I'm using QGIS 3.0 with the expanded SAGA options. I created a training file in SAGA standalone that I am using, but would prefer the GRASS kappa comparasion options. I have already performed the classifications in SAGA standalone but want to use qgis. I'm just a little confused about if I'm going to perform the classification and select every band individually and if that will give me 6 outputs. It's a landsat 8 image, 30 km by 50km. If anyone knows of additional documention, tutorials about the saga toolbox within QGIS.
closed as too broad by PolyGeo♦ Oct 23 '18 at 19:49
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NASA runs online courses that use QGIS to classify Landsat imagery. Perhaps you can find some support there. Advanced Webinar: Land Cover Classification with Satellite Imagery
there is the Semi Automatic Classification plugin available for qgis 3.0 , there are lots of tutorials and documentation provided by both the author - luca congedo on his website : fromgistoremotesensing.com and also the arset nasa learning portal has tutorials too on supervised classification using the tool.