[postgis-users] FileGDB curves

[Rémi Cura]

Good, you narrowed the error.

The function would do it for you,
it would convert the curved parts into curves and the straight part into
segment,
forming a curved polygon, which is a set of curve and segments.

But I'm affraid your line must appoximate the curves to have a result.
Your 2 first screen shots indicate that the curve information is simply
gone.

You can manually approximate curves into line in arcgis before export,
or maybe OGR driver for arcgis support curves
(http://www.gdal.org/drv_filegdb.html)

Cheers,
Rémi-C



2014-11-12 15:56 GMT+01:00 Andy Colson <andy at squeakycode.net>:

> Mapserver displays it the same way:
>
> http://testmaps.camavision.com/map/washingtonmn?pin=16.028.21.11.0039
>
> The data looks like:
>
> gis=# select st_AsText(the_geom) from streets where gid = 11517;
> -[ RECORD 1 ]-----------------------------------------------------------
> ------------------------------------------------------------
> ------------------------------------------------------------
> ------------------------------------------------------------
> ------------------------------------------------------------
> -------------------------------
> st_astext | MULTILINESTRING((-10344354.4038468 5608573.22422463,-10344363.9860388
> 5608565.68874797,-10344398.9885982 5608528.81799097,-10344438.5518419
> 5608468.68094317,-10344404.2129173 5608265.5414558,-10344355.0291817
> 5608227.92219317,-10344239.0250123 5608196.3261761,-10344230.7760714
> 5608197.59004929,-10344187.3835781 5608212.14184435))
>
>
>
> So I'm assuming that its a convert problem, not a display problem.
>
> I'm not sure how to use ST_LineToCurve.  This is a road layer and
> everything is a MULTILINESTRING, I can't tell the straight from the
> curves.  Can I?
>
> Thanks,
>
> -Andy
>
>
>
> On 11/12/2014 3:58 AM, Rémi Cura wrote:
>
>> Hey,
>> first qgis can't deal with curve (i think),
>> so your data may be curved in your postgis but the visualisation would
>> be incorrect
>>   so if you are going to see some curve in qgis, you have to convert the
>> curve to approximate theim using
>> http://postgis.net/docs/ST_CurveToLine.html,
>> then display the geom
>> (you can do this in a view if you don't want to duplicate data)
>>
>> Now if you are really really sure that data in postgis is bad (use
>> ST_AsTExt(geom) for example to see if anything look like curve)
>> Either you approximate your curve with multiline and convert it back to
>> curve with postgis
>> (http://postgis.net/docs/ST_LineToCurve.html)
>>
>> Or you have to go the long way and pass the curves as attributes, and
>> reconstruct it afterward.
>> This seems like a very bad idea.
>>
>> I'm afraid curve support is very very limited in all gis tools.
>>
>> Cheers,
>> Rémi-C
>>
>> 2014-11-12 0:00 GMT+01:00 Andy Colson <andy at squeakycode.net
>> <mailto:andy at squeakycode.net>>:
>>
>>     Hi All,
>>
>>     Not sure where the best place to ask this, so I'll start here.
>>
>>     I have a FileGDB that contains some curved lines, I import it into
>>     PostGIS and they come out as chopped off Multiline.
>>
>>     Here are some screen shots to help explain:
>>
>>     Here is arc viewing the .gdb:
>>     http://testmaps.camavision.__com/arc.png
>>     <http://testmaps.camavision.com/arc.png>
>>
>>     Here is qgis viewing PostGIS:
>>     http://testmaps.camavision.__com/qgis.png
>>     <http://testmaps.camavision.com/qgis.png>
>>
>>
>>     I tried to get arcCatalog to export to shapefile, but something went
>>     bad and I cannot even look at the .shp files.
>>
>>     Any hints how I can get the curve back?
>>
>>     Thanks for your time,
>>
>>     -Andy
>>
>
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