CODEWITHSUNDEEP
offlinecartopy
sameagol
sameagol

Reputation: 633

Use Cartopy Maps Offline

I am trying to plot maps using Cartopy offline. I've found this post: Location of stored offline data for cartopy However, after changing cartopy.config['data_dir'] to 'C:/...' where the downloaded files are located, when I try to draw coastlines, it still wants to download the map.

cartopy.config['data_dir'] = '.../CartopyMaps'
ax = plt.axes(projection=ccrs.PlateCarree())
ax.coastlines()

The console says :

Downloading: 
http://naciscdn.org/naturalearth/110m/physical/ne_110m_coastline.zip

However, I have ne_110m_coastline dbf, shp, and shx files in .../CartopyMaps/shapefiles/natural_earth/physical/

Why does Cartopy not see my local maps and how can I help it?

Upvotes: 4

Views: 4079

Answers (3)

Andrew
Andrew

Reputation: 537

I shared a step by step solution here: https://discourse.holoviz.org/t/using-geoviews-tile-sources-offline/4859/5

TLDR:

import cartopy
import geoviews as gv
from bokeh.resources import INLINE

cartopy.config["pre_existing_data_dir"] = "/Users/ahuang/.cartopy/cartopy"
print(cartopy.config)

gv.extension("bokeh")

coastline = gv.feature.coastline()
borders = gv.feature.borders()
world = (coastline * borders).opts(global_extent=True)

gv.save(world, "world.html", resources=INLINE)

Upvotes: 0

Gatsby
Gatsby

Reputation: 1

i had the similar problem and was confused for quite a while. after i downloaded the whole offline dataset and put them in the right dir, after runing the code

...
states = NaturalEarthFeature(category="cultural", scale="50m",
                             facecolor="none",
                             name="admin_1_states_provinces_shp")
...

the console still says:

Downloading: 
...50m/cultural/ne_50m_admin_1_states_provinces_lines_shp.zip

however, i found there is a slight difference between the file ne_50m_admin_1_states_provinces_lines.shp i downloaded and the file ne_50m_admin_1_states_provinces_lines_shp.zip cartopy tries to acquire ('_shp').

therefore i changed the command into this and it worked:

states = NaturalEarthFeature(category="cultural", scale="50m",
                             facecolor="none",
                             name="admin_1_states_provinces")

Upvotes: 0

user2855135
user2855135

Reputation: 85

Try using the "pre_existing_data_dir" path instead of the "data_dir". 

from os.path import expanduser
import cartopy
cartopy.config['pre_existing_data_dir'] = expanduser('~/cartopy-data/')

Upvotes: 0

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