I'm a newbie to making/plotting on maps with python, been trying to follow this blogpost to generate a world map ( http://sciblogs.co.nz/seeing-data/2011/08/12/plotting-geographic-data-on-a-world-map-with-python/ ). Got stuck with a few things here:
Installing Basemap (a Matplotlib extension for plotting data on geographic projections).
from mpl_toolkits.basemap import Basemap
Traceback (most recent call last):
File "geos_demo.py", line 1, in <module>
from mpl_toolkits.basemap import Basemap
ImportError: No module named mpl_toolkits.basemap
Install Shapely, but the following error occurs [1]:
Then I went into the geos.py file and change all the references of geos.dll to geos_c.dll, as recommended by the link here: http://osgeo-org.1560.n6.nabble.com/osgeo4w-258-Problems-with-python-shapely-python-2-7-2-td4336816.html
However, the same error [1] occurs.
I'm using Python 2.7.1 and Mac OS 10.7.4. Please let me know if I can provide additional information, and really appreciate any guidance from the community here! Thanks!
[1]
from shapely.geometry import Point
Traceback (most recent call last): File "<stdin>", line 1, in <module>
File "/Users/Desktop/python/ENV/lib/python2.7/site-packages/shapely/geometry/__init__.py", line 4, in <module>
from geo import box, shape, asShape, mapping
File "/Users/Desktop/python/ENV/lib/python2.7/site-packages/shapely/geometry/geo.py", line 5, in <module>
from point import Point, asPoint
File "/Users/Desktop/python/ENV/lib/python2.7/site-packages/shapely/geometry/point.py", line 7, in <module>
from shapely.coords import required
File "/Users/Desktop/python/ENV/lib/python2.7/site-packages/shapely/coords.py", line 8, in <module>
from shapely.geos import lgeos
File "/Users/Desktop/python/ENV/lib/python2.7/site-packages/shapely/geos.py", line 59, in <module>
_lgeos = load_dll('geos_c', fallbacks=alt_paths)
File "/Users/Desktop/python/ENV/lib/python2.7/site-packages/shapely/geos.py", line 44, in load_dll
libname, fallbacks or []))
OSError: Could not find library geos_c or load any of its variants ['/Library/Frameworks/GEOS.framework/Versions/Current/GEOS', '/opt/local/lib/libgeos_c.dylib']
For questions 2-4, you have to have GEOS installed on your system. If you have homebrew you can do the following:
brew install geos
Install homebrew here if you don't have it: Link
On Ubuntu, to install GEOS
, this worked for me:
$ sudo apt-get install libgeos-dev
With OS X 10.11 (El Capitan) and Boxen, I had do do this:
brew install geos
sudo mkdir /opt/local
sudo ln -s /opt/boxen/homebrew/lib /opt/local/lib
to let Shapely find libgeos_c.dylib
in one of the locations it was willing to look for it.
The problem seems to be that you haven't actually installed the required modules.
Lines of Python code like
from mpl_toolkits.basemap import Basemap
Are import statements that tell your script to use modules (or other bits of Python code) that you need to have already installed.
For each of the packages mentioned (NumPy, Matplotlib, Basemap) you will have to figure out how to install them on your system. In the case of NumPy and Matplotlib this can be complicated because they require compilation. For instance these are theNumpy instructions.
If you just wanted to try playing with the instructions in that blog post then you could use a service like PythonAnywhere which has numpy, matplotlib, and basemap installed already. (disclaimer, I work on PythonAnywhere...)
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