r.mapcalc doesn't have a definition for pi; you'll need to enter a
literal value.
Thanks Glynn. This sounds like a weak point for me.
I need to introduce "Pi" several times. Not for converting degrees to
radians. It is another class of applications. In this case to
calculate gravity anomalies.
José,
I have been interested in implementing potential fields function in
GRASS since long,
but I don't have the necessary background (I mean, I don't know the
equations) or the coding skills.
However, I can help you test/debug.
Maybe that could be the starting point for me to learn something about
it. Pointers to interesting sites/books/papers would be nice. =D
At my current job I have access to plenty of datasets and experts, so
we could use (borrow) further help =]
Glynn, ALL,
I would like to know where all these geophysics modules would fit.
I guess not in the i.* series, maybe in r.grav.* for gravity
data/functions or r.mag.* for magnetometry data.
--
Paulo Marcondes = PU1/PU2PIX
-22.915 -42.224 = GG86jc
2008/8/23 Paulo Marcondes <paulomarcondes@gmail.com>:
I have been interested in implementing potential fields function in
GRASS since long,
but I don't have the necessary background (I mean, I don't know the
equations) or the coding skills.
I would like to know where all these geophysics modules would fit.
I guess not in the i.* series, maybe in r.grav.* for gravity
data/functions or r.mag.* for magnetometry data.
What do you think?
--
Paulo Marcondes = PU1/PU2PIX
-22.915 -42.224 = GG86jc
On Monday 25 August 2008 08:59:33 am Paulo Marcondes wrote:
2008/8/23 Paulo Marcondes <paulomarcondes@gmail.com>:
> I have been interested in implementing potential fields function in
> GRASS since long,
> but I don't have the necessary background (I mean, I don't know the
> equations) or the coding skills.
However, we still don't have an answer to this:
> I would like to know where all these geophysics modules would fit.
> I guess not in the i.* series, maybe in r.grav.* for gravity
> data/functions or r.mag.* for magnetometry data.
Adding some more support behind geophysical routines / examples in GRASS, here
is a simple post illustrating some work with magnetic data in GRASS. See the
link to Stefan Maus' page for detailed descriptions and magnetic models.
On Monday 25 August 2008 08:59:33 am Paulo Marcondes wrote:
2008/8/23 Paulo Marcondes <paulomarcondes@gmail.com>:
> I have been interested in implementing potential fields function in
> GRASS since long,
> but I don't have the necessary background (I mean, I don't know the
> equations) or the coding skills.
At this moment, is only a first step. The info is not related directly
to GRASS, but I think that is correct to publish here. I look forward
to working alongside Paulo and others to add more information. Please,
correct me if I wrong
However, we still don't have an answer to this:
> I would like to know where all these geophysics modules would fit.
> I guess not in the i.* series, maybe in r.grav.* for gravity
> data/functions or r.mag.* for magnetometry data.
Adding some more support behind geophysical routines / examples in GRASS, here
is a simple post illustrating some work with magnetic data in GRASS. See the
link to Stefan Maus' page for detailed descriptions and magnetic models.
On Tuesday 26 August 2008, José María Michia wrote:
2008/8/25 Dylan Beaudette <dylan.beaudette@gmail.com>:
> On Monday 25 August 2008 08:59:33 am Paulo Marcondes wrote:
>> 2008/8/23 Paulo Marcondes <paulomarcondes@gmail.com>:
>> > I have been interested in implementing potential fields function in
>> > GRASS since long,
>> > but I don't have the necessary background (I mean, I don't know the
>> > equations) or the coding skills.
>>
>> As for gravity equations, the Geological Survey of Canada has a
>> informative page: http://gsc.nrcan.gc.ca/gravity/formulae_e.php
At this moment, is only a first step. The info is not related directly
to GRASS, but I think that is correct to publish here. I look forward
to working alongside Paulo and others to add more information. Please,
correct me if I wrong
Thanks. Another person/place to consult are Walter Smith / GMT mailing list.
Dylan, quite informative pages, thanks. As for the GMT info, it is a
shame I am not much into GMT, maybe that is a grave fault on my part?
Thanks Paolo. I'll post any new material directly in the wiki. GMT is tough to
get into, it took me a while to become comfortable with it. I would
reccommend looking over lots of examples if you are interested in learning.
Thanks Paolo. I'll post any new material directly in the wiki. GMT is tough to
get into, it took me a while to become comfortable with it. I would
reccommend looking over lots of examples if you are interested in learning.
I was just minutes ago talking to a friend, he was showing to me his
stuff done in GMT... really hard.
I guess I'll sometime have to learn it.
--
Paulo Marcondes = PU1/PU2PIX
-22.915 -42.224 = GG86jc