Rename box corners

lib/box.py

@@ -52,21 +52,21 @@ class Box:
         self.lat_min, self.lat_max = value
 
     @property
-    def corner_ll(self):
+    def corner_bl(self):
         """Lower left corner."""
         return [self.lon_min, self.lat_min]
 
-    @corner_ll.setter
-    def corner_ll(self, value):
+    @corner_bl.setter
+    def corner_bl(self, value):
         self.lon_min, self.lat_min = value
 
     @property
-    def corner_ur(self):
+    def corner_tr(self):
         """Upper right corner."""
         return [self.lon_max, self.lat_max]
 
-    @corner_ur.setter
-    def corner_ur(self, value):
+    @corner_tr.setter
+    def corner_tr(self, value):
         self.lon_max, self.lat_max = value
 
     @property
@@ -86,7 +86,7 @@ class Box:
 
     def get_shape(self):
         """Get shapely Polygon object."""
-        sh = box(*self.corner_ll, *self.corner_ur)
+        sh = box(*self.corner_bl, *self.corner_tr)
         return sh
 
     def get_isel(self, ds, enlarge=False):