Hi Matt,
I have checked the second NetCDF file you provided.
Although this one will be properly opened by the UCAR lib (note: this is
the low-level one), GeoServer and GeoTools won't be available to open that
(these high level libs can only deal with CF datasets), due to the lack of
proper dimensions and properly specified Coordinates.
See these sections of the convention for further details:
http://cfconventions.org/cf-conventions/v1.6.0/cf-conventions.html#grid-mappings-and-projections
http://cfconventions.org/cf-conventions/v1.6.0/cf-conventions.html#appendix-grid-mappings
As well as the main GeoServer NetCDF documentation pages.
http://docs.geoserver.org/latest/en/user/extensions/netcdf/netcdf.html#notes-on-supported-netcdfs
http://docs.geoserver.org/latest/en/user/extensions/netcdf/netcdf.html#supporting-custom-netcdf-coordinate-reference-systems
Hope this helps.
Cheers,
Daniele
On Mon, Jan 18, 2016 at 5:24 PM, Matthew Fung <fungyuensang...@hotmail.com>
wrote:
> 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> <http://dispersion2.nc>), >
> geoserver log >
> https://www.dropbox.com/sh/m5gebm21z73ng1y/AADky3C3q2mga0WqsyJ57Pbka?dl=0
> > > >
> Thanks & Bless,
> > Matt > > > > > -- View this message in context: >
> http://osgeo-org.1560.x6.nabble.com/Geoserver-Store-NetCDF-issue-Could-not-find-layers-tp5244318.html
> > >
> Sent from the GeoServer - User mailing list archive at Nabble.com.
> > >
> ------------------------------------------------------------------------------
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--
==
GeoServer Professional Services from the experts! Visit
http://goo.gl/it488V for more information.
==
Ing. Daniele Romagnoli
Senior Software Engineer
GeoSolutions S.A.S.
Via Poggio alle Viti 1187
55054 Massarosa (LU)
Italy
phone: +39 0584 962313
fax: +39 0584 1660272
http://www.geo-solutions.it
http://twitter.com/geosolutions_it
-------------------------------------------------------
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Le informazioni contenute in questo messaggio di posta elettronica e/o
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loro utilizzo è consentito esclusivamente al destinatario del messaggio,
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