @file{ofile}.
All gridbox operators only works on quadrilateral curvilinear grids.
@EndDescription
@EndModule


@BeginOperator_gridboxmin
@Title     = Gridbox minimum
@Parameter = nx ny

@BeginDescription
Minimum value of the selected grid boxes.
@EndDescription
@EndOperator


@BeginOperator_gridboxmax
@Title     = Gridbox maximum
@Parameter = nx ny

@BeginDescription
Maximum value of the selected grid boxes.
@EndDescription
@EndOperator


@BeginOperator_gridboxsum
@Title     = Gridbox sum
@Parameter = nx ny

@BeginDescription
Sum of the selected grid boxes.
@EndDescription
@EndOperator


@BeginOperator_gridboxmean
@Title     = Gridbox mean
@Parameter = nx ny

@BeginDescription
Mean of the selected grid boxes.
@EndDescription
@EndOperator


@BeginOperator_gridboxavg
@Title     = Gridbox average
@Parameter = nx ny

@BeginDescription
Average of the selected grid boxes.
@EndDescription
@EndOperator


@BeginOperator_gridboxvar
@Title     = Gridbox variance
@Parameter = nx ny

@BeginDescription
Variance of the selected grid boxes. Divisor is n.
@EndDescription
@EndOperator


@BeginOperator_gridboxvar1
@Title     = Gridbox variance
@Parameter = nx ny

@BeginDescription
Variance of the selected grid boxes. Divisor is (n-1).
@EndDescription
@EndOperator


@BeginOperator_gridboxstd
@Title     = Gridbox standard deviation
@Parameter = nx ny

@BeginDescription
Standard deviation of the selected grid boxes. Divisor is n.
@EndDescription
@EndOperator


@BeginOperator_gridboxstd1
@Title     = Gridbox standard deviation
@Parameter = nx ny

@BeginDescription
Standard deviation of the selected grid boxes. Divisor is (n-1).
@EndDescription
@EndOperator


@BeginParameter
@Item = nx
INTEGER  Number of grid boxes in x direction
@Item = ny
INTEGER  Number of grid boxes in y direction
@EndParameter


@BeginExample
To compute the mean over 10x10 grid boxes of the input field use:
@BeginVerbatim
   cdo gridboxmean,10,10 ifile ofile
@EndVerbatim
@EndExample
