Re: [OSGeo-Discuss] OSGEO4W future

[Yasser Said Lopez de Olmos Reyes]

Some of us use OSGEO4W just because we have to, Windows is still, by far,
the most widely used OS in the world. I think it's a great idea to give it
some more attention, especially to the new experimental 64-bit version.

I would be glad to contribute in any manner possible, but I need to learn
how to contribute. I'm not a software guru, I've been using Linux
(Mandriva, Fedora, Debian-based and Arch) for a long time but never learned
more than average user. Under Windows, maybe a little more advanced.

It could be useful to contact OSGEO4W team and find out what kind of help
they can use.


2013/9/20 Paolo Cavallini cavall...@faunalia.it

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 Hi all.
 OSGEO4W is a crucial piece of our infrastructure, and is one of the
 main services we are giving for the spread of GFOSS.
 I think it does not get the attention it deserves. The active
 developer team is very small, many packages are obsolete, and their
 update is far from regular. I'm not blaming everybody, I sincerely
 thank those who contribute; I just try to be objective. I think we
 should move forward quickly. I suggest to make a Steering Committee
 for OSGEO4W, so to have a clear roadmap, and give Windows (urgh!)
 users a predictable environment. I think some of our million users
 would be happy to support this effort, if they would know they
 contribute actively to something they need.
 My previous efforts to raise this question and to improve the
 situation have met with no success. I think time is now ripe to act.
 I'm available to help.
 All the best, and thanks.
 - --
 Paolo Cavallini - Faunalia
 www.faunalia.eu
 Full contact details at www.faunalia.eu/pc
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-- 
Saludos,

Yasser
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[OSGeo-Discuss] How to obtain selected adjacent pixel values?

[Yasser Said Lopez de Olmos Reyes]

Hello all, this is my first time using a subscriber list and I have some
doubts about using it and about grass gis.

I have an AML script (old arcinfo srcipt) that uses focal operations that
I've sorted out well using r.neighbors but I have a problem in certain part
of the script to follow in grass GIS. In some part of the script the author
declares a variable as a grid called cbd and codes as follows:

*%cb%d = int(abs((%cb% - %cb%(1,0)) + (%cb% - %cb%(0,1)) + (%cb% -
%cb%(0,-1)) + (%cb% - %cb%(-1,0*

From where he obtains a grid filled with integer positive values from 0 to
4. All these values come from a binary grid (0 or 1 values) declared as
cb where I believe* (%cb% - %cb%(1,0)) *means something like central
pixel value minus pixel value at west from central pixel value and *(%cb%
- %cb%(0,1)) *means something like central pixel value minus pixel value
at north from central pixel value, and so on...

How could I obtain the differences between central pixel values and
cardinal directions pixel values related with a central pixel?

Or in a different manner, how to do this in grass gis?

RASTER_OUT= round(abs((RASTER_IN - RASTER_IN_PUSHED_ONE_ROW_UP) +
(RASTER_IN - RASTER_IN_PUSHED_ONE_ROW_DOWN) + (RASTER_IN -
RASTER_IN_PUSHED_ONE_COLUMN_LEFT) + (RASTER_IN -
RASTER_IN_PUSHED_ONE_COLUMN_RIGHT))


Thanks in advance.

-- 
Saludos,

Yasser
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