cartopy
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SciTools
`contourf` only drawing one level
Description
This is an Iris-free reproducer of https://github.com/SciTools/cartopy/issues/1076#issuecomment-1026018858. Note that Iris has its own automatic equivalent of add_cyclic, which is required to reproduce the problem.
Code to reproduce
(the data file temp.nc is in the attached temp.zip)
import numpy as np
import matplotlib.pyplot as plt
from xarray import open_dataset
import cartopy.util
import cartopy.crs as ccrs
ds = open_dataset('temp.nc')
da = ds.air_pressure_at_sea_level
mslp, lon, lat = cartopy.util.add_cyclic(da.data, da.longitude, da.latitude)
proj = ccrs.Orthographic(central_longitude=0.0, central_latitude=90.0)
def plot_mslp(n_levels):
ax=plt.axes(projection=proj)
ax.contourf(lon, lat, mslp, levels=np.linspace(-9, 0, n_levels), transform=ccrs.PlateCarree())
ax.coastlines()
plt.show()
for n_levels in [10, 11]:
plot_mslp(n_levels)
Actual Output
Expected Output
Without the call to add_cyclic, we get
Full environment definition
Operating system
Ubuntu
Cartopy version
main, v0.24
conda list
# packages in environment at /home/ruth/miniforge3/envs/cartopy-dev:
#
# Name Version Build Channel
_libgcc_mutex 0.1 conda_forge conda-forge
_openmp_mutex 4.5 2_gnu conda-forge
accessible-pygments 0.0.5 pyhd8ed1ab_0 conda-forge
alabaster 1.0.0 pyhd8ed1ab_0 conda-forge
asttokens 2.4.1 pyhd8ed1ab_0 conda-forge
babel 2.14.0 pyhd8ed1ab_0 conda-forge
beautifulsoup4 4.12.3 pyha770c72_0 conda-forge
blosc 1.21.6 hef167b5_0 conda-forge
brotli 1.1.0 hb9d3cd8_2 conda-forge
brotli-bin 1.1.0 hb9d3cd8_2 conda-forge
brotli-python 1.1.0 py312h2ec8cdc_2 conda-forge
bzip2 1.0.8 h4bc722e_7 conda-forge
c-ares 1.33.1 heb4867d_0 conda-forge
ca-certificates 2024.8.30 hbcca054_0 conda-forge
cartopy 0.24.2.dev30+gd8e8bdf9 pypi_0 pypi
certifi 2024.8.30 pyhd8ed1ab_0 conda-forge
cffi 1.17.1 py312h06ac9bb_0 conda-forge
cfgv 3.3.1 pyhd8ed1ab_0 conda-forge
cftime 1.6.4 py312hc0a28a1_1 conda-forge
charset-normalizer 3.3.2 pyhd8ed1ab_0 conda-forge
colorama 0.4.6 pyhd8ed1ab_0 conda-forge
contourpy 1.3.0 py312h68727a3_2 conda-forge
cycler 0.12.1 pyhd8ed1ab_0 conda-forge
cython 3.0.11 py312h8fd2918_3 conda-forge
dataclasses 0.8 pyhc8e2a94_3 conda-forge
decorator 5.1.1 pyhd8ed1ab_0 conda-forge
distlib 0.3.8 pyhd8ed1ab_0 conda-forge
docutils 0.21.2 pyhd8ed1ab_0 conda-forge
exceptiongroup 1.2.2 pyhd8ed1ab_0 conda-forge
execnet 2.1.1 pyhd8ed1ab_0 conda-forge
executing 2.1.0 pyhd8ed1ab_0 conda-forge
filelock 3.16.1 pyhd8ed1ab_0 conda-forge
fonttools 4.54.1 py312h66e93f0_0 conda-forge
freetype 2.12.1 h267a509_2 conda-forge
geos 3.13.0 h5888daf_0 conda-forge
h2 4.1.0 pyhd8ed1ab_0 conda-forge
hdf4 4.2.15 h2a13503_7 conda-forge
hdf5 1.14.4 nompi_h2d575fe_101 conda-forge
hpack 4.0.0 pyh9f0ad1d_0 conda-forge
hyperframe 6.0.1 pyhd8ed1ab_0 conda-forge
icu 75.1 he02047a_0 conda-forge
identify 2.6.1 pyhd8ed1ab_0 conda-forge
idna 3.10 pyhd8ed1ab_0 conda-forge
imagesize 1.4.1 pyhd8ed1ab_0 conda-forge
importlib_resources 6.4.5 pyhd8ed1ab_0 conda-forge
iniconfig 2.0.0 pyhd8ed1ab_0 conda-forge
ipython 8.28.0 pyh707e725_0 conda-forge
jedi 0.19.1 pyhd8ed1ab_0 conda-forge
jinja2 3.1.4 pyhd8ed1ab_0 conda-forge
keyutils 1.6.1 h166bdaf_0 conda-forge
kiwisolver 1.4.7 py312h68727a3_0 conda-forge
krb5 1.21.3 h659f571_0 conda-forge
lcms2 2.16 hb7c19ff_0 conda-forge
ld_impl_linux-64 2.43 h712a8e2_1 conda-forge
lerc 4.0.0 h27087fc_0 conda-forge
libaec 1.1.3 h59595ed_0 conda-forge
libblas 3.9.0 24_linux64_openblas conda-forge
libbrotlicommon 1.1.0 hb9d3cd8_2 conda-forge
libbrotlidec 1.1.0 hb9d3cd8_2 conda-forge
libbrotlienc 1.1.0 hb9d3cd8_2 conda-forge
libcblas 3.9.0 24_linux64_openblas conda-forge
libcurl 8.10.1 hbbe4b11_0 conda-forge
libdeflate 1.21 h4bc722e_0 conda-forge
libedit 3.1.20191231 he28a2e2_2 conda-forge
libev 4.33 hd590300_2 conda-forge
libexpat 2.6.3 h5888daf_0 conda-forge
libffi 3.4.2 h7f98852_5 conda-forge
libgcc 14.1.0 h77fa898_1 conda-forge
libgcc-ng 14.1.0 h69a702a_1 conda-forge
libgfortran 14.1.0 h69a702a_1 conda-forge
libgfortran-ng 14.1.0 h69a702a_1 conda-forge
libgfortran5 14.1.0 hc5f4f2c_1 conda-forge
libgomp 14.1.0 h77fa898_1 conda-forge
libiconv 1.17 hd590300_2 conda-forge
libjpeg-turbo 3.0.0 hd590300_1 conda-forge
liblapack 3.9.0 24_linux64_openblas conda-forge
libnetcdf 4.9.2 nompi_h2564987_115 conda-forge
libnghttp2 1.58.0 h47da74e_1 conda-forge
libnsl 2.0.1 hd590300_0 conda-forge
libopenblas 0.3.27 pthreads_hac2b453_1 conda-forge
libpng 1.6.44 hadc24fc_0 conda-forge
libsqlite 3.46.1 hadc24fc_0 conda-forge
libssh2 1.11.0 h0841786_0 conda-forge
libstdcxx 14.1.0 hc0a3c3a_1 conda-forge
libstdcxx-ng 14.1.0 h4852527_1 conda-forge
libtiff 4.7.0 h6565414_0 conda-forge
libuuid 2.38.1 h0b41bf4_0 conda-forge
libwebp-base 1.4.0 hd590300_0 conda-forge
libxcb 1.17.0 h8a09558_0 conda-forge
libxcrypt 4.4.36 hd590300_1 conda-forge
libxml2 2.12.7 he7c6b58_4 conda-forge
libxslt 1.1.39 h76b75d6_0 conda-forge
libzip 1.11.1 hf83b1b0_0 conda-forge
libzlib 1.3.1 hb9d3cd8_2 conda-forge
lxml 5.3.0 py312he28fd5a_1 conda-forge
lz4-c 1.9.4 hcb278e6_0 conda-forge
markupsafe 2.1.5 py312h66e93f0_1 conda-forge
matplotlib-base 3.9.2 py312he9b69db_201 conda-forge/label/testing
matplotlib-inline 0.1.7 pyhd8ed1ab_0 conda-forge
munkres 1.1.4 pyh9f0ad1d_0 conda-forge
ncurses 6.5 he02047a_1 conda-forge
netcdf4 1.7.1 nompi_py312ha728dd9_103 conda-forge
nodeenv 1.9.1 pyhd8ed1ab_0 conda-forge
numpy 2.1.1 py312h58c1407_0 conda-forge
openjpeg 2.5.2 h488ebb8_0 conda-forge
openssl 3.3.2 hb9d3cd8_0 conda-forge
owslib 0.31.0 pyhd8ed1ab_0 conda-forge
packaging 24.1 pyhd8ed1ab_0 conda-forge
pandas 2.2.2 py312h1d6d2e6_1 conda-forge
parso 0.8.4 pyhd8ed1ab_0 conda-forge
pexpect 4.9.0 pyhd8ed1ab_0 conda-forge
pickleshare 0.7.5 py_1003 conda-forge
pillow 10.4.0 py312h56024de_1 conda-forge
pip 24.2 pyh8b19718_1 conda-forge
platformdirs 4.3.6 pyhd8ed1ab_0 conda-forge
pluggy 1.5.0 pyhd8ed1ab_0 conda-forge
pre-commit 4.0.0 pyha770c72_0 conda-forge
proj 9.5.0 h12925eb_0 conda-forge
prompt-toolkit 3.0.48 pyha770c72_0 conda-forge
pthread-stubs 0.4 hb9d3cd8_1002 conda-forge
ptyprocess 0.7.0 pyhd3deb0d_0 conda-forge
pure_eval 0.2.3 pyhd8ed1ab_0 conda-forge
pycparser 2.22 pyhd8ed1ab_0 conda-forge
pydata-sphinx-theme 0.15.4 pyhd8ed1ab_0 conda-forge
pygments 2.18.0 pyhd8ed1ab_0 conda-forge
pykdtree 1.3.13 py312hc0a28a1_1 conda-forge
pyparsing 3.1.4 pyhd8ed1ab_0 conda-forge
pyproj 3.7.0 py312he630544_0 conda-forge
pyshp 2.3.1 pyhd8ed1ab_0 conda-forge
pysocks 1.7.1 pyha2e5f31_6 conda-forge
pytest 8.3.3 pyhd8ed1ab_0 conda-forge
pytest-mpl 0.17.0 pyhd8ed1ab_0 conda-forge
pytest-xdist 3.6.1 pyhd8ed1ab_0 conda-forge
python 3.12.7 hc5c86c4_0_cpython conda-forge
python-dateutil 2.9.0 pyhd8ed1ab_0 conda-forge
python-tzdata 2024.2 pyhd8ed1ab_0 conda-forge
python_abi 3.12 5_cp312 conda-forge
pytz 2024.2 pyhd8ed1ab_0 conda-forge
pyyaml 6.0.2 py312h66e93f0_1 conda-forge
qhull 2020.2 h434a139_5 conda-forge
readline 8.2 h8228510_1 conda-forge
requests 2.32.3 pyhd8ed1ab_0 conda-forge
ruff 0.6.9 py312hd18ad41_0 conda-forge
scipy 1.14.1 py312h7d485d2_0 conda-forge
setuptools 75.1.0 pyhd8ed1ab_0 conda-forge
setuptools-scm 8.1.0 pyhd8ed1ab_0 conda-forge
setuptools_scm 8.1.0 hd8ed1ab_0 conda-forge
shapely 2.0.6 py312h391bc85_2 conda-forge
six 1.16.0 pyh6c4a22f_0 conda-forge
snappy 1.2.1 ha2e4443_0 conda-forge
snowballstemmer 2.2.0 pyhd8ed1ab_0 conda-forge
soupsieve 2.5 pyhd8ed1ab_1 conda-forge
sphinx 8.0.2 pyhd8ed1ab_0 conda-forge
sphinx-gallery 0.17.1 pyhd8ed1ab_0 conda-forge
sphinxcontrib-applehelp 2.0.0 pyhd8ed1ab_0 conda-forge
sphinxcontrib-devhelp 2.0.0 pyhd8ed1ab_0 conda-forge
sphinxcontrib-htmlhelp 2.1.0 pyhd8ed1ab_0 conda-forge
sphinxcontrib-jsmath 1.0.1 pyhd8ed1ab_0 conda-forge
sphinxcontrib-qthelp 2.0.0 pyhd8ed1ab_0 conda-forge
sphinxcontrib-serializinghtml 1.1.10 pyhd8ed1ab_0 conda-forge
sqlite 3.46.1 h9eae976_0 conda-forge
stack_data 0.6.2 pyhd8ed1ab_0 conda-forge
tk 8.6.13 noxft_h4845f30_101 conda-forge
tomli 2.0.2 pyhd8ed1ab_0 conda-forge
traitlets 5.14.3 pyhd8ed1ab_0 conda-forge
typing-extensions 4.12.2 hd8ed1ab_0 conda-forge
typing_extensions 4.12.2 pyha770c72_0 conda-forge
tzdata 2024b hc8b5060_0 conda-forge
ukkonen 1.0.1 py312h68727a3_5 conda-forge
urllib3 2.2.3 pyhd8ed1ab_0 conda-forge
virtualenv 20.26.6 pyhd8ed1ab_0 conda-forge
wcwidth 0.2.13 pyhd8ed1ab_0 conda-forge
wheel 0.44.0 pyhd8ed1ab_0 conda-forge
xarray 2024.9.0 pyhd8ed1ab_0 conda-forge
xorg-libxau 1.0.11 hb9d3cd8_1 conda-forge
xorg-libxdmcp 1.1.5 hb9d3cd8_0 conda-forge
xz 5.2.6 h166bdaf_0 conda-forge
yaml 0.2.5 h7f98852_2 conda-forge
zipp 3.20.2 pyhd8ed1ab_0 conda-forge
zlib 1.3.1 hb9d3cd8_2 conda-forge
zstandard 0.23.0 py312hef9b889_1 conda-forge
zstd 1.5.6 ha6fb4c9_0 conda-forge
