[OpendTect_Users] Convert UTM Zone in segy file

[Salva]

There is a Opensource Geographic Translator that you could use to 
transform an ascii file with navigation:

  http://earth-info.nga.mil/GandG/geotrans/

I hope this can help.

Salva

El 04/04/11 17:12, Arnaud Huck escribió:
> Dear Michel, Duncan,
>
> I wish to remind you that all data loaded in OpendTect is referenced
> with respect to the seismic inlines and crosslines, except for the 2D
> seismic lines and well deviation surveys.
> The coordinates are always computed using the transformation defined by
> the survey geometry. As a result, one could alter the survey geometry
> coordinates (for instance divide all coordinates by 10 if you forget to
> scale the trace coordinates during import from SEG-Y) without having to
> re-load all data.
>
> Also incoming v4.2 will feature a 2D Geometry manager allowing this kind
> of data manipulation for loaded 2D data (seismic lines, 2D interpretations).
>
> Finally, I would propose the following workflow:
> 1- Load both surveys using their geometry
> 2- Use an online utility to convert the corner points of survey #2 to
> the UTM zone of survey #1 (see
> http://www.uwgb.edu/dutchs/usefuldata/ConvertUTMNoOZ.HTM)
>
> Also we are building a seismic survey gridder, that will be released in
> the next development release of OpendTect 4.3, after 4.2. This will add
> step 3 to the workflow (requires both surveys to use the same X-Y reference)
> 3- Import (grid) the data from survey #2 on the grid of survey #1, in
> survey #1.
>
> Best regards,
> Arnaud Huck.
>
> -- Senior Geoscientist
> -- dGB Earth Sciences
> -- Nijverheidstraat 11-2, 7511 JM Enschede, The Netherlands
> -- mailto: arnaud.huck at dgbes.com, http://www.dgbes.com
> -- Tel: +31 53 4315155 , Fax: +31 53 4315104
>
>
> On 04/01/2011 09:28 AM, Duncan Irving wrote:
>> Hi,
>>
>> I've done this with 2D in Seismic Unix so the principle should apply
>> although the technicalities will need to be enhanced for trace indexing:
>>
>> 1/ Dump the trace headers so that you are left with traceids,
>> shotpoints, CDPs and (lat,lon). You will need to have a way of indexing
>> the traces in the survey for later.
>> 2/ Use GMT (gmtproject) to convert the UTM zone. This is fiddly to set
>> up but will be a one-liner when you have the parameters correct.
>> 3/ Re-write the (lat,lon)s back into the original file. I'm not sure how
>> you would do this with a 3D volume - maybe Madagascar? I looped through
>> 2D lines trace-by-trace but this may be more challenging with a 3D survey.
>>
>> I did this a few years ago with bash, Seismic Unix and GMT. You can
>> probably do the whole thing more elegantly with python nowadays.
>>
>> Maybe someone has a more modern approach? :-)
>>
>> Duncan
>>
>>
>> On 31/03/2011 22:32, Michael Heeremans wrote:
>>>     Hi,
>>>
>>>     I have a project with a lot of data already loaded. now I would like to
>>>     add another seismic survey, but tgis survey has stored its XY
>>>     coordinates in a different UTM zone. Any suggestions how I could convert
>>>     the coordinates to the 'correct' UTM zone?
>>>
>>>     Many thanks i advance,
>>>
>>>     Michel Heeremans
>>>
>>
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