Re: Fill values differ- NCARG 5.1 to 5.2

Hi Minna,

This variable is all 0.0 with the different versions that I tried to read it with, so I don't think you're going to have much luck plotting it.

But you're right, in later versions of NCL you start seeing some missing values that weren't there before.

I've created a ticket on this (NCL-993 for your reference). I'm not sure yet if this is a bug in our software, or if there's something wrong with the file. Hopefully Dave Brown will be able to sort this out.

--Mary

On Feb 9, 2011, at 10:05 AM, Minna Win wrote:

> Hello,
>
> I am currently running two versions of NCL: 5.1.0 and 5.2.0. I've
> observed that fill values for specified variables are different between
> these versions. For instance, when performing the following NCL commands:
> ----------------
> ncl 0> f=addfile("201102081942_NCWD2-L.grb","r")
> ncl 1> print(f)
> ncl 2> l=f->LAVNI_GDS3_EATM
> ncl 3> print(l)
>
> The NCL 5.1.0 output looks like:
> ---------------------------------------------------------------
> Variable: l
> Type: float
> Total Size: 6750000 bytes
> 1687500 values
> Number of Dimensions: 2
> Dimensions and sizes: [g3_x_0 | 1125] x [g3_y_1 | 1500]
> Coordinates:
> Number Of Attributes: 14
> sub_center : Aviation Weather Center
> center : US National Weather Service - NCEP (WMC)
> long_name : Low-level aviation interest
> units : non-dim
> _FillValue : 1e+20
> coordinates : g3_lat_0 g3_lon_1
> level_indicator : 200
> gds_grid_type : 3
> parameter_table_version : 129
> parameter_number : 177
> level : 0
> forecast_time : 0
> forecast_time_units : minutes
> initial_time : 02/08/2011 (19:42)
> (0,0) 0
> (0,1) 0
> (0,2) 0
> (0,3) 0
> (0,4) 0
> (0,5) 0
> (0,6) 0
> (0,7) 0
> (0,8) 0
> (0,9) 0
>
> ---------------------------------------------------------------
>
> NCL 5.2.0 output:
> ---------------------------------------------------------------
> Variable: l
> Type: float
> Total Size: 6750000 bytes
> 1687500 values
> Number of Dimensions: 2
> Dimensions and sizes: [g3_x_0 | 1125] x [g3_y_1 | 1500]
> Coordinates:
> Number Of Attributes: 14
> sub_center : Aviation Weather Center
> center : US National Weather Service - NCEP (WMC)
> long_name : Low-level aviation interest
> units : non-dim
> _FillValue : 1e+20
> coordinates : g3_lat_0 g3_lon_1
> level_indicator : 200
> gds_grid_type : 3
> parameter_table_version : 129
> parameter_number : 177
> level : 0
> forecast_time : 0
> forecast_time_units : minutes
> initial_time : 02/08/2011 (19:42)
> (0,0) 1e+20
> (0,1) 1e+20
> (0,2) 1e+20
> (0,3) 1e+20
> (0,4) 1e+20
> (0,5) 1e+20
> (0,6) 1e+20
> (0,7) 1e+20
> (0,8) 1e+20
> (0,9) 1e+20
> ---------------------------------------------------------------
>
>
> The different versions of NCL are running on separate machines with
> similar hardware and versions of Linux:
> 1) Linux strut 2.6.26-2-amd64 #1 SMP Thu Sep 16 15:56:38 UTC 2010 x86_64
> GNU/Linux (this host has NCL 5.1.0)
>
> 2) Linux trim 2.6.26-2-amd64 #1 SMP Thu Nov 25 04:30:55 UTC 2010 x86_64
> GNU/Linux (this host has NCL 5.2.0)
>
> The 1e+20 fill values observed with NCL 5.2.0 are causing some problems
> with our plotting scripts. I've attached the grib file that illustrates
> this behavior. Is there some work-around I can employ?
>
> Thanks in advance for any assistance.
>
> --
> Minna Win
> Software Engineer
> Aviation Digital Data Service (ADDS)
> National Center for Atmospheric Research (NCAR)
> Research Applications Laboratory (RAL)
> 3450 Mitchell Lane
> Boulder, CO 80301
> minnawin@ucar.edu
> +1(303)497-8423
>
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Received on Wed Feb 9 15:22:35 2011