I'm following a tutorial about classifying pixels colours into categories and need to download the ROI Explorer plugin. Can't seem to find it anywhere however.
Does anyone know how I can get it or if there's an alternative?
My plan is to classify certain colours in satellite imagery so as to get an idea of % forest cover.
I think what you are looking for is the Semi Automatic Classification Plugin: https://plugins.qgis.org/plugins/SemiAutomaticClassificationPlugin/
It is a very good tool to do classifications of satellite imagery. Used it myself a lot and it is quite easy to handle. Also there are lots of tutorials available.
However, here is the link to ROIExplorer: https://plugins.qgis.org/plugins/roitool/ It seems to be pretty outdatet though, as the last update was in 2015. So chances are low it gets updated for QGIS3.
QGIS 3 represented a major overhaul of the program, and all plugins became obsolete when 3.0 was released. If you must use a plugin that hasn't been updated for QGIS 3, run an older version of QGIS. The previous long-term release version (2.18) is still available on the main downloads page. Older versions are available here.
