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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