In the case of GE1, three different tests were carried out. The first of them was based on the GE9
PAN and pan-sharpened orthoimages (Single GE9). The second one used the GE23 PAN and
pan-sharpened orthoimages (Single GE23). Finally, the third test considered all the information
included in the two first cases, i.e., it used features from GE9 and GE23 orthoimages (stereo GE1).
Moreover, the features from image objects were grouped into 10 strategies for classification: