ReadMe file for gridding a la Mark New 2000
Tim Mitchell, 30.3.04

The main program for gridding is quick_interp_tdm2.pro
This program is based on one of Mark New's called quick_interp.pro

This program takes as inputs the outputs from anomdtb.f90 option 3 -
see ~/code/linux/cruts and the readme file there. The location of 
these files is identifed as pts_prefix. There may be an additional input
required of synthetic data, to augment sparse grids for secondary
variables - see the published literature for the reasoning here. The
synthetic files are in binary format and are identified to the program
through synth_prefix. Both identifiers are only prefixes, not full names,
because the program itself supplies the year-specific file endings.i Use
anomfac and synthfac as appropriate.

Use year1 and year2 to specify the range of years to process.

Use out_prefix to specify the location of the output files.

Use dist to specify the correlation decay distance for the climate
variable being interpolated - necessary information to determine where
to add dummy or synthetic data.

Use gs to specify the grid size - 0.5 for half-degree

Use dumpbin to dump, Mark New style, to unreadable IDL binary files
Use dumpglo to dump, Tim Mitchell style, to .glo files (suite of processing
  software for .glo files under ~/code/linux/goglo)
Don't bother with dumpmon
Use binfac and actfac as appropriate

If creating primary variables, don't bother with synthetics.
If creating secondary variables, create (or find) primary variables, grid
   at 2.5deg resolution, and store as IDL binary files. Then use
     frs_gts_tdm.pro
     rd0_gts_tdm.pro
     vap_gts_anom.pro
   to create synthetic grids for the correct variables. Then use quick_interp_tdm2.pro
   on the secondary variable, with synth_prefix supplied, to create the new grids.
Bear in mind that there is no working synthetic method for cloud, because Mark New
   lost the coefficients file and never found it again (despite searching on tape
   archives at UEA) and never recreated it. This hasn't mattered too much, because
   the synthetic cloud grids had not been discarded for 1901-95, and after 1995
   sunshine data is used instead of cloud data anyway.

To convert the output .glo files into the grim formatted files supplied to users:
1. convert these land+ocean files to land-only files using globulk.f90 option 1
     (globulk.f90 is under ~/code/linux/goglo)
2. convert the land-only files to grim using rawtogrim.f90 (~/code/linux/grim)  
