[Qgis-user] Export WKT format

[Alex Mandel]

That was my suspicion. Though since it's an OGR issue, you just need a
newer GDAL/OGR not necessarily newer QGIS.

Updating just GDAL/OGR depends on your operating system but should be
possible on most systems.

Thanks,
Alex

On 10/20/2014 12:34 PM, Junior Delaz wrote:
> 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