wfs json output, coordinates order problem

[sige]

Hi,

I tried to get wfs feature data from:
http://sigma.openplans.org/geoserver/wfs?request=GetFeature&typename=topp:tasmania_cities&outputformat=json&maxfeatures=10

and display the layer on:
http://openlayers.org/dev/examples/vector-formats.html

and the positions of the features don't look correct.

I found the order of the lat/lon in the coordinates element:
{"coordinates":[lat, lon]} is different from that in the geojson specification which is: {"coordinates":[lon,lat]}(http://geojson.org/geojson-spec.html#positions).

Is there a way of changing the coordinates order?

Thanks,

Sige

[Rahkonen Jukka]

Hi,

Have you tried what happens with WFS 1.0.0? Add &service=wfs&version=1.0.0 to your request. It may help. Without version the default is the highest WFS version supported by the server.

-Jukka Rahkonen-



sige wrote:

Hi,

I tried to get wfs feature data from:
http://sigma.openplans.org/geoserver/wfs?request=GetFeature&typename=topp:tasmania_cities&outputformat=json&maxfeatures=10

and display the layer on:
http://openlayers.org/dev/examples/vector-formats.html

and the positions of the features don't look correct.

I found the order of the lat/lon in the coordinates element:
{\coordinates\:[lat,lon]} is different from that in the geojson
specification which is:
{\coordinates\:[lat,lon]}(http://geojson.org/geojson-spec.html#positions).

Is there a way of changing the coordinates order?

Thanks,

Sige
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[sige]

Yes, it works. Does this mean that OpenLayers doesn't support the he highest WFS version for GeoJson?

Thanks a lot!

Sige

Rahkonen Jukka wrote:

Hi,

Have you tried what happens with WFS 1.0.0? Add &service=wfs&version=1.0.0 to your request. It may help. Without version the default is the highest WFS version supported by the server.

-Jukka Rahkonen-



sige wrote:

[Andrea Aime-4]

sige ha scritto:
> Yes, it works. Does this mean that OpenLayers doesn't support the he highest
> WFS version for GeoJson?

Things are kind of tricky here.
The WFS 1.1 protocol mandates lat/lon order for any geographic
coordinate system (this statement is actually a simplification, but most
of the time it's correct).

Now, GML3 capable clients should know about this and deal with the
ordinates order properly.
When it comes to JSON and Shapefile outputs we're still returning
data in lat/lon order, however basically no JSON/Shapefile
clients that we know of can handle that order

I know we have had a jira issue open about that for quite some time
but... I cannot really find it now :-(

Cheers
Andrea

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Andrea Aime
OpenGeo - http://opengeo.org
Expert service straight from the developers.

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[Roald de Wit-2]

Hi sige,

sige wrote:
> Yes, it works. Does this mean that OpenLayers doesn't support the he highest
> WFS version for GeoJson?
>  
OpenLayers does support WFS 1.1 and GMLv3, but you might have to
explicitly tell OL that it should use GMLv3 or tell it to switch the
order of lon/lat to lat/lon (not 100% sure). If you are interested in
following that path, please post a message in the OL users list. I'm
sure there will be a few people able and willing to help you out.

Regards, Roald



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