Poor quality images
I have regularly classified thousands of images over a long time.
It is extremely frustrating that all we seem to get now are B - or C or D-grade images all the time. Previously a small percentage were not good images, but now nearly 100% are either too dark - of land only - have complete cloud cover, etc etc.
Just know it is very frustrating to classify dozens of images and find none of a quality that can confidently be classified.
Why go to the trouble of putting up these useless images - or is it just a verification stage of reject images?
Whatever, I will do very few classifications until the quality of images resumes - despite my interest in the subject.