def proj_obj(self): return EasyProjection(self.srs)
def set_easy_srs(self, srs): self.srs = EasyProjection(srs).params()
def lon_lat_layers_bounds(self): return self.layers_bounds().transform(self.proj_obj, EasyProjection(4326))
def set_srs_by_srid(self, srid): self.srs = EasyProjection(srid).params()
def lon_lat_bbox(self): return self.envelope().transform(self.proj_obj, EasyProjection(4326))