ValueError: 'vertices' must be 2D with shape (N, 2), but your input has shape (0,)

[FlorianSuzat]

Description

since version 0.24 (commit 8bb65fbd259a1cfbd6f90c9716daf413ef31e965), I encounter a problem with cartopy. Here is the traceback.

Traceback

Traceback (most recent call last):
  File "/home/gmap/mrpa/suzat/tmp/toto.py", line 6, in <module>
    fig.savefig('toto.png')
  File "#PATH#/matplotlib/figure.py", line 3395, in savefig
    self.canvas.print_figure(fname, **kwargs)
  File "#PATH#/matplotlib/backend_bases.py", line 2204, in print_figure
    result = print_method(
  File "#PATH#/matplotlib/backend_bases.py", line 2054, in <lambda>
    print_method = functools.wraps(meth)(lambda *args, **kwargs: meth(
  File "#PATH#/matplotlib/backends/backend_agg.py", line 496, in print_png
    self._print_pil(filename_or_obj, "png", pil_kwargs, metadata)
  File "#PATH#/matplotlib/backends/backend_agg.py", line 444, in _print_pil
    FigureCanvasAgg.draw(self)
  File "#PATH#/matplotlib/backends/backend_agg.py", line 387, in draw
    self.figure.draw(self.renderer)
  File "#PATH#/matplotlib/artist.py", line 95, in draw_wrapper
    result = draw(artist, renderer, *args, **kwargs)
  File "#PATH#/matplotlib/artist.py", line 72, in draw_wrapper
    return draw(artist, renderer)
  File "#PATH#/matplotlib/figure.py", line 3162, in draw
    mimage._draw_list_compositing_images(
  File "#PATH#/matplotlib/image.py", line 132, in _draw_list_compositing_images
    a.draw(renderer)
  File "#PATH#/matplotlib/artist.py", line 72, in draw_wrapper
    return draw(artist, renderer)
  File "#PATH#/cartopy/mpl/geoaxes.py", line 511, in draw
    self._draw_preprocess()
  File "#PATH#/cartopy/mpl/geoaxes.py", line 487, in _draw_preprocess
    self.patch._adjust_location()
  File "#PATH#/cartopy/mpl/geoaxes.py", line 240, in _adjust_location
    cpatch._ensure_path_closed(
  File "#PATH#/cartopy/mpl/patch.py", line 49, in _ensure_path_closed
    return Path(vertices, codes)
  File "#PATH#/matplotlib/path.py", line 130, in __init__
    _api.check_shape((None, 2), vertices=vertices)
  File "#PATH#/matplotlib/_api/__init__.py", line 161, in check_shape
    raise ValueError(
ValueError: 'vertices' must be 2D with shape (N, 2), but your input has shape (0,)

Here some useful prints...

#PATH#/cartopy/mpl/geoaxes.py 237 viewLim Bbox(x0=-772850.0000000698, y0=-772850.0000000224, x1=787149.9999999468, y1=787149.9999999979)
#PATH#/cartopy/mpl/geoaxes.py 238 _original_path.clip_to_bbox Path(array([], shape=(0, 2), dtype=float64), None)

I'm not expert in matplolib/cartopy stuff, so not able to be sure of the real source of the problem, and how to fix it... Any help will be appreciated...

Operating system

linux

Cartopy version

0.24

pip list

pip list
Package Version

---

asttokens 2.4.1
attrs 24.2.0
bcrypt 4.2.0
bronx 2.0.0
Cartopy 0.24.1
certifi 2024.8.30
cffi 1.17.1
cftime 1.6.4
charset-normalizer 3.4.0
contourpy 1.3.1
cryptography 43.0.3
ctypesForFortran 1.1.3
cycler 0.12.1
decorator 5.1.1
eccodes 1.7.1
epygram 1.5.2
exceptiongroup 1.2.2
executing 2.1.0
findlibs 0.0.5
fonttools 4.55.1
footprints 2.0.0
futures 3.0.5
h5py 3.12.1
idna 3.10
ipython 8.29.0
jedi 0.19.1
Jinja2 3.1.4
kiwisolver 1.4.7
MarkupSafe 3.0.1
matplotlib 3.9.3
matplotlib-inline 0.1.7
netCDF4 1.7.1.post2
numpy 2.1.3
packaging 24.2
panda 0.3.1
pandas 2.2.3
paramiko 3.5.0
parso 0.8.4
pexpect 4.9.0
pillow 11.0.0
pip 24.2
prompt_toolkit 3.0.48
ptyprocess 0.7.0
pure_eval 0.2.3
pycparser 2.22
Pygments 2.18.0
PyNaCl 1.5.0
pyparsing 3.2.0
pyproj 3.7.0
pyshp 2.3.1
python-dateutil 2.9.0.post0
pytz 2024.2
PyYAML 6.0.2
requests 2.32.3
setuptools 75.6.0
setuptools-scm 8.1.0
shapely 2.0.6
six 1.16.0
stack-data 0.6.3
tomli 2.2.1
traitlets 5.14.3
typing_extensions 4.12.2
tzdata 2024.2
urllib3 2.2.3
wcwidth 0.2.13

[rcomer]

Hello @FlorianSuzat, please could you provide a code example that we can run to reproduce the problem? We cannot debug anything that we cannot reproduce.

[rcomer]

The commit you referenced was not included in v0.24.

[FlorianSuzat]

Hi, sorry for late answer. I have got this problem inside a graphical package called epygram that uses cartopy plot backend. I'm not currently able to reproduce the problem outside this. For the commit I mentionned, it is an error using git blame. I will try to reproduce it in a ideal test case then I send it here