[GeoNode-users] Layers with epsg:4618 shiffting in GeoNode

[Simone Dalmasso]

That's correct, GeoNode is not reprojecting, the issue should be somewhere
in geoserver.

2015-06-16 21:16 GMT+02:00 Stefan Steiniger <sstein at geo.uzh.ch>:

>  Hi Daniel (thanks for re-routing back to the list)
>
> If it is indeed the projection, then the problem is with GeoServer and the
> projection library used (geotools?).
> So, I doubt that parsing the code is the problem, but the parameters set
> in GeoServer, and not with GeoNode.
>
> see this too:
>
> http://docs.geoserver.org/stable/en/user/advanced/crshandling/customcrs.html
>
> cheers from Santiago de Chile,
> stefan
>
>
> On 06/16/2015 03:59 PM, Daniel Victoria wrote:
>
>    -- replying to the list --
>
>  Hi Stefan,
>
>  Thanks for the input. EPSG:4618 is a geographic coordinate system based
> on the South American Datum. And apparently somewhere GeoNode is not liking
> this coordinate system. If I convert the data to EPSG:4326 in QGis prior to
> uploading, it all works fine. Could it be that QGIS understands the .prj
> file for the EPSG:4618 but GeoNode does not and assumes EPSG:4326?
>
>  By looking at the ISO metadata from the EPSG:4618 layer, it tells me that
> the data is in EPSG:4326. Does GeoNode converts the SRS on layer upload? Or
> is that telling me that my projection file was bogus?
>
>  Thanks
>  Daniel
>
>
>
> On Tue, Jun 16, 2015 at 2:29 PM, Stefan Steiniger <sstein at geo.uzh.ch>
> wrote:
>
>>  perhaps a silly question:
>>
>> (a) are you indeed having the same coordinate system (same prj files?)
>> for both shape files?
>> (b) what happens if you not use epsg:4618 but some UTM? (sorry can't
>> figure exactly what 4618 is... it looks like geographic coordinates, so
>> perhaps a projection makes sense)
>>
>> see also this:
>> http://wiki.osgeo.org/wiki/Brazilian_Coordinate_Reference_Systems
>>
>> cheers,
>> stefan
>>
>>
>> On 06/16/2015 11:26 AM, Daniel Victoria wrote:
>>
>>    ​
>>  point_error.7z
>> <https://drive.google.com/file/d/0B5VE16NDdlfERE5yenZNaHY2bTA/edit?usp=drive_web>
>> ​​
>>  TC_AC_2010_00167.zip
>> <https://drive.google.com/file/d/0B5VE16NDdlfEaGNHZ2ZSU0RjMHM/edit?usp=drive_web>
>> ​I've got two shapefiles with epsg:4618. One is a polygon layer with
>> loads of geometry errors and the second is a point layer with the error
>> location. When I load both in QGIS, polygons and errors are aligned
>> (layers_qgis.png). I then uploaded the layers to GeoNode (2.4b24) and
>> points and polygons have shifted (layers_geonode.png).
>>
>> I then added back the two layers in QGis using WMS services. The points
>> layer shifted a little (~8 meters - point_error.png) but polygons shifted
>> 69 m (poly_error.png).
>>
>> Any idea what could be wrong?
>>  The shapefiles (poligon and points) can be downloaded from the google
>> drive links
>>
>>  Thanks
>>  Daniel
>>
>>
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>>
>>
>>
>
>
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>


-- 
Simone
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