CODEWITHSUNDEEP
pythonanacondacondagdal
m00saca
m00saca

Reputation: 363

Trouble importing GDAL and ogr using Jyupter Notebook

I am working on a school project doing some spatial analysis on of counties in California; using Jyupter Notebook to run Python(2.7) scripts and create visualizations.

I was successful in importing Basemap into my notebook after I downloaded it using conda. I am very new to Python and can't really remember how I pulled that off. I believe I used the instructions from this website.

But now, when trying to impose my shapefile over the basemap I run into this error:

ValueError: shapefile must have lat/lon vertices  - it looks like this one has vertices in map projection coordinates. You can convert the shapefile to geographic
coordinates using the shpproj utility from the shapelib tools
(http://shapelib.maptools.org/shapelib-tools.html)

For the past hour I have been searching for ways to convert the coordinates and learned about GDAL and some command ogr2ogr. I have tried following the instructions posted on gdal.org that tell me to run this command: conda install -c conda-forge gdal. Is there a difference between conda and conda-forge? I have tried many variations of this command like: conda install -c anaconda2 gdal and install conda gdal. Nothing has worked because when I go back to my notebook and try import gdal or import ogr I get an error like so:

ImportError: dlopen(/anaconda2/lib/python2.7/site-packages/osgeo/_gdal.so, 2): Library not loaded: @rpath/libgif.7.dylib
  Referenced from: /anaconda2/lib/libgdal.20.dylib
  Reason: image not found

I'm really confused as to how conda works, the difference between conda and conda-forge, and where all this stuff I have been downloading has been going. What I am doing wrong?

Upvotes: 0

Views: 1054

Answers (1)

Simba
Simba

Reputation: 27718

First, when you ask a question, please specify your environment: OS, conda version (conda info), Python version, etc.

What is a channel

conda is a Python environment manager and a package manager. To install packages, conda has to download the packages from somewhere. The place where conda get the list of packages is called a channel.

By defaults, two channels named main and r are enable, both of which are maintained by Anaconda, the company itself. conda-force is a channel by a third-party community.

Quote from conda-force documentation

What is conda-forge?

conda-forge is a community effort that provides conda packages for a wide range of software.

Specify a channel in command line with -c channelname, shortcut for --channel.

How to fix your problem

Your problem was caused by a mixed channel usage for one package. gdal was specified to be installed from conda-forge, but not its dependencies. Since channel of its dependencies are not specified, the default channel main and r will be used.

To fix the mixed dependency use, enable "strict" channel priority.

conda config --set channel_priority strict

which makes channel specified by --channel prioritize over other channels.

channel_priority (ChannelPriority)

With strict channel priority, packages in lower priority channels are not considered if a package with the same name appears in a higher priority channel.

Then recreate an environment and install gdal.

conda create --name test4gdal python=2.7
conda activate test4gdal
conda install -c conda-forge gdal

This time, all gdal related packages are installed from conda-forge.

References

Upvotes: 3

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