[gradsusr] Accessing data chunks via GrADS data server

[Marsh, Kieren [FGUAE]]

Can someone please explain to me how the bracketed notation works to extract data from a GDS. By this I mean the following:



http://metserver:9090/dods/neww3/neww3.00z.ascii?htsgwsfc[0:20][0:40][110][72]



which extracts htsgwsfc over ensemble members 1-21 (0-20 when zero based), time values 0-40 at x=110 and y=72 and gives an ascii text file I can grab using something like wget.



Am I able to use this kind of notation in GrADS scripts to access a chunk of data that I can define to a variable?



e.g.



'define myvar = <http://metserver:9090/dods/neww3/neww3.00z.ascii?htsgwsfc[0:20][0:40][110][72> http://metserver:9090/dods/neww3/neww3.00z.?htsgwsfc[0:20][0:40][110][72<http://metserver:9090/dods/neww3/neww3.00z.?htsgwsfc[0:20][0:40][110][72]'>]'



All combinations I try don't work and I can't find any documentation on it.



I have looked at the documentation for access using the curly bracket notation, e.g.:

http://metserver:9090/dods/_expr_{neww3/neww3.t00z}{htsgwsfc}{73:73,111:111,1:1,00Z20MAY2014:00Z25MAY2014}



...but I don't seem to be able to capture the ensemble dimension using this format.



Any help will be greatly appreciated.


Kieren
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