GeoDjango on Windows: “Could not find the GDAL library” / “OSError: [WinError 126] The specified module could not be found”

问题

I've been trying to setup my windows computer such that I can have a local postgreSQL with PostGIS extension. With this installed I hope to be able to create a project with geodjango locally before putting it in the cloud. I have been working with Django for a little while now on my local machine with the SQLite DB, but since the next project will partly be based on coordinate based data I wanted to setup the right environment.

Import note: I've installed mini-conda to run in a seperate environment. I do activate this environment "development" when I work though

I've tried to follow most of the geodjango information/tutorials online, but can't get it to work. What I've done (mostly followed this: https://docs.djangoproject.com/en/2.0/ref/contrib/gis/install/#windows):

Download and install the latest (10.3) PostgreSQL setup from https://www.enterprisedb.com/downloads/postgres-postgresql-downloads
After installation I also installed used the Application Stack Builder to install PostGis
I've installed OSGeo4W from https://trac.osgeo.org/osgeo4w/
I've created a batch script as described on the geodjango website (https://docs.djangoproject.com/en/2.0/ref/contrib/gis/install/#windows) and ran it as administrator (except for the part where it sets the path to python, cause python was already in there since I've been using python for a while now)
I've tried some command in psql shell and I think I've created a database with name: geodjango, username: **** and pass: ****.
I don't know if I have given the geodjango user all priveleges, but I suspect so.

After all of this I created a new django project and in settings.py I've added some parts:

INSTALLED_APPS = [
'django.contrib.admin',
'django.contrib.auth',
'django.contrib.contenttypes',
'django.contrib.sessions',
'django.contrib.messages',
'django.contrib.staticfiles',
'django.contrib.gis',
'nameOfMyApp',
]

I've also got this in settings.py:

DATABASES = {
'default': {
    'ENGINE': 'django.contrib.gis.db.backends.postgis',
    'NAME': 'geodjango',
    'USER': '****',
    'PASSWORD': '****',
    'HOST': 'localhost',
}
}

# FOR GEODJANGO
POSTGIS_VERSION = (2, 4, 3)

When I try to set up the database in django I run (in the right folder):

python manage.py makemigrations

I get the following error:

django.core.exceptions.ImproperlyConfigured: Could not find the GDAL library (tried "gdal202", "gdal201", "gdal20", "gdal111", "gdal110", "gdal19"). Is GDAL installed? If it is, try setting GDAL_LIBRARY_PATH in your settings.

I've tried to fix that, but nothing seems to work. Can anybody give me some help in setting this all up locally?

Update 7-3-2018:

I've tried installing GDAL manually myself, (from: http://www.gisinternals.com/query.html?content=filelist&file=release-1911-x64-gdal-2-2-3-mapserver-7-0-7.zip the generic core components)
I've installed (what I assume are) the python bindings from https://www.lfd.uci.edu/~gohlke/pythonlibs/. Still I get the same error.
I've also tried setting the GDAL_LIBRARY_PATH to the GDAL directory or the gdal-data directory (which resides in the GDAL directory).

Now I get the following error:

OSError: [WinError 126] The specified module could not be found

(while the .dll is there...)

回答1:

I have found the following to work for windows:

Run python to check if your python is 32 or 64 bit.
Install corresponding OSGeo4W (32 or 64 bit) into C:\OSGeo4W or C:\OSGeo4W64:
- Note: Select Express Web-GIS Install and click next.
- In the ‘Select Packages’ list, ensure that GDAL is selected; MapServer and Apache are also enabled by default, may be unchecked safely.

Make sure the following is included in your settings.py:

import os
if os.name == 'nt':
    import platform
    OSGEO4W = r"C:\OSGeo4W"
    if '64' in platform.architecture()[0]:
        OSGEO4W += "64"
    assert os.path.isdir(OSGEO4W), "Directory does not exist: " + OSGEO4W
    os.environ['OSGEO4W_ROOT'] = OSGEO4W
    os.environ['GDAL_DATA'] = OSGEO4W + r"\share\gdal"
    os.environ['PROJ_LIB'] = OSGEO4W + r"\share\proj"
    os.environ['PATH'] = OSGEO4W + r"\bin;" + os.environ['PATH']

Run python manage.py check to verify geodjango is working correctly.

回答2:

In my case (Windows10Pro+Python3.7.1), having the (automatically chosen) dll present was not enough, namely gdal111.dll.

I realized that I also had gdal204.dll located at C:\OSGeo4W\bin and tried to "enrich" the list variable named lib_names with 'gdal204', at line 24 (regarding Windows NT shared libraries) of %PYTHON_ROOT%\Lib\site-packages\django\contrib\gis\gdal\libgdal.py, i.e.

#[...]
elif os.name == 'nt':
    # Windows NT shared libraries
    lib_names = ['gdal204', 'gdal202', 'gdal201', 'gdal20', 'gdal111', 'gdal110', 'gdal19']
#[...]            ^^^^^^^

No negative consequences for now.

回答3:

For Microsoft Windows 10 & Python3.6.8, I installed GDAL 2.3.3 from Unofficial Windows Binaries for Python Extension Packages, modified libgdal.py adding gdal203 in the lib_names list env\Lib\site-packages\django\contrib\gis\gdal\libgdal.py.

Finally, added osgeo and proj to the PATH, and set the GDAL_LIBRARY_PATH as below (beginning of settings.py):

os.environ['PATH'] = os.path.join(BASE_DIR, r'env\Lib\site-packages\osgeo') + ';' + os.environ['PATH']

os.environ['PROJ_LIB'] = os.path.join(BASE_DIR, r'env3\Lib\site-packages\osgeo\data\proj') + ';' + os.environ['PATH']

GDAL_LIBRARY_PATH = os.path.join(BASE_DIR, r'env\Lib\site-packages\osgeo\gdal203.dll')

In this case, env is my Python environment.

来源：https://stackoverflow.com/questions/49139044/geodjango-on-windows-could-not-find-the-gdal-library-oserror-winerror-12

标签

python

django

postgresql

PostGIS

geodjango