Re: how can I use actual-range???

Hi, marziyeh

I met this problem before. Dennis has answered it in detail. I would like to forward the email below. Good luck!


Shawn




Wen.J.Qu
2012-11-12



·¢¼þÈË£º marziyeh dadizadeh
·¢ËÍʱ¼ä£º 2012-11-12 21:28:53
ÊÕ¼þÈË£º NCL
³­ËÍ£º
Ö÷Ì⣺ [ncl-talk] how can I use actual-range???

Dear NCL Users,


I want to make a plot of NCEP data.



In all header parameter, there are 2 different attributions, "actual_range" and "valid_range".

When I use Grads software to plot my data, it seems "actual_range" are in use, that it is true. But when the same data are in NCL and I make a plot, I see "valid_range" in graphics output, that it is not true!


There is a sample plot in attach. I got it by NCL, Please see it.
In both of them, Grads and NCL, I used simple script without any special order but results were different.



How can I plot actual-rang in NCL just like Grads??
Can anyone help me please??


Thank you very much,
Marzie







---------------------------------------------------------------------------

This is header of my file:
---------------------------------------------------------------------------



filename: temp-lev850-Apr-1to31
path: temp-lev850-Apr-1to31.nc
   file global attributes:
      Conventions : COARDS
      title : 4x daily NMC reanalysis (2005)
      history : Wed Nov 7 13:13:51 2012: ncks -O -d level,850.000000 -d lat,-90.000000,90.000000 -d lon,0.000000,357.500000 -d time,90,120 /Datasets/ncep.reanalysis.dailyavgs/pressure/air.2005.nc /Public/www/X94.183.222.27.311.13.13.50.nc
created 2005/01/03 by Hoop (netCDF2.3)
      description : Data is from NMC initialized reanalysis
(4x/day). It consists of most variables interpolated to
pressure surfaces from model (sigma) surfaces.
      platform : Model
      references : http://www.esrl.noaa.gov/psd/data/gridded/data.ncep.reanalysis.html
   dimensions:
      time = 31 // unlimited
      level = 1
      lat = 73
      lon = 144
   variables:
      short air ( time, level, lat, lon )
         long_name : mean Daily Air temperature
         unpacked_valid_range : ( 150, 350 )
         actual_range : ( 214.88, 305.37 )
         units : degK
         add_offset : 477.66
         scale_factor : 0.01
         missing_value : 32766
         precision : 2
         least_significant_digit : 1
         GRIB_id : 11
         GRIB_name : TMP
         var_desc : Air temperature
         dataset : NCEP Reanalysis Daily Averages
         level_desc : Multiple levels
         statistic : Mean
         parent_stat : Individual Obs
         valid_range : ( -32766, -12766 )
         _FillValue : 32766

      float lat ( lat )
         units : degrees_north
         actual_range : ( 90, -90 )
         long_name : Latitude
         standard_name : latitude
         axis : Y

      float level ( level )
         units : millibar
         actual_range : ( 850, 850 )
         long_name : Level
         positive : down
         GRIB_id : 100
         GRIB_name : hPa
         axis : Z

      float lon ( lon )
         units : degrees_east
         long_name : Longitude
         actual_range : ( 0, 357.5 )
         standard_name : longitude
         axis : X

      double time ( time )
         units : hours since 1-1-1 00:00:0.0
         long_name : Time
         actual_range : ( 17568912, 17569632 )
         delta_t : 0000-00-01 00:00:00
         avg_period : 0000-00-01 00:00:00
         standard_name : time
         axis : T

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Received on Mon Nov 12 22:34:08 2012