semiautomaticgit
commented
1 year ago Hello @lisa-kb please copy the log file following these steps https://semiautomaticclassificationmanual.readthedocs.io/en/latest/faq.html#how-can-i-report-an-error The issue could be related to pixel values or missing bands. About the change of the wavelength quick settings, probably you updated the plugin. However, if you opened a QGIS project with a saved Band set, the wavelength center is loaded from the project. Also, please have a look at the basic tutorials https://semiautomaticclassificationmanual.readthedocs.io/en/latest/tutorials.html
When creating training ROI for classification of a Landsat 8 image in QGIS 3.22 I get a warning message: 'Warning [12]: The following signature will be excluded if using Maximum Likelihood'. Even when making larger polygons I still get the warning, and only bands 2-7 were used as input for converting the bands to reflectance. (found this in another thread: https://www.facebook.com/groups/SemiAutomaticClassificationPlugin/posts/1984405614988960/?comment_id=5342870215809133)
The strange thing is just one day before I could do the classification of the same image and did not get a warning message. I also noticed that in the day before, the bandset definition for Landsat 8 in the wavelength quick settings was 'Landsat 8 OLI [bands 2,3,4,5,6,7]' and the next day when the classification did not work, the wavelength quick settings in the SCP window was suddenly 'Landsat 8 OLI [bands 1,2,3,4,5,6,7]' and the composite image was not the same as the day before (due to the incorrect wavelength definitions I suppose.. band 2 was defined as band 1 and so on) Could this be related to the problem with the training ROI's and is there a way to change it back/resolve this? I am fairly new at this, so maybe the solution is really obvious but I am not aware of this.