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*Scripts for parsing GrADS .ctl files -Author: Takeshi Enomoto -History: 18 Aug 2005 v0.3: bug fix. hours were obtained incorrectly 25 Feb 2005 v0.2: bug fixes. grads_time() now returns a useful array 22 Feb 2005 v0.1: first release This suites consists of awk and ncl scripts. *awk scripts **scripts to read file meta information: -dset.awk: returns the path to the data file -title.awk: returns the title -undef.awk: returns the undefined value **scripts to read coordinates and their meta information: -xdef.awk: returns x coordinates -ydef.awk: returns y coordinates -yrev.awk: returns -1 if option yrev is found 1 if not -zdef.awk: returns z coordinates -zrev.awk: returns -1 if option zrev is found 1 if not -tdef.awk: returns number of records, units, and increment **scripts to read variables meta information: -varnames.awk: returns variable names -varlevs.awk: returns the number of levels for each variable -vardescs.awk: returns the description (long name) for each variable -varid.awk: returns the place of a give variable name in all variables *ncl utility script **grads.ncl Install .awk and .ncl scripts to appropriate directory. Here it is assumed that they are installed in: $HOME/lib/ncarg/nclscripts/grads/ To use this script first load this script before "begin" statement. load "$HOME/lib/ncarg/nclscripts/grads/grads.ncl" To read meta data use grads_addfile() function. It simply returns the name of the input but with meta data such as coordinates as attributes. f = grads_addfile("path/to/your/control/file.ctl") Available attributes are: -grd: path to the data file ("DSET") -title: "TITLE" -undef: "UNDEF" -lon: x coorinates -lat: y coorinates -lev: z coorinates -varnames: names of variables -varlevs: the number of levels for each variable -vardescs: description (long name) of each variable -offsets: offset of each variable from the start of the record -nlevs: total number of levels per record Function grads_read() returns a 2D or 3D array at a record: x = grads_read(f,f@varnames(0),0) Function grads_time() returns an array of increments from the initial time with units as attributes *Limitations Parsing is not perfect so there are a numbers of limitations in particular: -Byte reversing is not supported. -mixed case such as Xdef, xDef are not supported (xdef, XDEF are OK)