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Fix contours on global data plot #654

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Merged
brian-rose merged 4 commits into from
Jun 17, 2026
Merged

Fix contours on global data plot #654

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aecbc38
No data at the poles
brian-rose Jun 16, 2026
cd6230c
[pre-commit.ci] auto fixes from pre-commit.com hooks
pre-commit-ci[bot] Jun 16, 2026
1b386ca
Fix an oops
brian-rose Jun 16, 2026
389c244
Switch to Equal Earth (and add ref)
brian-rose Jun 17, 2026
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8 changes: 5 additions & 3 deletions core/cartopy/cartopy.ipynb
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Original file line number Diff line number Diff line change
Expand Up @@ -652,7 +652,9 @@
"source": [
"Plotting data on a Cartesian grid is equivalent to plotting data in the PlateCarree projection, where meridians and parallels are all straight lines with constant spacing. As a result of this simplicity, the global datasets we use often begin in the PlateCarree projection.\n",
"\n",
"Once we create our map again, we can plot these data values as a contour map. We must also specify the `transform` keyword argument. This is an argument to a contour-plotting method that specifies the projection type currently used by our data. The projection type specified by this argument will be transformed into the projection type specified in the `subplot` method. Let's plot our data in the Mollweide projection to see how shapes change under a transformation."
"Once we create our map again, we can plot these data values as a contour map. We must also specify the `transform` keyword argument. This is an argument to a contour-plotting method that specifies the projection type currently used by our data. The projection type specified by this argument will be transformed into the projection type specified in the `subplot` method. \n",
"\n",
"Let's plot our data in the Equal Earth global projection {cite:p}`10.1080/13658816.2018.1504949` to see how shapes change under a transformation."
]
},
{
Expand All @@ -662,7 +664,7 @@
"outputs": [],
"source": [
"fig = plt.figure(figsize=(11, 8.5))\n",
"ax = plt.subplot(1, 1, 1, projection=projMoll)\n",
"ax = plt.subplot(1, 1, 1, projection=ccrs.EqualEarth())\n",
"ax.coastlines()\n",
"dataplot = ax.contourf(lon, lat, data, transform=ccrs.PlateCarree())\n",
"plt.colorbar(dataplot, orientation='horizontal');"
Expand Down Expand Up @@ -742,7 +744,7 @@
"name": "python",
"nbconvert_exporter": "python",
"pygments_lexer": "ipython3",
"version": "3.14.3"
"version": "3.14.4"
}
},
"nbformat": 4,
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