[GRASS-user] Semi-automatic classification with GRASS modules

[Michael Barton]

It is good to know about these more sophisticated alternatives for image classification. Nonetheless, if GRASS maintains i.cluster and i.maxlink in the default module distribution, it would be helpful to know why this is not working and/or have some kind of an error/warning message generated. I remember running into the same issue a year or two back. No information about why it did not work. It just didn't.

Michael

_________________________________
 
C. Michael Barton
Director, Center for Social Dynamics & Complexity 
Professor of Anthropology, School of Human Evolution & Social Change
Head, Graduate Faculty in Complex Adaptive Systems Science
Arizona State University
 
voice:  480-965-6262 (SHESC), 480-965-8130/727-9746 (CSDC)
fax: 480-965-7671 (SHESC),  480-727-0709 (CSDC)
www: http://www.public.asu.edu/~cmbarton, http://csdc.asu.edu

On 7/4/18, 4:28 AM, "grass-user on behalf of grass-user-request at lists.osgeo.org" <grass-user-bounces at lists.osgeo.org on behalf of grass-user-request at lists.osgeo.org> wrote:

    Date: Wed, 4 Jul 2018 12:20:31 +0200
    From: Markus Neteler <neteler at osgeo.org>
    To: Giuseppe Cillis <giucillis at gmail.com>
    Cc: GRASS user list <grass-user at lists.osgeo.org>
    Subject: Re: [GRASS-user] Semi-automatic classification with GRASS
    	modules
    Message-ID:
    	<CALFmHhuGEw2gkN3-y9A5KoBn7GFyNmXA7EC7nJ8TVUkhA1Wmrw at mail.gmail.com>
    Content-Type: text/plain; charset="UTF-8"
    
    Hi Giuseppe,
    
    On Wed, Jul 4, 2018 at 11:36 AM, Giuseppe Cillis <giucillis at gmail.com> wrote:
    >Hello everyone,
    >I'm applying between QGIS and GRASS to apply a semi-automatic classification
    >of aerial photos.
    >In practice I would like to use the combination of the grass modules in the
    >processing of QGIS; i.cluster and i.maxlink. My problem is that with
    >i.cluster I can not create the "spectral signature" which then must be used
    >in the second module. Why?
    >In practice I use two photo areas and I left (As proof) the preset
    >parameters but at the end of the process (Although it does not give me
    >errors), only a final report is created and no spectral signature files.
    >Why?
    
    Please consider to use more recent approaches like i.segment,
    r.learn.ml (addon), v.class.mlR (addon) etc.
    
    You can find an overview here which we presented at FOSDEM earlier this year:
    
    GRASS GIS in the sky: GRASS GIS as high-performance remote sensing toolbox
    https://urldefense.proofpoint.com/v2/url?u=https-3A__fosdem.org_2018_schedule_event_geo-5Fgrass_&d=DwIGaQ&c=l45AxH-kUV29SRQusp9vYR0n1GycN4_2jInuKy6zbqQ&r=lk-7X7CEOMDN8GaGVhiDsuO6gEp1wbG6nfT1XEEEtR0&m=NQiNf3lva5k8INoJ_gDB3F0ZINo7d7Na6o5kn-qXBCg&s=4vvZpiQIY12pfnXKjne9n1831FDWU7ntAd184ki1o-Q&e=
    
    Best
    Markus