Re: [thredds] EPSG 3857 (google maps / 900913) in TDS 4.2.5

• To: thredds@xxxxxxxxxxxxxxxx
• Subject: Re: [thredds] EPSG 3857 (google maps / 900913) in TDS 4.2.5
• From: Ethan Davis <edavis@xxxxxxxxxxxxxxxx>
• Date: Thu, 31 Mar 2011 11:49:09 -0600

Hi Jon,

Could you also ask the Geotoolkit mailing list about the WKT for
EPSG:3408 and EPSG:3409 as well?

All, I will release TDS 4.2.6 probably early next week with this fix in
the distribution. I'll also make the updated epsg-wkt.jar file available
separately in case that is easier for anyone.

I'm going to try updating the geotk-bundle-reference.jar and see how
smoothly that goes. Though I'll probably wait for TDS 4.2.7 before
including it in a release.

Thanks to everyone for finding the solution to this.

Ethan

On 3/31/2011 8:39 AM, Jon Blower wrote:
> Hi Ivan,
> 
> Ah, I'd forgotten that the current TDS uses the espg-properties
> file. The next version will embed the full EPSG database, which
> should fix this issue. Sorry, I don't know what the correct
> parameters for 3857 should be. I'll ask the Geotoolkit mailing
> list and get back to you if I get an answer.
> 
> Cheers, Jon
> 
> 
> -----Original Message-----
> 
> Message: 5
> Date: Thu, 31 Mar 2011 16:15:52 +0200
> From: Ivan PRICE <ivan.price@xxxxxxxxxxx>
> To: thredds@xxxxxxxxxxxxxxxx
> Subject: Re: [thredds] EPSG 3857 (google maps / 900913) in TDS 4.2.5
> Message-ID: <4D948C98.5000505@xxxxxxxxxxx>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> Ok thanks Jon,
> 
> i tried upgrading the version of geotoolkit-bundle-referencing.jar but 
> it resulted in java exceptions when i did getMap requests.
> 
> I then had a poke around in the file: epsg-wkt.jar and noticed that it 
> was missing an entry for epsg 3857
> 
> 3857=PROJCS["WGS 84 / Pseudo-Mercator",GEOGCS["Popular Visualisation 
> CRS",DATUM["Popular_Visualisation_Datum",SPHEROID["Popular Visualisation 
> Sphere",6378137,0,AUTHORITY["EPSG","7059"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6055"]],
>  
> PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.01745329251994328,
>  
> AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4055"]],UNIT["metre",1,AUTHORITY["EPSG","9001"]],
>  
> PROJECTION["Mercator_1SP"],PARAMETER["central_meridian",0],PARAMETER["scale_factor",1],
>  
> PARAMETER["false_easting",0],PARAMETER["false_northing",*-14500*],AUTHORITY["EPSG","3785"],
>  
> AXIS["X",EAST],AXIS["Y",NORTH]]
> 
> 
> adding the above line to the epsg.properties file gets the WMS maps 
> working, but they are shifted to the north by about 14km.  I have to add 
> that bogus false northing to get them to line up properly.. ok for now 
> but theres something screwy going on somewhere. maybe my definition i 
> added is bad ? i got it from here:
> http://spatialreference.org/ref/sr-org/6864/
> 
> 
> cheers,
> 
> -i
> 
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• References:
  • Re: [thredds] EPSG 3857 (google maps / 900913) in TDS 4.2.5
    • From: Jon Blower