Bugfix: bug fix in spectral 2D grid y ax

mikeio/spatial/_grid_geometry.py

@@ -700,7 +700,10 @@ def y(self) -> np.ndarray:
 
         y1 = y0 + self.dy * (self.ny - 1)
         y_local = np.linspace(y0, y1, self.ny)
-        return y_local if self._is_rotated else y_local + self._origin[1]
+        if self._is_rotated or self.is_spectral:
+            return y_local
+        else:
+            return y_local + self._origin[1]
 
     @property
     def nx(self) -> int:

tests/test_dfs2.py

@@ -25,6 +25,12 @@ def dfs2_random_2items():
     return mikeio.open(filepath)
 
 
+@pytest.fixture
+def dfs2_pt_spectrum_geographical():
+    filepath = Path("tests/testdata/spectra/pt_spectra_geographical.dfs2")
+    return mikeio.open(filepath, type="spectral")
+
+
 @pytest.fixture
 def dfs2_pt_spectrum():
     filepath = Path("tests/testdata/spectra/pt_spectra.dfs2")
@@ -312,6 +318,31 @@ def test_properties_pt_spectrum(dfs2_pt_spectrum):
     assert g.orientation == 0
 
 
+def test_properties_pt_spectrum_geographical(dfs2_pt_spectrum_geographical):
+    dfs = dfs2_pt_spectrum_geographical
+    assert dfs.x0 == pytest.approx(0.055)
+    assert dfs.y0 == 0
+    assert dfs.dx == pytest.approx(1.1)
+    assert dfs.dy == 22.5
+    assert dfs.nx == 25
+    assert dfs.ny == 16
+    assert dfs.longitude == pytest.approx(0, abs=1e-6)
+    assert dfs.latitude == 0
+    assert dfs.orientation == 0
+    assert dfs.n_items == 1
+    assert dfs.n_timesteps == 31
+
+    g = dfs.geometry
+    assert g.is_spectral
+    assert g.x[0] == pytest.approx(0.055)
+    # assert g.x[-1] > 25  # if considered linear
+    assert g.x[-1] < 0.6  # logarithmic
+    assert g.y[0] == 0
+    assert g.dx == pytest.approx(1.1)
+    assert g.dy == 22.5
+    assert g.orientation == 0
+
+
 def test_properties_pt_spectrum_linearf(dfs2_pt_spectrum_linearf):
     dfs = dfs2_pt_spectrum_linearf
     # This file doesn't have a valid projection string