JYP's map room

You will find below a gallery of maps made with matplotlib and cartopy

Be sure to also have at least a quick look at the examples available in the Cartopy Gallery!

You can get more python information on the JYP's recommended steps for learning python page.

This page is under construction and its content may change drastically. The source codes are on LSCE servers, that you can hopefully access (too bad otherwise…)

• Summary: plot two PFT maps on a page
• Authors: Camille Contoux & Jean-Yves Peterschmitt
• Date: September 2019
• Script: ~jypeter/CDAT/Progs/Devel/contoux/plot_PFT_plio_pi.py

• Load the NetCDF model data with cdms2
• Optionally reduce the number of PFTs before plotting
• Use matplotlib+cartopy to create the plot
  • Create two plots with a PlateCarree projection and a common colorbar
  • Use an A4 portrait (figsize=(8.3, 11.7)) figure size and subplots_adjust in order to improve the page layout
  • Use a listed colormap (and the associated norm), and pcolormesh to plot the discrete PFT values
  • Use a trick to make sure that the black plot border is correctly plotted above everything (top_plot.outline_patch.set_zorder(50)). Note: the plot border problem in cartopy 0.17.0 has been fixed in a future version of cartopy and the outline_patch trick will not be required at some point

• Summary: Plot two megabiome maps based on 2 versions of the IPSL model (CM5 and CM6), and compare them to a map with observations
• Authors: Raj Rani & Jean-Yves Peterschmitt
• Date: September 2019
• Script: ~jypeter/CDAT/Progs/Devel/pasb/PMIP4/Press_Conference_1909/mh_CM6_CM5_megabiome.py

• Load the NetCDF model data with cdms2, and the csv observations' data with pandas
• Use matplotlib+cartopy to create the plot
  • Create three plots on a 2×2 layout with an Orthographic projection (centered on Europe) and a common colorbar. Explicitly make the 4th plot invisible in order to make space for plotting the colorbar (colorbar_plot.background_patch.set_visible(False) and colorbar_plot.outline_patch.set_visible(False))
  • Use a square (figsize=(8, 8)) figure size in order to improve the page layout
  • Use the same color scale for both the model data (plotted with pcolormesh) and the observation data (plotted with scatter)
  • Use a dictionary trick for easily using the same gridlines parameters for all the maps
  • Use a common listed colormap to plot the discrete megabiome values (with a norm associated with the megabiome values) and the observations (with a different norm associated with the observations)
  • The three plots have the same colormap, but we create a standalone colormap (created with mpl.colorbar.ColorbarBase) in the Bottom Left quadrant. We use UR_plot.get_position().bounds to determine the exact location of the Upper Right and Lower Left plots, and combine the coordinates to create the axis (with my_page.add_axes) where the colorbar will be plotted

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