diff --git a/pygmt/tests/baseline/test_grdimage_grid_no_redunant_360.png.dvc b/pygmt/tests/baseline/test_grdimage_grid_no_redunant_360.png.dvc new file mode 100644 index 00000000000..55edc71dbfe --- /dev/null +++ b/pygmt/tests/baseline/test_grdimage_grid_no_redunant_360.png.dvc @@ -0,0 +1,5 @@ +outs: +- md5: 6145622653eaedd2b4845400aa09ac75 + size: 239431 + hash: md5 + path: test_grdimage_grid_no_redunant_360.png diff --git a/pygmt/tests/test_grdimage.py b/pygmt/tests/test_grdimage.py index 8f0e538d270..ee48875240a 100644 --- a/pygmt/tests/test_grdimage.py +++ b/pygmt/tests/test_grdimage.py @@ -5,7 +5,9 @@ import numpy as np import pytest import xarray as xr +from packaging.version import Version from pygmt import Figure +from pygmt.clib import __gmt_version__ from pygmt.datasets import load_earth_relief from pygmt.exceptions import GMTInvalidInput from pygmt.helpers.testing import check_figures_equal @@ -252,3 +254,41 @@ def test_grdimage_imgout_fails(grid): fig.grdimage(grid, img_out="out.png") with pytest.raises(GMTInvalidInput): fig.grdimage(grid, A="out.png") + + +@pytest.mark.xfail( + condition=Version(__gmt_version__) <= Version("6.5.0"), + reason="Upstream bug fixed in https://github.com/GenericMappingTools/gmt/pull/8554", +) +@pytest.mark.mpl_image_compare() +def test_grdimage_grid_no_redunant_360(): + """ + Test that global grids with and without redundant 360/0 longitude values work. + + Test for https://github.com/GenericMappingTools/pygmt/issues/3331. + """ + # Global grid [-180, 180, -90, 90] with redundant longitude at 180/-180 + da1 = load_earth_relief(region=[-180, 180, -90, 90]) + # Global grid [0, 360, -90, 90] with redundant longitude at 360/0 + da2 = load_earth_relief(region=[0, 360, -90, 90]) + + # Global grid [-180, 179, -90, 90] without redundant longitude at 180/-180 + da3 = da1[:, 0:360] + da3.gmt.registration, da3.gmt.gtype = 0, 1 + assert da3.shape == (181, 360) + assert da3.lon.to_numpy().min() == -180.0 + assert da3.lon.to_numpy().max() == 179.0 + + # Global grid [0, 359, -90, 90] without redundant longitude at 360/0 + da4 = da2[:, 0:360] + da4.gmt.registration, da4.gmt.gtype = 0, 1 + assert da4.shape == (181, 360) + assert da4.lon.to_numpy().min() == 0.0 + assert da4.lon.to_numpy().max() == 359.0 + + fig = Figure() + kwdict = {"projection": "W120/10c", "region": "g", "frame": "+tlon=120"} + fig.grdimage(da3, **kwdict) + fig.shift_origin(xshift="w+2c") + fig.grdimage(da4, **kwdict) + return fig