Pictoprev_picto=find_picto(cat,coord_x,coord_y);//¿estamos reemplazanddo un picto que ya existe?
if(prev_picto!=null){//El picto ya existe
removePicto(prev_picto.get_category(),prev_picto.get_id());//borramos el picto local actual
Log.i(LOG_TAG,"Picto "+exp+" already exists. Previous local picto "+prev_picto.get_id()+" is deleted.");
Log.i(LOG_TAG,"Picto "+exp+" position is filled with "+prev_picto.get_translation()+"(id "+prev_picto.get_id()+"). Previous local picto "+prev_picto.get_id()+" is deleted.");