[gdal-dev] netCDF to Shapefile

[Michael Sumner]

Hi Manuel, I think you will still need to be more specific. You've
indicated that the data is points, but not what the variables in the
file are, which variables need to be interrogated for coordinates vs.
values, what their dimensions are, whether you want several
shapefiles, or just one with (say) multiple attributes, etc.

There are a number of ways to convert such data to shapefile, but it
might be best to choose a reasonably easy scripting language to do it,
such as Python or R - and so there are probably better forums than
this for your problem.

Either way you'll need to provide a lot more detail - it's likely to
be a two step process, with converting the NetCDF grids to tables (in
memory or file), and then those to point shapefiles.

Cheers, Mike.

On Wed, Mar 16, 2011 at 3:17 PM, Manuel Rainer <manuelrainer at hotmail.com> wrote:
> Thanks for your help,
> it has to be a Shapefile because we do some further processing (symbology,
> map creation...).
> The netCDF file contains hydrodynamics point data.
>
> Best regards
> Manuel
>
> ________________________________
> Date: Wed, 16 Mar 2011 09:32:16 +0530
> Subject: Re: [gdal-dev] netCDF to Shapefile
> From: chaitanya.ch at gmail.com
> To: manuelrainer at hotmail.com
> CC: gdal-dev at lists.osgeo.org
>
> Manuel,
>
> Shapefile is for vector formats alone. Try a raster format to convert the
> netCDF data.
>
> As for the performance, you don't need to cache anything. But it may help to
> tweak the GDAL_CACHEMAX setting.
> http://trac.osgeo.org/gdal/wiki/FAQRaster#Howtoimprovegdalwarpperfomance
>
> On Wed, Mar 16, 2011 at 8:21 AM, Manuel Rainer <manuelrainer at hotmail.com>
> wrote:
>
> Hi,
>
> I would like to convert certain time slices (records) out of a netCDF file
> to a Shapefile.
> The netCDF file has 7> GB, so what is the best proceed to get an appropriate
> performance?
> I mean, should the data be cached (e.g. in an ASCII file, ...)
> before writing a Shapefile or can the shp directly be generated?
> Perhaps you have some experiences...
>
> Thanks for your help!
> Best regards
> Manuel
>
>
>
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>
> --
> Best regards,
> Chaitanya kumar CH.
> /tʃaɪθənjə/ /kʊmɑr/
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-- 
Michael Sumner
Institute for Marine and Antarctic Studies, University of Tasmania
Hobart, Australia
e-mail: mdsumner at gmail.com