[OpendTect_Developers] Two pass attributes

[Nanne Hemstra]

Dear Fidel,

> Is it possible to calculate seismic attributes with global basis? For 
> example, is there a way to calculate a seismic attribute in two 
> steps:One for calculating the coefficients of a polynomial using all 
> the traces in the survey in a time interval, and (2) interpolating 
> with these coefficients the seismic traces, and giving these 
> interpolations as an attribute?
>

Good question. As you already say, all attributes are single trace or 
multi (neighbour) trace operations. To use (a subset of) all traces for 
calculating coefficients would be a kind of pre-processing step. One 
option is to make this coefficient calculation available from your 
attribute user interface and save the result as parameters to give to 
the attribute algorithm.

It's a bit similar to what we do in our FingerPrint attribute. The 
FingerPrint attribute needs a single vector of (other) attribute values 
as input. The calculation of this vector is done from the user 
interface. See:
$WORK/include/uiAttributes/uifingerprintattrib.h , 
$WORK/src/uiAttributes/uifingerprintattrib.cc
$WORK/include/Attributes/fingerprintattrib.h , 
$WORK/src/Attributes/fingerprintattrib.cc


Best regards,
Nanne Hemstra



-- 
Nanne Hemstra
OpendTect developer

dGB Earth Sciences
304, Gateway Plaza
Hiranandani Gardens, Powai
Mumbai - 400 076, India
Phone: +91 22 25704984 , Fax: +91 22 25704977
http://www.opendtect.org

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