[GRASSLIST:5488] Re: GRASS image processing

[Michael Barton]

Grit,

I've used Imagine a bit and seen ENVI but not used it. Grass has fairly
complete image processing tools, especially in that image processing is
seamlessly integrated with high-end GIS and visualization rather than being
a separate program. This means a suite of raster manipulation tools,
including a map calculator and image fusion, can be applied to imagery. All
GRASS modules are scriptable, so that shell scripts (also perl or python for
the more sophisticated) can be written that automate many complex,
multi-step tasks and run in GRASS with a nice GUI.

A description of the dedicated image analysis modules in the current GRASS
6.0.0 beta1 distribution can be found at

<http://grass.itc.it/grass60/manuals/html60_user/imagery.html>

You should also look at the much larger suite of raster processing modules
that can be applied to images. Descriptions can be found at

<http://grass.itc.it/grass60/manuals/html60_user/raster.html>

Display options are found at
<http://grass.itc.it/grass60/manuals/html60_user/display.html> including
histogramming. 

N-dimensional visualization is available via the integrated NVIZ module
<http://grass.itc.it/gdp/nviz/nviz_toc.html>. NVIZ and GRASS 6 also support
true 3-D volumetric modeling and display (see
<http://grass.itc.it/grid3d/index.html>).

I'm hoping to finish a more up-to-date screenshot page by sometime next week
to show the current look of GRASS 6.

Several other very nice (and free software) tools for image manipulation
that are free are: 
Multispec (Purdue & NASA <http://dynamo.ecn.purdue.edu/~biehl/MultiSpec/>),
Hypercube (US Army <http://www.tec.army.mil/Hypercube/>),
ImageJ (NIH <http://rsb.info.nih.gov/ij/>), and
GIMP <http://www.gimp.org/>

Cheers,
Michael Barton

____________________
C. Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
PO Box 872402
Arizona State University
Tempe, AZ  85287-2402
USA

Phone: 480-965-6262
Fax: 480-965-7671
www: <www.public.asu.edu/~cmbarton>


On 1/22/05 3:39 AM, "Grit Schuster"
<grit.schuster at geographie.uni-freiburg.de> wrote:

> Dear Grasslisters,
> 
> I'm going to do some image processing of Landsat and ASTER
> Images. I'm a bit confused, because everybody in my environment
> is using ErdasImagine. So, could anybody please tell me about
> the capabilities and possibilities, pertaining to Image Processing
> Tools, provided by GRASS in comparison to ErdasImagine or ENVI.
> 
> Thank's a lot!
> 
> With best regards,
> 
> Grit
> 
> 
>