[gradsusr] geotiff files

[Andres Lighezzolo]

Thanks a lot Mike, i'm going to try soon.
Then i'll tell you later.
Andrés


2016-01-29 11:06 GMT-03:00 Michael Mase <masester at gmail.com>:

> Sure, here is some documentation also:
>
> www.cpc.ncep.noaa.gov/products/wesley/wgrib2/new_grid.html
>
> Installing wgrib2 can be kind of a pain because you need fortran and gcc
> pointed correctly, but once you get it set up, it's extremely useful. GrADS
> might come with it, I'm not sure though.
>
> My quick steps are:
>
> -know the resolution of the product that you are working with
> -know your starting and ending lat/lon
>
> In the below example, I'm starting at a longitude of -145 and creating 760
> points at a resolution of 0.125 degrees. Same goes for latitude, starting
> at 15 degrees and going up 320 points at an interval of 0.125 degrees. This
> will output a grib that is a lat/lon grid of 760x320 at a resolution of
> 0.125 degrees. This can also be used to interpolate the data to a finer
> resolution if you prefer, but since you are using GrADS, I recommend simply
> maintaining the original resolution and let GrADS handle the interpolation.
>
> * wgrib2 input.grib2 -set_grib_type same -new_grid latlon -145.0:760:0.125
> 15.0:320:0.125 output.grib2*
>
> Let me know if you have any questions.
>
> Mike
>
>
>
>
> On Fri, Jan 29, 2016 at 8:54 AM Andres Lighezzolo <
> andreslighezzolo at gmail.com> wrote:
>
>> Thanks Michael!, can you show me how you do it?
>>
>>
>> 2016-01-28 11:59 GMT-03:00 Michael Mase <masester at gmail.com>:
>>
>>> Hm, that's a good question. I usually convert from a gaussian grid to a
>>> lat lon grid with wgrib2, which seems to work very well.
>>>
>>> On Thu, Jan 28, 2016 at 9:57 AM Andres Lighezzolo <
>>> andreslighezzolo at gmail.com> wrote:
>>>
>>>> Dear GRADS users,
>>>>
>>>> I usualy work with grb2 files from GFS model and using these in a
>>>> geographical information system. I open and then transform the grb2 files
>>>> in geotiff files with the sentence 'set gxout geotiff'. No problems with
>>>> that, the file geottif is generated correctly.
>>>>
>>>> But now i'm working with CFSv2 files. When a try to transform these
>>>> files to geotiff with the 'set gxout geotiff', the file is created but is
>>>> not georeferenced.
>>>>
>>>> GFS files are in lat-lon grid:(1440 x 721)  defined as:
>>>>
>>>> ydef 721 linear -90.000000 0.25
>>>>
>>>> xdef 1440 linear 180.000000 0.250000
>>>>
>>>>
>>>> and CFSv2 files are Gaussian grid: (384 x 190) defined as:
>>>>
>>>> xdef 384 linear 0.000000 0.9375
>>>>
>>>> ydef 190 levels
>>>>
>>>>  -89.277 -88.340 ........... 87.397  88.340  89.277
>>>>
>>>>
>>>> Can Grads make geotiff with georeference when the ydef is defined by
>>>> levels?
>>>>
>>>>
>>>> Thanks in advance
>>>>
>>>>
>>>> --
>>>> Mgter. Andrés Lighezzolo
>>>> Área/Departamento: Gerencia de Institucionales/Unidad Emergencias
>>>> Nacionales y CAEARTE
>>>> Sede CONAE Córdoba: Centro Espacial Teófilo Tabanera - Falda del Carmen.
>>>> Teléfono 54-3547-400000 interno 1189
>>>> Argentina
>>>> http://meteo.caearte.conae.gov.ar/wrf
>>>> _______________________________________________
>>>> gradsusr mailing list
>>>> gradsusr at gradsusr.org
>>>> http://gradsusr.org/mailman/listinfo/gradsusr
>>>>
>>>
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>>>
>>
>>
>> --
>> Mgter. Andrés Lighezzolo
>> Área/Departamento: Gerencia de Institucionales/Unidad Emergencias
>> Nacionales y CAEARTE
>> Sede CONAE Córdoba: Centro Espacial Teófilo Tabanera - Falda del Carmen.
>> Teléfono 54-3547-400000 interno 1189
>> Argentina
>> http://meteo.caearte.conae.gov.ar/wrf
>> _______________________________________________
>> gradsusr mailing list
>> gradsusr at gradsusr.org
>> http://gradsusr.org/mailman/listinfo/gradsusr
>>
>
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>


-- 
Mgter. Andrés Lighezzolo
Área/Departamento: Gerencia de Institucionales/Unidad Emergencias
Nacionales y CAEARTE
Sede CONAE Córdoba: Centro Espacial Teófilo Tabanera - Falda del Carmen.
Teléfono 54-3547-400000 interno 1189
Argentina
http://meteo.caearte.conae.gov.ar/wrf
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