[GRASS-dev] Re: [GRASSGUI] Adding a Raster Group as layer

[Michael Barton]

Yann,


It sounds like what you are suggesting is to create a GUI module that would
open a group and use various GRASS commands to do something with it--display
it, PCA, colors, etc. Kind of a comprehensive imaging module. This is a nice
idea. Once we have the main functionality done in wxgrass, it would be worth
considering how to build (or someone else can start on it now).

Michael


On 5/23/07 12:04 AM, "Yann" <yann.chemin at gmail.com> wrote:

> Hello Michael,
> 
> I cannot confirm now, but some times back i was told so about the automatic
> creation of a group when importing a multi-band image file with r.in.gdal.
> 
> But this is not the main issue here, once we do have a group it would be nice
> to load it and
> 1-select any layer or any three layers and press display, it could understand
> load a single layer or a d.rgb triplet.
> 2-various color enhancements could be synchronized/automatized indeed (i.e.
> auto: grey all layers in this group, auto: transparency 30% for all layers,
> auto: r.null setnull value=0 for all layers, ...).
> 
> there are few other things that can be simplified/synchronized through that
> menu (pca and other functions that input a large number of files, this could
> be simplified if they are already selected).
> 
> Yann
> 
> On Wednesday 23 May 2007 13:36, you wrote:
>> Evening Yann,
>> 
>> On 5/22/07 10:40 PM, "Yann" <yann.chemin at gmail.com> wrote:
>>> After importing a multispectral image with r.in.gdal, a group is created
>>> holding all these layers.
>> 
>> I don't follow you on this. What kind of group? AFAIK, r.in.gdal just
>> creates a set of separate raster files with identical prefixed names. Does
>> it build an image group?
>> 
>>> Could we have a button that would show/select/load any existing group in
>>> the GUI (it could have a tree inside for all the bands available).
>>> 
>>> Once loaded we could select one or any combination of 3 bands for
>>> display.
>> 
>> Putting the maps in separate layers would simply overlay one on top of the
>> other, not recombine them into an RGB image again. This would have to take
>> place within d.rgb.
>> 
>> Following your idea, an enhanced d.rgb would be able to load a group, in
>> addtion to just any individual layer, making layer selection more
>> convenient for bands of a multiband image. I'd add that it should also have
>> a couple of options for doing automatic equalization stretches (linear,
>> log, and gaussian if I want to imagine a really nice module) on the bands
>> before it displays them.
>> 
>> Michael
>> 
>> __________________________________________
>> Michael Barton, Professor of Anthropology
>> School of Human Evolution & Social Change
>> Center for Social Dynamics & Complexity
>> Arizona State University
>> 
>> phone: 480-965-6213
>> fax: 480-965-7671
>> www: http://www.public.asu.edu/~cmbarton

__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution & Social Change
Center for Social Dynamics & Complexity
Arizona State University

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton