Merge pull request #4095 from OSGeo/backport-4089-to-master

[Backport master] Doc: add note warning that stere/sterea are different things and …
OSGeo · Mar 19, 2024 · a3110b7 · a3110b7
2 parents 4f635b1 + 9aebac7
commit a3110b7
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diff --git a/docs/plot/plotdefs.json b/docs/plot/plotdefs.json
@@ -1346,13 +1346,13 @@
     },
     {
         "filename": "sterea.png",
-        "latmax": 90,
-        "latmin": 50,
-        "lonmax": 180,
-        "lonmin": -180,
+        "latmax": 70,
+        "latmin": 30,
+        "lonmax": 50,
+        "lonmin": -50,
         "name": "sterea",
-        "projstring": "+proj=sterea +lat_0=90",
-        "res": "low",
+        "projstring": "+proj=sterea +lat_0=52.1561605555556 +lon_0=5.38763888888889 +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel",
+        "res": "med",
         "type": "poly"
     },
     {

diff --git a/docs/source/operations/projections/images/sterea.png b/docs/source/operations/projections/images/sterea.png
diff --git a/docs/source/operations/projections/stere.rst b/docs/source/operations/projections/stere.rst
@@ -28,6 +28,12 @@ Stereographic
 
    proj-string: ``+proj=stere +lat_0=90 +lat_ts=75``
 
+.. note::
+
+    This projection method gives different results than the :ref:`sterea`
+    method in the non-polar cases (i.e. the oblique and equatorial case). The later
+    projection method is the one referenced by EPSG as "Oblique Stereographic".
+
 Parameters
 ################################################################################
 

diff --git a/docs/source/operations/projections/sterea.rst b/docs/source/operations/projections/sterea.rst
@@ -26,7 +26,14 @@ Oblique Stereographic Alternative
    :align: center
    :alt:   Oblique Stereographic Alternative
 
-   proj-string: ``+proj=sterea +lat_0=90``
+   proj-string: ``+proj=sterea +lat_0=52.1561605555556 +lon_0=5.38763888888889 +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel``
+
+.. note::
+
+    This projection method, referenced by EPSG as "Oblique Stereographic", is
+    for example used for the Netherlands "Amersfoort / RD New" projected CRS.
+    It gives different results than the :ref:`stere` method in the non-polar cases
+    (i.e. the oblique and equatorial case).
 
 Parameters
 ################################################################################