Okay, thanks for the info Daniele,
I do have the content as a list of hourly pngs, perhaps I can
geo-reference them then add them as an ImageMosaic.
Regards,
Matt
On 2016-01-22 6:46 AM, Daniele Romagnoli wrote:
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 <mailto: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>
<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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> >
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