[Qgis-user] Intersecting NetCDF file attributes with vector layers

[Etienne Tourigny]

On Mon, Apr 14, 2014 at 3:31 PM, Steve Friedman <skfglades at gmail.com> wrote:

> Yes I know that netcdf files store arrays of data and that each us treated
> as a subset of the main file.
>
> This is  not a case for raster calculator. NIR is it a case requiring a
> hydrological plugin.
>
> In ArcGis, which is no longer available to me, I used a built in tool to
> overlay the raster vegetation map with the netcdf shape file representing
> the hydrological metric of interest.
>

netcdf shape file? Never heard of such a thing - QGIS and GDAL only support
netcdf *raster* files.

cheers
Etienne


>  Perhaps extracting each metric to its own file will yield a reasonable
> method.
>
> Thanks
>
> On Apr 14, 2014 1:57 PM, "Etienne Tourigny" <etourigny.dev at gmail.com>
> wrote:
> >
> > You should use the raster calculator to do any calculations on rasters,
> or some of the tools in processing. But your use case seems a bit
> complicated - perhaps there is a hydrological plugin or processing
> algorithm that can help.
> >
> > Have you tried loading the file in QGIS?
> >
> > But be aware that netcdf files with many variables are a bit tricky -
> each variable is a subdataset, which is treated as a separate file. See the
> gdal netcdf page for more details [1].
> >
> > You could translate them to individual files in another format like
> gtiff using gdal:
> >
> > gdal_translate -of gtiff -sds in.nc out
> >
> >
> > [1] http://www.gdal.org/frmt_netcdf.html
> >
> >
> >
> > On Mon, Apr 14, 2014 at 1:28 PM, Steve Friedman <skfglades at gmail.com>
> wrote:
> >>
> >> No.  The Netcdf file has 20+ variables. It is a spatially explicit data
> for hydrological metrics in a large wetland.  I want to associate these
> variables with a vegetation map of the same area.  Then I will conduct a
> GLM multinomial statistical analysis to derive probabilities of vegetation
> community based on the spatial distribution of the hydrologic metrics.
> >>
> >> Hope that make the problem clearer.  If not let me know and I'll try to
> make it more explicit.
> >>
> >> Thanks
> >> Steve
> >>
> >> On Apr 14, 2014 10:58 AM, "Etienne Tourigny" <etourigny.dev at gmail.com>
> wrote:
> >>>
> >>> I don't understand what you mean. You have a netcdf file with 1
> variable that has 20+ attributes, and you want to copy them to another
> raster as metadata? What is the format of your raster?
> >>>
> >>>
> >>> On Mon, Apr 14, 2014 at 9:07 AM, Steve Friedman <skfglades at gmail.com>
> wrote:
> >>>>
> >>>> Hello
> >>>>
> >>>> I have a netcdf file with 20+ attributes that I need to link to a
> raster layer.
> >>>>
> >>>> I do not see a method for this.  I am hoping that I have just missed
> something obvious.
> >>>>
> >>>> Can someone point me in the right direction.
> >>>>
> >>>> Thank you
> >>>> Steve
> >>>>
> >>>> _______________________________________________
> >>>> Qgis-user mailing list
> >>>> Qgis-user at lists.osgeo.org
> >>>> http://lists.osgeo.org/mailman/listinfo/qgis-user
> >>>
> >>>
> >
>
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