[GRASS-user] Processing NAIP images

[Jiao Wang]

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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