cartopy
cartopy copied to clipboard
Published
20 hours ago •
SciTools
SciTools
gridline labels repeated on sides of a limited view
Description
The left and right gridline labels for a geostationary projection are duplicated and misplaced.
Code to reproduce
import matplotlib
matplotlib.use('Agg')
import matplotlib.pyplot as plt
import cartopy.crs as crs
# This geostationary projection matches that of GOES 17.
proj_object = crs.Geostationary(central_longitude=-137.0, satellite_height=35786023.0, sweep_axis='x', )
bounding_axes = [-2505021.8, 2505021.8, 1583173.8, 4589200.0]
fig = plt.figure( )
axes = fig.add_subplot(111, projection=proj_object)
axes.set_extent(bounding_axes, crs=proj_object)
# draw some lat/lon gridlines
gl_obj = axes.gridlines(draw_labels=True,)
fig.savefig("./gridtest.png", )
plt.close(fig)
Traceback
(No error message is generated, only the faulty image output.)
Full environment definition
python 3.6.10
Operating system
MacOS 10.15.7
Cartopy version
cartopy 0.18.0
conda list
# packages in environment at /opt/anaconda3/envs/aitf_ql:
#
# Name Version Build Channel
_anaconda_depends 2020.02 py36_0
aitf-ql CSPP.ABI.Quicklooks.v0.7 dev_0 <develop>
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I tried tracking this down, but am coming up empty on a final solution. If you lower the Y extents about ~300-500k meters south then you don't get the same issue and you even get more longitude lines. With the original code I went into the cartopy Gridliner source code with pycharm's debugger and as far as I can tell there are indeed duplicate Label objects in the list. There are other Labels that are duplicated (they have the same text and are on the same side of the axes) but one of the duplicates is always set to invisible so it isn't a problem. I'm having trouble following the low-level logic that generates these Labels from the list of ticks. And to be clear, the list of ticks to generate is as expected (ex. [15.0, 20.0, 25.0, 30.0, 35.0, 40.0, 45.0, 50.0]) and does not include duplicates.
It has to happen somewhere in this logic which leads to the generation of "heads" and "tails" and then from there the generation of the labels:
https://github.com/SciTools/cartopy/blob/591fb5450e11b42b6de1cebe4f240112f915bd52/lib/cartopy/mpl/gridliner.py#L817-L830
Given this is the geostationary projection and includes points outside of the lon/lat space, my guess is cartopy is failing to check the bounds/overlaps/intersections between the graticule lines and the map bounding box.
