ok, now I got it. I had GDAL_DATA set pointing to two different directories: for a PostgreSQL/PostGIS installation which had been set automatically and separate GDAL installation which I had set manually. Removed one of them and everything works as expected.
All the best, Tõnis 2015-01-02 9:05 GMT+02:00 tõnis kärdi <tonis.ka...@gmail.com>: > Thanks Sean, > > Yes, it looks like somewhere along the line my GDAL_DATA environment > variable is lost. As soon as I pass the path to a dgn seed-file in the > creation options everything just magically works. I guess it's a windows > wonderland thing. > > Cheerio and a Happy new year! > Tõnis > > 2014-12-31 22:02 GMT+02:00 Sean Gillies <sean.gill...@gmail.com>: > >> Hi Tõnis, >> >> I don't have much experience with DGN files, but it looks like there are >> a bunch of limitations and caveats listed at >> http://www.gdal.org/drv_dgn.html. The "seed file" in particular looks >> like something to investigate. Remember that creation options can be passed >> into fiona.open as kwargs like >> >> with fiona.open('example.dgn', 'w', driver='DGN', schema=schema, >> crs=crs, seed='seed.dgn') as dst: >> ... >> >> Hope this helps, and happy new year! >> >> On Wed, Dec 31, 2014 at 12:01 AM, tõnis kärdi <tonis.ka...@gmail.com> >> wrote: >>> >>> Hi, >>> >>> I can't seem to get writing dgn files with fiona to work - it results in >>> "ValueError: Null layer". The same script works fine for writing shapefiles >>> and MI tabs. >>> I managed to create a DGN file using QGIS and then read it using fiona. >>> I don't know much about CAD files in general so I'm sure there's something >>> I've missed totally, any pointers much appreciated. >>> >>> Here's how it goes: >>> >>> C:\>ogr2ogr --version >>> GDAL 1.11.0, released 2014/04/16 >>> C:\>python >>> Python 2.7.5 (default, May 15 2013, 22:44:16) [MSC v.1500 64 bit >>> (AMD64)] on win32 >>> Type "help", "copyright", "credits" or "license" for more information. >>> >>> import fiona >>> >>> print fiona.__version__ >>> 1.1.6 >>> >>> >>> >>> schema and properties read from the file created in QGIS >>> except for schema['geometry'] which was set manually to LineString >>> as fiona reports it as 'Unknown' when reading: >>> >>> >>> schema = {'geometry': 'LineString', 'properties': >>> fiona.OrderedDict([(u'Type', 'int:2'), (u'Level', 'int:2'), >>> (u'GraphicGroup', 'int:4'), (u'ColorIndex', 'int:3'), (u'Weight', 'int:2'), >>> (u'Style', 'int:1'), (u'EntityNum', 'int'), (u'MSLink', 'int'), (u'Text', >>> 'str')])} >>> >>> properties = {u'Style': 0, u'ColorIndex': 0, u'Weight': 0, u'Level': >>> 0, u'Text': None, u'MSLink': None, u'GraphicGroup': 0, u'EntityNum': None, >>> u'Type': 14} >>> >>> crs = {'lon_0': 24, 'no_defs': True, 'x_0': 500000, 'lat_2': 58, >>> 'lat_1': 59.33333333333334, 'towgs84': '0,0,0,0,0,0,0', 'ellps': 'GRS80', >>> 'y_0': 6375000, 'proj': 'lcc', 'units': 'm', 'lat_0': 57.51755393055556} >>> >>> >>> >>> [...] >>> >>> >>> with fiona.open( >>> ... 'd:/tmp/nna.dgn', >>> ... 'w', >>> ... 'DGN', >>> ... schema=schema, >>> ... crs=crs) as sink: >>> ... sink.write( >>> ... {'geometry': { >>> ... 'type': 'LineString', >>> ... 'coordinates': [ >>> ... [658513.3899922734, 6475203.499964565], >>> ... [658467.8400262331, 6475236.229952499], >>> ... [658486.4300012367, 6475258.259991983], >>> ... [658528.96998106, 6475228.000044374], >>> ... [658513.3899922734, 6475203.499964565]] >>> ... }, >>> ... 'type': 'Feature', >>> ... 'properties': properties}) >>> ... >>> >>> Traceback (most recent call last): >>> File "<stdin>", line 1, in <module> >>> with fiona.open('d:/tmp/nna.dgn', 'w', 'DGN', schema=schema, >>> crs=crs) as sink: >>> File "C:\Python27\lib\site-packages\fiona\__init__.py", line 156, in >>> open >>> encoding=encoding, layer=layer, vsi=vsi, archive=archive) >>> File "C:\Python27\lib\site-packages\fiona\collection.py", line 132, in >>> __init__ >>> self.session.start(self, **kwargs) >>> File "ogrext.pyx", line 960, in fiona.ogrext.WritingSession.start >>> (src/fiona/ogrext.c:15730) >>> ValueError: Null layer >>> >>> >>> >>> All the best, >>> Tõnis >>> >>> p.s. tried writing DGN also using osgeo.ogr. For whatever reason the >>> .CreateLayer(...) method always returns None... >>> >>> _______________________________________________ >>> Community mailing list >>> Community@lists.gispython.org >>> http://lists.gispython.org/mailman/listinfo/community >>> >>> >> >> -- >> Sean Gillies >> >> _______________________________________________ >> Community mailing list >> Community@lists.gispython.org >> http://lists.gispython.org/mailman/listinfo/community >> >> > >
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