[GRASSLIST:3466] v.cutter

Luis Gonçalves Seco luis at novalis.web.pt
Sat May 22 17:47:53 EDT 2004

I whould like to know how can i do this:
Suppose I have a mount (vector) that belong to a city(vector), but the mount
area it exceeds is border. If i use v.cutter the result will be the inside
part of the interseption, no?. But I want to know how I can obtain only the
part that don´t belong to the city area (outside part). In raster mode I can
do that, but I need that in vector mode. Probably if I used the result of
the v.cutter then make v.patch with the mount vector and finally with
v.extrat I will obtain the result. There is an easy and logic way to do


Luis Gonçalves Seco

-----Mensagem original-----
De: owner-GRASSLIST at baylor.edu [mailto:owner-GRASSLIST at baylor.edu] Em nome
de Benjamin Ducke
Enviada: sábado, 22 de Maio de 2004 9:48
Para: grasslist at baylor.edu
Assunto: [GRASSLIST:3465] Re: Geophysical/Potential field modules for GRASS?

As an archaeologist, I also work with geophysical data
regularly (especially gradiometer data). So far,  I have used proprietary
such as Geoplot to view and filter data (trend removal/destriping, low/high
pass filters etc.).
But I think that GRASS is, in principle, an ideal platform
for such tasks. I have already spent some time laying out an infrastructure
geophysical data processing with GRASS.
I have also made plans to create some module myself - in the near future ;)
The wonderfull "Scientific Applications on Linux" web repository
has a category for "Computer Graphics, Images & Signals: Processing &
In it, I found a link to the "XITE" image processing tools.
XITE also has an open source C library that seems to have ever imaginable
high-level functionality one would need.
I think one could get started ang get functionality very quickly by
integrating this library with
So, if there is any serious interest in getting GRASS up to par with Imagine
and the like,
maybe we should pull forces together and start coding?
Anyone else interested in this sort of functionality?



On Fri, 21 May 2004 10:50:41 -0600
Funkmeister <funkmeister at lynxseismicdata.com> wrote:

> Hello, I will need to process/interpret some geophysical data (gravity, 
> mag) and I would like to use GRASS for this purpose. Is anyone aware of 
> any modules available for GRASS? I need to do things like trend 
> removal, terrian corrections, Bouguer correction, reduction to pole, 
> downward continuation, etc. I will also need to apply any number of 2-D 
> filters.
> If there are no suitable modules, I will likely write them. So please 
> also let me know if anyone else is interested in such modules, and 
> features that would be desired.
> Thank you,
> Craig

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