[R-sig-Geo] image classification with GRASS

Nick Matzke matzke at berkeley.edu
Fri Dec 31 06:08:14 CET 2010

Hi all,

I've got R (with spgrass6) and GRASS installed on my Mac OS 
X machine.

My goal is to load and classify a .img file that was clipped 
out of a Landsat 7 ETM image in ERDAS.

However, GRASS seems to have a huge learning curve to even 
get started.  Could I beg some GRASS wizard to post the very 
basic commands that one would typically use to:

1. load a .img file into GRASS
2. Display it
3. Conduct a classification of the pixels (any sort of 
classification would be fine, even a simple 2-class 
unsupervised classification).

Thanks *very much* if you are able to help!  Normally I'm 
pretty good at this sort of thing, but GRASS is 
extra-intimidating to newbies.

Thanks, and cheers!

Nicholas J. Matzke
Ph.D. Candidate, Graduate Student Researcher
Huelsenbeck Lab
Center for Theoretical Evolutionary Genomics
4151 VLSB (Valley Life Sciences Building)
Department of Integrative Biology
University of California, Berkeley

Graduate Student Instructor, IB200A
Principles of Phylogenetics: Systematics

Lab websites:
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Lab personal page: 
Lab phone: 510-643-6299
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Cell phone: 510-301-0179
Email: matzke at berkeley.edu

Mailing address:
Department of Integrative Biology
3060 VLSB #3140
Berkeley, CA 94720-3140

"[W]hen people thought the earth was flat, they were wrong. 
When people thought the earth was spherical, they were 
wrong. But if you think that thinking the earth is spherical 
is just as wrong as thinking the earth is flat, then your 
view is wronger than both of them put together."

Isaac Asimov (1989). "The Relativity of Wrong." The 
Skeptical Inquirer, 14(1), 35-44. Fall 1989.

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