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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