[netCDF #HMG-489739]: _Fillvalue value declaration nf90

Zane,

> It is a fortran 90 program. I am trying to read a netCDF file so I that can 
> manipulate the data from it and write it back to the netCDF file. Everything 
> goes fine until the point where I try to read the _Fillvalue ( _Fillvalue = 
> -32767s), missing values (missing_value = -32767s) and  rainfall offset 
> (add_offset = 650.f). The problem is that I have trouble reading in the value 
> since there are characters and integers mixed. I can only read it in as a 
> character, but then when writing these back to the netCDF file it puts the 
> value in "..." (eg "-32767s"). So how can I read and write these attribute 
> values?
> 
> This is what I want: (what I can get but that doesnt work)
> 
> short rnd24(time, lat, lon) ;
> rnd24:long_name = "24hr precipitation" ;
> rnd24:units = "mm" ;
> rnd24:add_offset = 650.f ; (rnd24:add_offset = "650.f")
> rnd24:scale_factor = 0.0203125f ; (rnd24:scale_factor = "0.0203125f" )
> rnd24:valid_min = -32500 ;
> rnd24:valid_max = 32500 ;
> rnd24:cell_methods = "time: mean" ;
> rnd24:_FillValue = -32767s ; (rnd24:_FillValue = "-32767s")
> rnd24:missing_value = -32767s ; (rnd24:missing_value = "-32767s")
> 
> 
> Here is an example where I tried writing a netCDF file: (I have highlighted 
> the areas where I am struggling to define the attributes)

OK, I've marked the changes you need below.  You just have to declare the
attribute values to be the type intended ...

--Russ

> PROGRAM test
> use netcdf
> implicit none
> 
> character (len = *), parameter :: FN="1979RR.nc", FN2="ccam_data.nc"
> character (len = *), parameter :: LAT="lat", Y_AXIS="Y", LAT_LONG="latitude"
> character (len = *), parameter :: LON="lon", X_AXIS="X", LON_LONG="longitude"
> character (len = *), parameter :: TIM="time", TIM_NAME="****", T_AXIS="T"
> character (len = *), parameter :: L_NAME="long_name", S_NAME="standard_name"
> character (len = *), parameter :: RR="rnd24", RR_LONG="24h precipitation"
> character (len = *), parameter :: OFF_NAME="add_offset", 
> SF_NAME="scale_factor", VMN_NAME="valid_min", VMX_NAME="valid_max"
> character (len = *), parameter :: FV_NAME="_FillValue", 
> MV_NAME="missing_value"
> character (len = *), parameter :: GS_NAME="source", SOURCE="CSIRO....."
> character (len = *), parameter :: GA_il="il", GA_kl="kl", GA_lon="rlong0", 
> GA_lat="rlat0", GA_shm="schmidt"
> character (len = *), parameter :: GA_lon_val="0.f", 
> GA_lat_val="0.f",GA_shm_val="1.f"
> 
> !*** THESE strings should be VALUES (conversion needed)
> character (len = *), parameter :: RR_OFFSET="650.f", SF="0.0203125f"
> character (len = *), parameter :: MV="-32767s"  , FV="-32767s"

real, parameter :: RR_OFFSET=650.0, SF=0.0203125
integer*2, parameter :: MV=-32767  , FV=-32767

> character (len = *), parameter :: UNITS="units", AXIS="axis"
> character (len = *), parameter :: LAT_UNITS="degrees_north"
> character (len = *), parameter :: LON_UNITS="degrees_east"
> character (len = *), parameter :: RR_UNITS="mm"
> 
> integer, parameter :: NLATS=31, NLONS=51
> integer, parameter :: NDIMS=3, NTIM=1, VMN=-32500, VMX=32500
> integer, parameter :: GA_il_val=48, GA_kl_val=18
> integer, parameter :: lon_START=-20, lon_END=80, lat_START=-50, lat_END=10
> integer, parameter :: tim_START=1440, tim_END=43200
> 
> !real, dimension(:,:,:), allocatable :: RR24
> real :: RR24(NLONS,NLATS)
> integer :: ncid, ncid2, lat_dimid, lat_varid, latc
> integer :: lon_dimid, lon_varid, lonc
> integer :: tim_dimid, tim_varid, timc
> integer :: rr_varid, rr2_varid, i
> integer :: dimids(NDIMS), start(NDIMS), count(NDIMS)
> 
> !real , parameter :: FV = '-32323s'
> 
> real :: lats(NLATS), lons(NLONS), tims(NTIM)
> 
> open(1,file='1979_RRTOT.txt')
> 
> 
> do latc = 1, NLATS
> lats(latc)= lat_START + (latc - 1)*2
> end do
> 
> do lonc = 1, NLONS
> lons(lonc)= lon_START + (lonc - 1)*2
> end do
> 
> do timc = 1, NTIM
> tims(timc)= tim_START + (timc - 1)*1440
> end do
> 
> 
> do latc = 1, NLATS
> read(1,*) (RR24(lonc,latc),lonc=1,51)
> do lonc = 1, NLONS
> RR24(lonc,latc)=RR24(lonc,latc)/12
> end do
> end do
> 
> !create netCDF file
> call check(nf90_create(FN, NF90_CLOBBER, ncid))
> call check(nf90_open(FN2, NF90_NOWRITE, ncid2))
> 
> !define dimentions
> call check(nf90_def_dim(ncid, LON, NLONS, lon_dimid))
> call check(nf90_def_dim(ncid, LAT, NLATS, lat_dimid))
> call check(nf90_def_dim(ncid, TIM, NF90_UNLIMITED, tim_dimid))
> 
> !define variables
> dimids = (/ lon_dimid, lat_dimid, tim_dimid /)
> call check(nf90_def_var(ncid, LON, NF90_REAL, lon_dimid, lon_varid))
> call check(nf90_def_var(ncid, LAT, NF90_REAL, lat_dimid, lat_varid))
> call check(nf90_def_var(ncid, TIM, NF90_REAL, tim_dimid, tim_varid))
> call check(nf90_def_var(ncid, RR, NF90_SHORT, dimids, rr_varid))
> 
> !add attributes of the variables
> call check(nf90_put_att(ncid, lon_varid, L_NAME, LON_LONG))
> call check(nf90_put_att(ncid, lon_varid, S_NAME, LON_LONG))
> call check(nf90_put_att(ncid, lon_varid, AXIS, X_AXIS))
> call check(nf90_put_att(ncid, lon_varid, UNITS, LON_UNITS))
> 
> call check(nf90_put_att(ncid, lat_varid, L_NAME, LAT_LONG))
> call check(nf90_put_att(ncid, lat_varid, S_NAME, LAT_LONG))
> call check(nf90_put_att(ncid, lat_varid, AXIS, Y_AXIS))
> call check(nf90_put_att(ncid, lat_varid, UNITS, LAT_UNITS))
> 
> 
> 
> call check(nf90_put_att(ncid, tim_varid, UNITS, TIM_NAME))
> call check(nf90_put_att(ncid, tim_varid, S_NAME, TIM))
> call check(nf90_put_att(ncid, tim_varid, AXIS, T_AXIS))
> 
> call check(nf90_put_att(ncid, rr_varid, L_NAME, RR_LONG))
> call check(nf90_put_att(ncid, rr_varid, UNITS, RR_UNITS))
> 
> !call check(nf90_put_att(ncid, rr_varid, OFF_NAME, RR_OFFSET))
> !call check(nf90_put_att(ncid, rr_varid, SF_NAME, SF))
> !call check(nf90_put_att(ncid, rr_varid, VMN_NAME, VMN))
> !call check(nf90_put_att(ncid, rr_varid, VMX_NAME, VMX))
> call check(nf90_put_att(ncid, rr_varid, FV_NAME, FV))
> !call check(nf90_put_att(ncid, rr_varid, MV_NAME, MV))

call check(nf90_put_att(ncid, rr_varid, OFF_NAME, RR_OFFSET))   
call check(nf90_put_att(ncid, rr_varid, SF_NAME, SF)) 
call check(nf90_put_att(ncid, rr_varid, VMN_NAME, VMN)) 
call check(nf90_put_att(ncid, rr_varid, VMX_NAME, VMX)) 
call check(nf90_put_att(ncid, rr_varid, FV_NAME, FV)) 
call check(nf90_put_att(ncid, rr_varid, MV_NAME, MV)) 

> !***Global Attributes
> call check(nf90_put_att(ncid, NF90_GLOBAL, GS_NAME, SOURCE))
> call check(nf90_put_att(ncid, NF90_GLOBAL, GA_il, GA_il_val))
> call check(nf90_put_att(ncid, NF90_GLOBAL, GA_kl, GA_kl_val))
> call check(nf90_put_att(ncid, NF90_GLOBAL, GA_lon, GA_lon_val))
> call check(nf90_put_att(ncid, NF90_GLOBAL, GA_lat, GA_lat_val))
> call check(nf90_put_att(ncid, NF90_GLOBAL, GA_shm, GA_shm_val))
> 
> !end def
> call check(nf90_enddef(ncid))
> 
> !add values to attributes
> call check(nf90_put_var(ncid, lon_varid, lons))
> call check(nf90_put_var(ncid, lat_varid, lats))
> call check(nf90_put_var(ncid, tim_varid, tims))
> 
> ..............
> 
> Regards,
> Zane
> 
> 
> 
> 
> 
> 
> 
> 
> 
> >>> "Unidata netCDF Support" <address@hidden> 10/30/2012 12:08 AM >>>
> Hi Zane,
> 
> > I am trying to copy an attribute, Fillvalue, but I get errors or
> > segmantation fault in the declaration of a fillvalue that is the following
> > value for eg. -11111s. The same goes for offset values for eg 650.f or
> > 0.34344f. How do I declare these?
> 
> Sorry, we need more information.
> 
> Are you trying to define the _FillValue attribute in a C program, a Fortran
> program, or a CDL file?
> 
> Do you have a small example that demonstrates the problem, so we can reproduce
> it here and determine what is going on?
> 
> Or do you just need a small example in C or Fortran to show how to define
> variable attributes?
> 
> --Russ
> 
> Russ Rew                                         UCAR Unidata Program
> address@hidden                      http://www.unidata.ucar.edu
> 
> 
> 
> Ticket Details
> ===================
> Ticket ID: HMG-489739
> Department: Support netCDF
> Priority: Normal
> Status: Closed
> 
> 
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> 
> --
> This message is subject to the CSIR's copyright terms and conditions, e-mail 
> legal notice, and implemented Open Document Format (ODF) standard.
> The full disclaimer details can be found at 
> http://www.csir.co.za/disclaimer.html.
> 
> This message has been scanned for viruses and dangerous content by 
> MailScanner,
> and is believed to be clean.
> 
> Please consider the environment before printing this email.
> 
> 
> 

Russ Rew                                         UCAR Unidata Program
address@hidden                      http://www.unidata.ucar.edu



Ticket Details
===================
Ticket ID: HMG-489739
Department: Support netCDF
Priority: Normal
Status: Closed