Fixed prj_equal for pyproj<2.5.

Signed-off-by: Daniel Scheffler <danschef@gfz-potsdam.de>

py_tools_ds/geo/projection.py

@@ -85,10 +85,16 @@ def prj_equal(prj1, prj2):
     if prj1 is None and prj2 is None or prj1 == prj2:
         return True
     else:
-        crs1 = CRS.from_user_input(prj1)
-        crs2 = CRS.from_user_input(prj2)
+        from pyproj import __version__ as ver
+        if ver.startswith('2') and int(ver.split('.')[1]) >= 5:
+            # CRS.equals was added in pyproj 2.5 which does not exist for Python 2.7 in conda-forge channel
+            crs1 = CRS.from_user_input(prj1)
+            crs2 = CRS.from_user_input(prj2)
 
-        return crs1.equals(crs2)
+            return crs1.equals(crs2)
+
+        else:
+            return get_proj4info(proj=prj1) == get_proj4info(proj=prj2)
 
 
 def isProjectedOrGeographic(prj):