Reduced gaussian grid -> matchmaking in grads

[Davide Sacchetti]

pdef is well documented (see grads web site)
but producing a good pdef it is not a really easy task ...
the best way is to use facilities from latest grib2ctl.pl: it doesn't
work for everything but it manages correctly reduced gaussian grid, as I
learned from Wesley Ebisuzaki (I'd like to thank Wesley for this useful
work!).
p.s. that after after grib2ctl.pl you may need to apply minimal changes
to ctl file.

Bye bye
Davide


On Fri, 2007-03-02 at 10:39 +0000, bernd.becker at METOFFICE.GOV.UK wrote:
> Hi,
>
> Thanks for help received so far!
> Much appreciated!
>
> What information goes into a pdef file?
>
> pdef 843490 1 file 1 stream binary ^cp_gg_reduced.grib.pdef
>
> This is my grid definition:
>
> Section 2 - Grid Description Section.
>  -------------------------------------
>  (Southern latitudes and Western longiwantedtudes are negative.)
>  Data represent type = gaussian     (Table 6)         4
>   Number of points along a parallel varies.
>   Number of points.   Parallel. (North to South)
>     18                   1
>     25                   2
>     36                   3
>     40                   4
>     45                   5
>     54                   6
>     60                   7
>     64                   8
>     72                   9 to   10
>     80                  11
>     90                  12
>     96                  13
>    100                  14
>    108                  15
>    120                  16 to   17
>    128                  18
>    135                  19
>    144                  20 to   21
>    150                  22
>    160                  23 to   24
>    180                  25 to   27
>    192                  28 to   29
>    200                  30 to   31
>    216                  32 to   34
>    225                  35 to   36
>    240                  37 to   39
>    256                  40 to   43
>    288                  44 to   52
>    300                  53 to   56
>    320                  57 to  104
>    300                 105 to  108
>    288                 109 to  117
>    256                 118 to  121
>    240                 122 to  124
>    225                 125 to  126
>    216                 127 to  129
>    200                 130 to  131
>    192                 132 to  133
>    180                 134 to  136
>    160                 137 to  138
>    150                 139
>    144                 140 to  141
>    135                 142
>    128                 143
>    120                 144 to  145
>    108                 146
>    100                 147
>     96                 148
>     90                 149
>     80                 150
>     72                 151 to  152
>     64                 153
>     60                 154
>     54                 155
>     45                 156
>     40                 157
>     36                 158
>     25                 159
>     18                 160
>  Number of points along a meridian.                 160
>  Latitude of first grid point.                    89141
>  Longitude of first grid point.                       0
>  Resolution and components flag.               00000000
>  Latitude of last grid point.                    -89141
>  Longitude of last grid point.                   358875
>  i direction (East-West) increment            Not given
>  Number of parallels between pole and equator.       80
>  Scanning mode flags (Code Table 8)            00000000
>  Number of vertical coordinate parameters.            0
>
>
> what would the ctl grid definition look alike?
>
>
> My data  is still grib encoded.
> Is there any hope, that gribmap will eventually build a
> idx file to match my grib data?
>
> Many thanks!
>
> Bernd
> --
> Bernd Becker   The Monthly Outlook
> Met Office  FitzRoy Road  Exeter   Devon EX1 3PB  United Kingdom
> Tel.: +44 (0) 1392 884511 Fax: +44 (0)870 900 5050
> E-mail:bernd.becker at metoffice.gov.uk -  http://www.metoffice.gov.uk
>
--
Sacchetti Davide
ARPAL UO3 Centro Meteo Idrologico Regione Liguria - Dir. Scientifica
V.le Brigare Partigiane 2 16121 Genova (I)
tel: +39 010 6437535
mail: davide.sacchetti at arpal.org   web: www.meteoliguria.it