Hi all, you may want to consider topography-driven classification: by that I mean a classification restricted to proper sub-areas; in particular we have explored the use of both rectangular areas and slope units, for the specific purpose of landlisde mapping, in this paper:
https://doi.org/10.1080/19475705.2018.1458050 we expect the method to work for purposes other than landslide mapping, and to be even more effective in locations at larger latitudes, where shades are more relevant to the specific spectral response of each given terrain class, in a given sub-area. Massi 2018-07-04 12:20 GMT+02:00 Markus Neteler <[email protected]>: > Hi Giuseppe, > > On Wed, Jul 4, 2018 at 11:36 AM, Giuseppe Cillis <[email protected]> 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://fosdem.org/2018/schedule/event/geo_grass/ > > Best > Markus > > -- > Markus Neteler, PhD > http://www.mundialis.de - free data with free software > http://grass.osgeo.org > http://courses.neteler.org/blog > _______________________________________________ > grass-user mailing list > [email protected] > https://lists.osgeo.org/mailman/listinfo/grass-user _______________________________________________ grass-user mailing list [email protected] https://lists.osgeo.org/mailman/listinfo/grass-user
