This module computes a surface from all 3D variables. The result is a horizonal 2D field.
cdo_bottomvalue(ifile, isovalue = NULL, ofile = NULL)cdo_isosurface(ifile, isovalue = NULL, ofile = NULL)
cdo_topvalue(ifile, isovalue = NULL, ofile = NULL)
Operators that output one or more files return a character vector to the output files.
Operators that output an indefinite number of files return a string with the basename of the files.
Operatos that don't return filenames return a character vector with the string output.
String with the path to the input file.
FLOAT - Isosurface value
String with the path to the output file.
bottomvalue Extract bottom level
This operator selects the valid values at the bottom level.
The NetCDF CF compliant attribute positive is used to determine where top and bottom are.
If this attribute is missing, low values are bottom and high values are top.
topvalue Extract top level
This operator selects the valid values at the top level.
The NetCDF CF compliant attribute positive is used to determine where top and bottom are.
If this attribute is missing, low values are bottom and high values are top.
isosurface Extract isosurface
This operator computes an isosurface. The value of the isosurfce is specified by the parameter isovalue.
The isosurface is calculated by linear interpolation between two layers.