[gdal-dev] grib driver

[Even Rouault]

On jeudi 28 février 2019 10:55:00 CET Zhan Zhang - NOAA Affiliate wrote:
> May I ask whether gdal grib driver support changing grid in a GRIB2
> message? For instance, given a GRIB2 message, I want to change from polar
> stereographic grid projection to lambert conformal grid projection, and the
> data section need also be changed accordingly, and then output this to a
> new GRIB2 message. I ask MDL degrib group and they tell me degrib can not
> do this. It sound that it is likely gdal grib driver cannot do this either.
> However I am not 100% sure and want to seek some comments here. Thanks!

Degrib itself cannot do this, but raster reprojection is a generic function of 
GDAL, so you can do this with the gdalwarp utility:
https://gdal.org/gdalwarp.html

Something like:

gdalwarp -of GRIB in.grb2 out.grb2 -t_srs "+proj=lcc +lat_1=... +lat_2=... 
+R=....."

You may also consult the GRIB driver documentation for GRIB specific creation 
options:
https://gdal.org/frmt_grib.html

Even

> 
> On Thu, Feb 28, 2019 at 10:27 AM Even Rouault <even.rouault at spatialys.com>
> 
> wrote:
> > On jeudi 28 février 2019 09:29:41 CET Zhan Zhang - NOAA Affiliate wrote:
> > > I am new to the gdal apis and is interested in getting some knowledge of
> > > the grib driver. May I ask whether it basically provides the same
> > > functionality as degrib from MDL/NWS/NOAA? Thanks! --Zhan
> > 
> > The GDAL GRIB driver strongly relies on degrib+g2clib. It esposes their
> > functionality through the general GDAL raster API, so as to be able to
> > manipulate a GRIB dataset as any other GDAL raster.
> > 
> > Even
> > 
> > --
> > Spatialys - Geospatial professional services
> > http://www.spatialys.com


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