Issue #437 Better documentation of CRS code usage, and slightly more …

…test coverage

docs/api.rst

@@ -126,7 +126,7 @@ openeo.util
 -------------
 
 .. automodule:: openeo.util
-    :members: to_bbox_dict, BBoxDict, load_json_resource, string_to_temporal_extent
+    :members: to_bbox_dict, BBoxDict, load_json_resource, string_to_temporal_extent, normalize_crs
 
 
 openeo.processes

openeo/rest/datacube.py

@@ -304,7 +304,7 @@ def filter_bbox(
                 >>> cube.filter_bbox(west=3, south=51, east=4, north=52, crs=4326)
 
             - With a (west, south, east, north) list or tuple
-              (note that EPSG:4326 is the default CRS, so it's not nececarry to specify it explicitly)::
+              (note that EPSG:4326 is the default CRS, so it's not necessary to specify it explicitly)::
 
                 >>> cube.filter_bbox([3, 51, 4, 52])
                 >>> cube.filter_bbox(bbox=[3, 51, 4, 52])
@@ -327,7 +327,7 @@ def filter_bbox(
                 >>> cube.filter_bbox(bbox_param)
                 >>> cube.filter_bbox(bbox=bbox_param)
 
-            - With a CRS other than EPSG 4326::
+            - With a CRS other than EPSG 4326 (**see also parameters: crs**)::
 
                 >>> cube.filter_bbox(west=652000, east=672000, north=5161000, south=5181000, crs=32632)
 
@@ -337,6 +337,17 @@ def filter_bbox(
                 >>> west, east, north, south = 3, 4, 52, 51
                 >>> cube.filter_bbox(west, east, north, south)
 
+        :param crs: data structure that encodes a CRS, typically just an int or string value.
+            If the ``pyproj`` library is available, everything supported by it is allowed.
+
+            Integers always refer to the EPSG code that has that number assigned.
+            A string that contains only an integer it is treated the same way.
+
+            You can also specify EPSG codes as a formatted string, "EPSG:number".
+            For example, the following string and int values all specify to the same CRS:
+            ``"EPSG:4326"``, ``"4326"``, and the integer ``4326``.
+
+            .. seealso:: `openeo.org documentation on openeo.util.normalize_crs <api.html#openeo.util.normalize_crs>`_ for the most up to date information.
         """
         if args and any(k is not None for k in (west, south, east, north, bbox)):
             raise ValueError("Don't mix positional arguments with keyword arguments.")
@@ -827,6 +838,11 @@ def _get_geometry_argument(
     ) -> Union[dict, Parameter, PGNode]:
         """
         Convert input to a geometry as "geojson" subtype object.
+
+        :param crs: data structure that encodes a CRS, typically just an int or string value.
+            If the ``pyproj`` library is available, everything supported by it is allowed.
+            .. seealso:: `openeo.org documentation on openeo.util.normalize_crs <api.html#openeo.util.normalize_crs>`_ for the most up to date information.
+
         """
         if isinstance(geometry, (str, pathlib.Path)):
             # Assumption: `geometry` is path to polygon is a path to vector file at backend.

openeo/util.py

@@ -690,6 +690,19 @@ class BBoxDict(dict):
     Dictionary based helper to easily create/work with bounding box dictionaries
     (having keys "west", "south", "east", "north", and optionally "crs").
 
+    crs:
+        data structure that encodes a CRS, typically just an int or string value.
+        If the ``pyproj`` library is available, everything supported by it is allowed.
+
+        Integers always refer to the EPSG code that has that number assigned.
+        A string that contains only an integer it is treated the same way.
+
+        You can also specify EPSG codes as a formatted string, "EPSG:number".
+        For example, the following string and int values all specify to the same CRS:
+        ``"EPSG:4326"``, ``"4326"``, and the integer ``4326``.
+
+        .. seealso:: `openeo.org documentation on openeo.util.normalize_crs <api.html#openeo.util.normalize_crs>`_ for the most up to date information.
+
     .. versionadded:: 0.10.1
     """
 
@@ -811,7 +824,15 @@ def normalize_crs(crs: Any, *, use_pyproj: bool = True) -> Union[None, int, str]
         Other data structures will not be accepted.
 
     :param crs: data structure that encodes a CRS, typically just an int or string value.
-        If the ``pyproj`` library is available, everything supported by it is allowed
+        If the ``pyproj`` library is available, everything supported by it is allowed.
+
+        Integers always refer to the EPSG code that has that number assigned.
+        A string that contains only an integer it is treated the same way.
+
+        You can also specify EPSG codes as a formatted string, "EPSG:number".
+        For example, the following string and int values all specify to the same CRS:
+        ``"EPSG:4326"``, ``"4326"``, and the integer ``4326``.
+
     :param use_pyproj: whether ``pyproj`` should be leveraged at all
         (mainly useful for testing the "no pyproj available" code path)
 

tests/test_util.py

@@ -705,6 +705,13 @@ def test_init(self):
             "north": 4,
             "crs": 4326,
         }
+        assert BBoxDict(west=1, south=2, east=3, north=4, crs="4326") == {
+            "west": 1,
+            "south": 2,
+            "east": 3,
+            "north": 4,
+            "crs": 4326,
+        }
 
     def test_repr(self):
         d = BBoxDict(west=1, south=2, east=3, north=4)
@@ -731,6 +738,13 @@ def test_to_bbox_dict_from_sequence(self):
             "north": 4,
             "crs": 4326,
         }
+        assert to_bbox_dict([1, 2, 3, 4], crs="4326") == {
+            "west": 1,
+            "south": 2,
+            "east": 3,
+            "north": 4,
+            "crs": 4326,
+        }
 
     def test_to_bbox_dict_from_sequence_mismatch(self):
         with pytest.raises(InvalidBBoxException, match="Expected sequence with 4 items, but got 3."):
@@ -756,13 +770,27 @@ def test_to_bbox_dict_from_dict(self):
             "north": 4,
             "crs": 4326,
         }
+        assert to_bbox_dict({"west": 1, "south": 2, "east": 3, "north": 4, "crs": "4326"}) == {
+            "west": 1,
+            "south": 2,
+            "east": 3,
+            "north": 4,
+            "crs": 4326,
+        }
         assert to_bbox_dict({"west": 1, "south": 2, "east": 3, "north": 4}, crs="EPSG:4326") == {
             "west": 1,
             "south": 2,
             "east": 3,
             "north": 4,
             "crs": 4326,
         }
+        assert to_bbox_dict({"west": 1, "south": 2, "east": 3, "north": 4}, crs="4326") == {
+            "west": 1,
+            "south": 2,
+            "east": 3,
+            "north": 4,
+            "crs": 4326,
+        }
         assert to_bbox_dict(
             {
                 "west": 1,