| NetCDF Attribute Inquiry [message #24243] |
Tue, 20 March 2001 08:56  |
Alex Schuster
Messages: 124
Registered: February 1997
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Senior Member |
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Hi!
I am reading NetCDF files. I do not know for sure which of the
attributes are really stored in the file, so I use NCDF_ATTINQ() to
check before.
With missing attributes, there are two problems:
1) I always get a message like that:
% NCDF_ATTINQ: Attribute inquiry failed, name "somthing" already in use.
This doesn't look good, but I can live with that. No idea why it it
tells me that the name is already being used, because it is not.
2) This one is worse: sometimes the result structure of NCDF_ATTINQ()
does not have a datatype of 'UNKNOWN', but of 'BYTE'. With a random
length. Another NCDF_ATTINQ() gives a different result. Any idea what's
happening here?
My workaround so far is the usage of this function:
function attribute_there, id, varid, name
result = ncdf_attinq( id, varid, name )
if ( result.datatype ne 'UNKNOWN' $
and result.length gt 0 $
and result.length lt 1000 ) then begin
result = ncdf_attinq( id, varid, name )
if ( result.datatype ne 'UNKNOWN' $
and result.length gt 0 $
and result.length lt 1000 ) then begin
return, 1
endif
endif
return, 0
end
I check two times, and I also check for not-too-crazy length fields. I
guess this will work most of the time, but it's not perfect and will
fail some time.
Alex
--
Alex Schuster Wonko@weird.cologne.de PGP Key available
alex@pet.mpin-koeln.mpg.de
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