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...
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