“…The methods applied in the discussed papers vary from traditional image analysis techniques including thresholding and template matching to segmentation and supervised/unsupervised classification, but still, no deep learning method is mentioned. Even though papers related to machine learning applications on unmanned aerial vehicle- (UAV) or satellite-derived images have been published so far [ 43 , 44 , 45 , 46 , 47 ], the studies focusing on on-ground photography are limited [ 48 , 49 ]. At the same time, digital photography has entered a new era with the availability of cloud-storage and location-aware cameras and smart-phones that enable the sharing of photographs on a truly massive scale.…”