Hey Ryan,
On May 6, 2009, at 5:22 PM, Ryan Halterman wrote:
> Hello,
>
> I am trying to read NGA Digital Nautical Charts (VPF/VRF format)
> into Mapnik. To do so, I am attempting to create a datasource using
> the OGDI driver through the ogr plugin. I have built Mapnik in
> Ubuntu 8.10 (and 9.04) with debug on and with ogr support. Upon
> importing Mapnik, I receive confirmation of the ogr plugin's
> existence. I am able to run ogrinfo on the DNC data source and
> receive a list of layers using the following command:
>
> ogrinfo gltp:/vrf/home/<user>/dnc/dnc13/a1316120
Fascinating - i've never heard of this file format.
>
>
> One of the layers listed is:
>
> 11: coa...@ecr(*)_line (Line String)
>
> In order to create the data source in Mapnik, I am attempting the
> following:
>
> lyr = mapnik.Layer('test', "+proj=latlong +datum=WGS84")
> lyr.datasource = mapnik.Ogr(file='/home/<user>/dnc/dnc13/
> a1316120', layer='coa...@ecr(*)_line')
>
> This gives a runtime error indicating line 299 in mapnik/
> __init__.py (return CreateDatasource(keywords))
>
What is the full error?
Maybe try:
lyr.datasource = mapnik.Ogr(file='gltp:/vrf/home/<user>/dnc/dnc13/
a1316120', layer='coa...@ecr(*)_line')
> Without being at all certain of its correctness, I also attempted to
> call CreateDatasource directly with the following:
>
This will be no different that calling the Ogr function, which just
wraps CreateDatasource.
> lyr.datasource = mapnik.CreateDatasource(type='ogr', file=/home/
> <user>/dnc/dnc13/a1316120', layer='coa...@ecr(*)_line')
>
Looks like you are missing a single quote after 'file'
> This returns the following:
> ArgumentError: Python argument types in
> mapnik._mapnik.CreateDatasource() did not match C++ signature:
> CreateDatasource(boost::python::dict)
>
> I am able to use ogr2ogr to convert the DNC to a shapefile and then
> import that into Mapnik, but I would greatly prefer to not have to
> go through that step. Any suggestions or insight anyone may have
> about this or reading Digital Nautical Charts in general would be
> appreciated.
>
> -- Ryan
>
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