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The method background_img() currently displays background images at a lower resolution compared to the original files.
The issue is similar to #1708 and in fact I managed to solve it by modifing the source file adding the regrid_shape argument, set to 5000.
Below I report a test case and the output images, with and without the regrid_shape argument.
I think that it would be beneficial to add regrid_shape as optional argument to background_img().
Code to reproduce
import cartopy.crs as ccrs
import matplotlib
matplotlib.use('TKAgg')
import matplotlib.pyplot as plt
import os
import subprocess
import json
def get_bkg_image(url, fname):
command = ["curl", "-o", fname, url]
subprocess.run(command, check=True)
def write_json(fname):
# Data to be written
imgdict ={"TEST": {
"__comment__": "",
"__source__": "",
"__projection__": "PlateCarree",
"high": fname
}
}
# Serializing json
json_object = json.dumps(imgdict, indent=4)
# Writing to sample.json
with open("images.json", "w") as outfile:
outfile.write(json_object)
if __name__=='__main__':
# Download background image
url = "https://eoimages.gsfc.nasa.gov/images/imagerecords/73000/73826/world.topo.bathy.200410.3x5400x2700.jpg"
get_bkg_image(url, 'image.jpg')
# Write images.json
write_json('image.jpg')
# setup environment
os.environ["CARTOPY_USER_BACKGROUNDS"] = os.getcwd()
# setup projection and background_img
proj = ccrs.Stereographic(central_latitude=90.0, central_longitude=0.0)
ax = plt.axes(projection=proj)
ax.background_img(name='TEST', resolution='high', extent = ([-180, 180, 45, 90]))
ax.set_extent([-180, 180, 90, 60], ccrs.PlateCarree())
Description
The method
background_img()currently displays background images at a lower resolution compared to the original files.The issue is similar to #1708 and in fact I managed to solve it by modifing the source file adding the
regrid_shapeargument, set to 5000.Below I report a test case and the output images, with and without the regrid_shape argument.
I think that it would be beneficial to add
regrid_shapeas optional argument tobackground_img().Code to reproduce
Full environment definition
Operating system
Ubuntu 18.04.4 LTS on WSL
Cartopy version
0.23.0
conda list
pip list
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