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

[Stefan Steiniger]

sorry for actually not answering your questions. I give it a shot now:

(a) GeoServer should not transform your data into a different system. 
When I look at my Chilean data ("Layers" list in GeoServer > Native 
SRS), they are still in the uploaded CRS (EPSG 32719), or in EPSG:4326 
for data from OpenStreetMap.

(b) it may be that GeoServer does not understand the EPSG you have and 
therefore use another projection.

(c) if you display your GeoNode data, the GeoExplorer client should 
request the data in the Google Projection (forgo the EPSG code) to be 
able to overlay it with the Tiles from base map providers. So, the CRS 
that your data have when you request the data, depends on your client / 
request to GeoServer.

stefan

On 06/16/2015 04:16 PM, Stefan Steiniger wrote:
> 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 
>> <mailto: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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