Hello Daniele,
Thanks for the reply, not an expert on this but I will answer to the
best of my abilities.
The netCDF files are an output of a fire smoke dispersion model called
bluesky <http://www.airfire.org/bluesky/> in which are initialized by
.ARL files from National Weather Service containing met info of our domain.
The .ARL file's coordinate system is Polar stereographic projection
which seems to be related to the M3IO convention. As well, the M3IO api
<https://www.unidata.ucar.edu/software/thredds/v4.3/netcdf-java/v4.2/javadoc/ucar/nc2/dataset/conv/M3IOConvention.html>mentions
this convention is a standard for air quality models (EPA), perhaps this
is related to the dispersion model I am using.
As well, in a vain attempt to make the netCDF convention fit into
COARDS, the .nc file named 'dispersion2' has it's dimension names
editted. Dispersion_original.nc
<https://www.dropbox.com/sh/m5gebm21z73ng1y/AADky3C3q2mga0WqsyJ57Pbka?dl=0>
is the untainted output file from the bluesky framework.
Regards,
Matt
On 2016-01-18 6:17 AM, Daniele Romagnoli-3 [via OSGeo.org] wrote:
> Hi Matt, I was able to check your sample. It seems like a problem on > your
> dataset OR on the underlying UCAR NetCDF java lib. Let me try
to > explain that in order to figure out the real issue. > > When
GeoTools/GeoServer accesses a NetCDF file, it delegates the UCAR >
NetCDF lib (currently, 4.6.0 version) to open a NetCDF dataset. Due > to
the wide amount of conventions, types, structures existing in the >
NetCDF world, the UCAR lib tries to individuate the convention used > by
the specific sample, by parsing some attributes, datatypes or >
elements. > > For your case, the lib thinks that your data is part of
the > M3IOConvention. >
https://github.com/Unidata/thredds/blob/master/cdm/src/main/java/ucar/nc2/dataset/conv/M3IOConvention.java#L72
> > >
since during the preliminar scan it finds the set of attributes required
by that convention.
> > // global attributes: :NCOLS = 921; // int :NROWS = 301; // int >
:XORIG = -144.5; // double :YORIG = 40.0; // double :XCELL = >
0.10000000149011612; // double :YCELL = 0.10000000149011612; // > double
> > Afterwards, it tries to setup the coordinates based on that >
convention: >
https://github.com/Unidata/thredds/blob/master/cdm/src/main/java/ucar/nc2/dataset/conv/M3IOConvention.java#L98
> > >
And here is where it throws a NPE exception since the expected field
doesn't actually exists.
> > At this point, I have a set of questions for you. How did you create
> this file? Can you share some more information about that? Is it >
somehow related with the M3IOConvention? I'm asking this so you can >
fix your sample data in case it isn't well formed OR we can keep in >
touch with the UCAR team to improve their library to support this >
sample in case it is a properly formed dataset. > > Please, let me know.
Best Regards, Daniele > > > > On Fri, Jan 8, 2016 at 5:40 PM, brownbagel
<[hidden email] > </user/SendEmail.jtp?type=node&node=5245897&i=0>>
wrote: > > Hello, > > After browsing around this forum, seems like this
is a common issue, > but I still do not seem to find a solution. > > I
am attempting to upload NetCDF files onto geoserver via netCDF >
extension. Using sample .nc from the web, this extension works. >
However, when I attempt to upload my own files, I encounter the error >
"Could not find layer". > > I understand that geoserver requires
CF/COARDS convention, I have > attempted to rename my dimensions to be
in accordance to this. Are > there still other aspects of the .nc that I
have to alter? Are there > alternative methods (ie, converting to other
file formats?) I've > tried converting to geoTiff and .shp via GDAL but
have no success in > that. > > Attached: my .nc file (dispersion2.nc
<http://dispersion2.nc>), > geoserver log >
https://www.dropbox.com/sh/m5gebm21z73ng1y/AADky3C3q2mga0WqsyJ57Pbka?dl=0 >
> >
Thanks & Bless,
> Matt > > > > > -- View this message in context: >
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