[GRASS-user] Processing NAIP images

[Pedro Camargo]

Thanks, Jiao!!  This helps a lot!!!

 

Pedro

 

 

From: Jiao Wang [mailto:jiao at hawaii.edu] 
Sent: Tuesday, January 28, 2014 1:02 PM
To: Pedro Camargo
Cc: GRASS user list
Subject: Re: [GRASS-user] Processing NAIP images

 

Hi Pedro,

 

I did a test run and created an unsupervised classification image.

 

Here are the steps I did:

 

1 MrSID to tiff in QGIS

2 import tiff in GRASS (i.in.gdal)

3 create group and subgroup (i.group ---check "Define also sub-group(same
name as group)"--- in the "Layers in selected group" keep one band file as
described in i.cluster manual)

4 classification --signature(i.cluster)

5 classification--map (i.maxlik)

 

Hope it helps.

 

Best,

Jiao

 

 

On Tue, Jan 28, 2014 at 9:00 AM, Pedro Camargo <veigacamargo at gmail.com>
wrote:

Hi,

       I am trying to generate land use maps (looking to identify roadways
only, actually) using NAIP imagery.

       Since I am using the pre-compiled GRASS, I do not have MrSID inside
GRASS, so converted the images to TIFF using QGIS.

      I believe I can use i.maxlik or something like that, but I do not know
how to start.  It keeps asking for groups, but I do not know what is a group
image.

      

    I googled a lot on this and looked into several tutorials, but still did
not figure out how to start  this.  I have been educating myself through a
few papers, but I guess I still need to find a good summarized tutorial on
how to do this with multi band images such as NAIP.

Does anybody have ideas to help?

Thanks,

Pedro


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