====== ESGF related notes ======

===== Extracting a region from a variable =====

Requirements:
  * data available on disk (possibly split along the time axis), e.g. on the ''ciclad'' server
  * ''nco'' installed (''ncks'', ''ncrcat'')
  * ''tcsh'' shell, in order to use ''foreach''

<code> $ cd /prodigfs/esgf/mirror/CMIP5/output1/IPSL/IPSL-CM5A-LR/past1000/mon/atmos/Amon/r1i1p1/v20120804/

 $ ls -lh pr/pr_*.nc
  85M Aug  2  2012 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_085001-104912.nc
  85M Aug  2  2012 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_105001-124912.nc
  85M Aug  2  2012 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_125001-144912.nc
  85M Aug  2  2012 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_145001-164912.nc
  85M Aug  2  2012 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_165001-184912.nc
 446K Aug  2  2012 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_185001-185012.nc

 $ mkdir -p /data/jypmce/Scratch/EasterIsland/Tmp/pr

 $ foreach f ( pr/pr_*.nc )
  foreach? echo $f
  foreach? ncks -dlat,-35.,-20. -dlon,242.,258. $f /data/jypmce/Scratch/EasterIsland/Tmp/$f:r-Z02.nc
  foreach? end
    pr/pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_085001-104912.nc
    pr/pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_105001-124912.nc
    pr/pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_125001-144912.nc
    pr/pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_145001-164912.nc
    pr/pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_165001-184912.nc
    pr/pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_185001-185012.nc

 $ cd /data/jypmce/Scratch/EasterIsland/Tmp/pr

 $ ls -lh pr_*Z02.nc
 328K Sep  9 11:25 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_085001-104912-Z02.nc
 328K Sep  9 11:25 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_105001-124912-Z02.nc
 328K Sep  9 11:25 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_125001-144912-Z02.nc
 328K Sep  9 11:25 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_145001-164912-Z02.nc
 328K Sep  9 11:25 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_165001-184912-Z02.nc
  11K Sep  9 11:25 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_185001-185012-Z02.nc

 $ ncrcat pr_*Z02.nc pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_085001-184912-Z02.nc

 $ ll -h pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_085001-184912-Z02.nc
 1.6M Sep  9 11:46 pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_085001-184912-Z02.nc

 $ ncdump -vlat,lon pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_085001-184912-Z02.nc
netcdf pr_Amon_IPSL-CM5A-LR_past1000_r1i1p1_085001-184912-Z02 {
dimensions:
	lat = 7 ;
	bnds = 2 ;
	lon = 4 ;
	time = UNLIMITED ; // (12012 currently)
[...]
data:

 lat = -33.1578941345215, -31.2631587982178, -29.3684215545654, 
    -27.4736843109131, -25.5789470672607, -23.6842098236084, -21.7894744873047 ;

 lon = 243.75, 247.5, 251.25, 255 ;
}
</code>


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