[Tilecache] Convert Spherical Mercator coordinates to Lat/Lng?

[Dane Springmeyer]

Chris,

On Nov 16, 2008, at 4:51 PM, chris marx wrote:
> sorry, forgot to "reply all"
> here's my response:
>
> great that totally worked.

? I assume you mean the OL js?

> I'm going to send a request to Manifold GIS to officially add that  
> projection. For the moment, my data (which is in the world mercator

perhaps you could actually reproject your data to spherical mercator?

ogr2ogr google_merc.shp world_merc.shp -t_srs http://spatialreference.org/ref/user/6/

> ) is near its correct position, as long as you're not zoomed way  
> out. thanks for your help!!!

huh. sounds like a problem.


>
>
> PS. Manifold GIS doesnt use proj.4, but you can add projections from  
> WKT, I'll play around with that-
>
try:

http://spatialreference.org/ref/user/6/esriwkt/


Dane



>
>
> On Sun, Nov 16, 2008 at 7:44 PM, Dane Springmeyer  
> <blake at hailmail.net> wrote:
> Its TMS (Tile Map Service), right?
>
> http://wiki.osgeo.org/wiki/Tile_Map_Service_Specification
>
> Does manifold use Proj.4 for projections support?  If it does then  
> just adding a record for spherical mercator in the espg file should  
> allow the WMS to support spherical mercator. If not, then  
> nevermind. :)
>
> Sounds like the openlayers forward/inverse js code is exactly what  
> you need, but....  kinda begs the question again... maybe use  
> OpenLayers?
>
> If your digitizing stuff in gmaps is the only hangup - I'd just note  
> that OpenLayers has got an impressive editing framework that you  
> could likely contribute to.
>
> Dane
>
>
>
> On Nov 16, 2008, at 2:13 PM, chris marx wrote:
>
>> Hi,
>>  I've got the TileCache TSM service working (thanks to the list for  
>> tips!), but unfortunately, my WMS does not support the "Spherical  
>> Mercator" projection. For the moment, i rewrote the wms service to  
>> switch up the espg and coordinates from tilecaches's tsm request  
>> and converting them to lat/lng, so that at least the WMS request  
>> will go through, but I assume a standard mercator projection to do  
>> the conversion (which is obviously wrong). Since my GIS/WMS doesn't  
>> support this projection, does anyone have the necessary code to  
>> convert coordinates from the spherical mercator to lat/lng?
>> Thanks!
>>
>> -- 
>>
>> Chris Marx
>> Programmer/Analyst
>> Cornell Lab of Ornithology
>> 159 Sapsucker Woods Rd.
>> Ithaca, NY 14850
>> t. 1.607.254.1142
>> http://www.birds.cornell.edu/
>> _______________________________________________
>> Tilecache mailing list
>> Tilecache at openlayers.org
>> http://openlayers.org/mailman/listinfo/tilecache
>
>
>
>
> -- 
>
> Chris Marx
> Programmer/Analyst
> Cornell Lab of Ornithology
> 159 Sapsucker Woods Rd.
> Ithaca, NY 14850
> t. 1.607.254.1142
> http://www.birds.cornell.edu/

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