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

[Steve Friedman]

My mistake.  The shape file is the raster vegetation map and the netcdf
file contains the hydrological metrics.
Sorry for the confusion.

Thank you for the help.
Steve
On Apr 14, 2014 4:34 PM, "Etienne Tourigny" <etourigny.dev at gmail.com> wrote:

>
>
>
> 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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