[Qgis-user] Export WKT format
Junior Delaz
delazj at gmail.com
Mon Oct 20 12:34:59 PDT 2014
Hi,
I think the WKT issue is an OGR one :
https://trac.osgeo.org/gdal/ticket/5508
It should work in QGIS master
2014-10-20 20:31 GMT+02:00 Alex Mandel <tech_dev at wildintellect.com>:
> KML isn't a good choice, as it's always Lat/Lon WGS84.
> GML might work, but give GeoJson a shot first - it's simpler than GML to
> parse (actually little or no parsing required).
>
> Did you try ogr2ogr on the commandline to make sure it's not a bug in
> the QGIS writer for long lines?
>
> Thanks,
> Alex
>
> On 10/20/2014 11:11 AM, Andrew Gillett wrote:
> > I wrote my parser for WKT as it was the quickest and simplest format to
> > parse that I was aware of – I only need the country border data, and
> > could see how to parse this just by looking at the file, whereas other
> > formats would have needed more research.
> >
> > The problem is with exporting the WKT using a specified projection. At
> > the moment I have to export an intermediate format to get the projection
> > right, then load that back in and copy/paste for the WKT.
> >
> > I am now looking into using KML or GML instead.
> >
> >
> > On 20/10/2014 18:26, Alex Mandel wrote:
> >> That sounds like it's hitting some sort of line limit. Might be a bug in
> >> OGR. You could try writing WKT to a column first, but it would have to
> >> be in a layer type that supports long text fields.
> >>
> >> That said WKT is not a great format for complex geometries. Perhaps you
> >> can tell us your goal and we can suggest another way to get there.
> >>
> >> Thanks,
> >> Alex
> >>
> >> On 10/20/2014 10:21 AM, Andrew Gillett wrote:
> >>> Thanks for the info. I've just tried this and there appears to be a bug
> >>> in it. I'm using the country border data from here:
> >>>
> >>> http://www.naturalearthdata.com/downloads/10m-cultural-vectors/
> >>>
> >>> If, for example, I select Iceland and export as you suggested, the
> >>> column for the polygon data is truncated. Only about 200 vertices are
> >>> exported, as compared to around 3000 which are correctly present if I
> >>> use the copy/paste method. The polygon data ends with an X coordinate
> >>> but no Y coordinate, and the closing brackets and quote mark are also
> >>> missing.
> >>>
> >>>
> >>> On 20/10/2014 17:39, Matthias Kuhn wrote:
> >>>> Hi Andrew,
> >>>>
> >>>> WKT is a format for geometries and not a file type. Therefore it is
> not
> >>>> possible to offer a save as WKT just like that. You can however easily
> >>>> choose Comma Separated Value as export format and then choose AS_WKT
> in
> >>>> the Geometry combobox under layer options.
> >>>>
> >>>> Best regards,
> >>>> Matthias
> >>>>
> >>>>
> >>>> On 20.10.2014 18:35, Andrew Gillett wrote:
> >>>>> It is possible to export in WKT format by copying then pasting into a
> >>>>> text editor. However, there is no WKT option when exporting via Layer
> >>>>> -> Save As. Is there a particular reason for this, or is there a
> >>>>> development list where I could request this?
> >>>>> _______________________________________________
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>
>
> --
> Alex Mandel
> http://wildintellect.com
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