[GRASSLIST:3519] Re: Geophysics modules for GRASS

Benjamin Ducke benducke at compuserve.de
Thu May 27 14:09:18 EDT 2004

Well, that's great news. Actually, I feel pretty comfortable
about my skills when it comes to GRASS programming and user
interface/API design, but I am not much of physicists,
so I am glad to hear that you and your colleagues will provide 
all this support for the hard-core math stuff.

I agree that we should reuse as much existing functionality
as posssible. It's really just a matter of having all three,
a functional C API, a scripting interface and a set of
modules with a unified interface for the end user.

What is upward and downward correction?

On Thu, 27 May 2004 10:27:26 -0600
Craig Funk <funkmeister at lynxseismicdata.com> wrote:

> Hello, I really appreciate all the input and interest wrt geophysical 
> applications in GRASS. Benjamin, I look forward to seeing the first 
> version of your white paper. I live and work in Calgary Canada where 
> there are many Geophysicists (highest density in the world). I have 
> taken the liberty of contacting a few professors who are willing to 
> review the white paper and offer some input on the best 
> algorithm/approach to take for some of the modules.  My background is 
> mostly software engineering and I have worked extensively with 
> seismicity data and GIS systems. So while I have a working knowledge of 
> potential fields, I am a little out of touch with the state of the art.
> For example, there seems to be a number of different approaches to 
> incorporating DEM's into the terrain correction. My position on this is 
> that I do not really want to implement the latest and greatest but 
> rather the most robust and generally accepted approach.
> Other corrections like the free-air correction, latitude correction and 
> reduction to the pole are pretty straight forward.
> I would also like to implement modules to do upward and downward 
> continuation, any interest in this?
> Hamish has posted some good suggestions that I would like to follow. 
> Most importantly I would like to use as much of the existing GRASS 
> functionality as is possible. Not only will this reduce the amount of 
> work required but it is good software engineering practice as it will 
> minimize potential new bugs.
> Michael - the pictures you emailed are quite intriguing of the mag 
> data. I do have a lot of experience with 3-D data in GIS systems. Back 
> in the early 90's I was lead architect of a proprietary GIS system that 
> is used for analysis of induced seismicity in hard-rock mines. I also 
> implemented several modules to do iso-surface visualization and volume 
> visualization. An image is attached:

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