Removed unused log and improve docstring

sunpy/map/mapbase.py

@@ -28,7 +28,7 @@
 import sunpy.coordinates
 import sunpy.io as io
 import sunpy.visualization.colormaps
-from sunpy import config, log
+from sunpy import config
 from sunpy.coordinates import HeliographicCarrington, HeliographicStonyhurst, get_earth, sun
 from sunpy.coordinates.utils import get_rectangle_coordinates
 from sunpy.image.resample import resample as sunpy_image_resample
@@ -1446,7 +1446,9 @@ def submap(self, bottom_left, *, top_right=None, width: (u.deg, u.pix) = None, h
         Returns a submap defined by a rectangle.
 
         Any pixels which have at least part of their area inside the rectangle
-        are returned.
+        are returned. If the rectangle is defined in world coordinates, the
+        smallest array which contains all four corners of the rectangle as
+        defined in world coordinates are defined.
 
         Parameters
         ----------
@@ -1471,9 +1473,6 @@ def submap(self, bottom_left, *, top_right=None, width: (u.deg, u.pix) = None, h
 
         Notes
         -----
-        If top_right is below or to the left of bottom_left, a message is logged
-        at the debug level to the sunpy logger.
-
         When specifying pixel coordinates, they are specified in Cartesian
         order not in numpy order. So, for example, the ``bottom_left=``
         argument should be ``[left, bottom]``.
@@ -1605,12 +1604,6 @@ def submap(self, bottom_left, *, top_right=None, width: (u.deg, u.pix) = None, h
         left = np.min(pixel_corners[0]).to_value(u.pix)
         right = np.max(pixel_corners[0]).to_value(u.pix)
 
-        if left > right:
-            log.debug("The rectangle is inverted in the left/right direction.")
-
-        if bottom > top:
-            log.debug("The rectangle is inverted in the bottom/top direction.")
-
         # Round the lower left pixel to the nearest integer
         # We want 0.5 to be rounded up to 1, so use floor(x + 0.5)
         bottom = np.floor(bottom + 0.5)