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Mustafa646 | 2 Aug 2011 10:41
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Changing projection in OL code

I have a shapefile with native projection SWREFF99_1800. For publishing on
Geoserver, I changed it from SWREFF99_1800 to Spherical Mercator (EPSG:4326)
by using third party tool ogr2ogr. And finally i published it on Geoserver
and Displayed it over Google base map in my OL Web Page. 

I want to change this projection (from SWREFF99_1800 to EPSG:4326) by using
some code in my OL web page instead of changing it by using third party tool
before publishing it on Geoserver. Is it possible and if yes, then what will
be the possible code/method for this ?

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support.mn | 2 Aug 2011 11:44
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Re: Changing projection in OL code

Hello,

what "OL code" you are talking about?

Regards: Janne.

-------------------------------------------------------

Mustafa646 [noorcs22 <at> gmail.com] kirjoitti: 
> I have a shapefile with native projection SWREFF99_1800. For publishing on
> Geoserver, I changed it from SWREFF99_1800 to Spherical Mercator (EPSG:4326)
> by using third party tool ogr2ogr. And finally i published it on Geoserver
> and Displayed it over Google base map in my OL Web Page. 
> 
> I want to change this projection (from SWREFF99_1800 to EPSG:4326) by using
> some code in my OL web page instead of changing it by using third party tool
> before publishing it on Geoserver. Is it possible and if yes, then what will
> be the possible code/method for this ?
> 
> --
> View this message in context: http://osgeo-org.1803224.n2.nabble.com/Changing-projection-in-OL-code-tp6644040p6644040.html
> Sent from the PROJ.4 mailing list archive at Nabble.com.
> _______________________________________________
> Proj mailing list
> Proj <at> lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/proj
> 

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Mustafa646 | 2 Aug 2011 14:24
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Re: Changing projection in OL code

"OL code" means coding by using OpenLayers API Library.

Can i change projection of shapefile published on Geoserver by using
OpenLayers API ?

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Jean-Claude Repetto | 2 Aug 2011 15:19
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Re: Changing projection in OL code

Le 02/08/2011 14:24, Mustafa646 a écrit :
> "OL code" means coding by using OpenLayers API Library.
>
> Can i change projection of shapefile published on Geoserver by using
> OpenLayers API ?
>

Hello,

I think you are posting on the wrong ML. Try the Geoserver or OpenLayers 
mailing lists.

Jean-Claude
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Francesco Boccacci | 2 Aug 2011 17:44
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zagot | 4 Aug 2011 09:23
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Google Mercator Projection

Hi to All,
this is an oldie, but i cannot seem to find a solution.
When i want to do a transform on a wgs84 to google/bing the y coordinate
shifts.

I have read this  variuos post and this official note:
http://trac.osgeo.org/proj/wiki/FAQ#ChangingEllipsoidWhycantIconvertfromWGS84toGoogleEarthVirtualGlobeMercator

...so I tried adding +nadgrids= <at> null like i read, but with this example:

from ..."+proj=latlong +datum=WGS84";

to... "+proj=merc +a=6378137 +b=6378137 +lat_t1=0.0 +lon_0=0.0 +x_0=0.0
+y_0=0 +k=1.0 +units=m +nadgrids= <at> null +no_defs"

i have this result -626172.1357121646,  6887893.4928337997 

in the result y differ from correct value:6853955.508199729 (with Proj.NET
the result is correct)

..seems adding +nadgrids= <at> null  have no effect

what's I wrong?

thanks in advance

sorry for my english
thanks

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Jean-Claude Repetto | 4 Aug 2011 10:02
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Re: Google Mercator Projection

Le 04/08/2011 09:23, zagot a écrit :

> i have this result -626172.1357121646,  6887893.4928337997
>
What are the input coordinates ?
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zagot | 4 Aug 2011 10:56
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Re: Google Mercator Projection

ops sorry

this is input values

//trasform to radians
 Double R=0.0174532925199432958;
 Double X = -5.625*R;
 Double Y = 52.4827802220782*R;

then we have
x=-0.098174770424681035 
y=0.9159973154758253

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zagot | 4 Aug 2011 11:03
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Re: Google Mercator Projection

I use Proj.dll version 4.4.6 

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Jean-Claude Repetto | 4 Aug 2011 11:39
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Re: Google Mercator Projection

Le 04/08/2011 09:23, zagot a écrit :
> Hi to All,
> this is an oldie, but i cannot seem to find a solution.
> When i want to do a transform on a wgs84 to google/bing the y coordinate
> shifts.
>
> I have read this  variuos post and this official note:
> http://trac.osgeo.org/proj/wiki/FAQ#ChangingEllipsoidWhycantIconvertfromWGS84toGoogleEarthVirtualGlobeMercator
>
> ...so I tried adding +nadgrids= <at> null like i read, but with this example:
>
> from ..."+proj=latlong +datum=WGS84";
>
> to... "+proj=merc +a=6378137 +b=6378137 +lat_t1=0.0 +lon_0=0.0 +x_0=0.0
> +y_0=0 +k=1.0 +units=m +nadgrids= <at> null +no_defs"
>
> i have this result -626172.1357121646,  6887893.4928337997
>
> in the result y differ from correct value:6853955.508199729 (with Proj.NET
> the result is correct)
>
> ..seems adding +nadgrids= <at> null  have no effect
>
> what's I wrong?

You have forgotten to specify the datum for the projected CRS :

cs2cs +proj=latlong +datum=WGS84 +to +proj=merc +a=6378137 +b=6378137 
+lat_t1=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +datum=WGS84 +units=m 
+nadgrids= <at> null +no_defs
-5.625 52.4827802220782
-626172.14	6853979.30 0.00

Jean-Claude
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Gmane