[gdal-dev] Re: how to say gdalwarp to use nadgrid by default

[Chaitanya kumar CH]

Eloi,

You can find the files at gdal/data/pcs.csv and gdal/data/gcs.csv
You may also want to refer to http://www.gdal.org/ogr/osr_tutorial.html

On Sun, Oct 17, 2010 at 5:18 PM, Eloi Ribeiro <eloi.ribeiro at gmail.com>wrote:

> In other words,
>
> When I ask GDAL for:
> *gdalwarp -s_srs EPSG:23030 -t_srs EPSG:4258 rast_23030.tif rast_4258.tif*
>
> GDAL knows that 'EPSG:23030' means '+proj=utm +zone=30 +ellps=intl +units=m
> +no_defs'.
> So my question is: From witch file GDAL gets that information from?
>
> Cheers,
>
> Eloi Ribeiro
> GIS Analyst
> 39,45º -4,40º
> http://eloiribeiro.wordpress.com
>
>
> On Mon, Oct 11, 2010 at 14:55, Eloi Ribeiro <eloi.ribeiro at gmail.com>wrote:
>
>> Hi all,
>>
>> I would like that every time a I use gdalwarp for some EPSG codes [1]
>> transformation it would use by default the nadgrids [2] (for Portugal and
>> Spain) that I have under the folder '/usr/share/proj/'.
>>
>> For that purpose in PostGIS I needed to add
>> '+nadgrids=nadgrid_file_name.gsb' at the end of the line of the 'proj4text'
>> field text in table 'spatial_ref_sys' for each EPSG code I wonted to use the
>> nadgrid.
>>
>> So I suppose there must be a similar way of doing this with GDAL. How can
>> I achieve this with GDAL?
>>
>> Thank's!
>>
>> [1] 27492,27493,20790,20791,23029,23030,23031,3763,4258,4326
>> [2] pt73_e89.gsb, ptLX_e89.gsb, ptLB_e89.gsb, ptED_e89.gsb, R2009V9.gsb,
>> BALR2009.gsb
>>
>>
>> Eloi Ribeiro
>> GIS Analyst
>> 39,45º -4,40º
>> http://eloiribeiro.wordpress.com
>>
>
>
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>



-- 
Best regards,
Chaitanya kumar CH.
/tʃaɪθənjə/ /kʊmɑr/
+91-9494447584
17.2416N 80.1426E
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