Change to EPSG:3857 from 900913

[Jukka Rahkonen]

Hi,

The config files of Mapstore define the Web Mercator projection as "projection": "EPSG:900913".  However, many WMS servers do not support out-of-the box that code any more but only the official EPSG:3857. Mapserver belongs to those servers. Could you consider changing the projection code or do you think that the change would break something?

-Jukka Rahkonen-

[Tobia Di Pisa]

Hi Jukka,

in MapStore you have to:

1) Enable the proj4js script tag in your template. For example inside the composer.html you have just to uncomment the line below:

<!--script type="text/javascript" src="script/proj4js.js"></script-->

2) Add the EPSG:3857 proj4js definition to the mapstore configuration file (the default one is inside  the mapStoreConfig.js file):

"proj4jsDefs": {
     "EPSG:3857": "+title= Google Mercator EPSG:3857 +proj=merc +a=6378137 +b=6378137 +lat_ts=0.0 +lon_0=0.0 +x_0=0.0 +y_0=0 +k=1.0 +units=m +nadgrids=@null +no_defs"
 },

3) Use directly the EPSG:3857 in the map projection definition (inside the configuration file):

"map": {
    "projection": "EPSG:3857",

This should be all, if you need to use the EPSG:3857 for your map.

Best Regards,

     Tobia Di Pisa

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2013/11/27 Jukka Rahkonen <jukka.r...@latuviitta.fi>

Hi,

The config files of Mapstore define the Web Mercator projection as "projection": "EPSG:900913".  However, many WMS servers do not support out-of-the box that code any more but only the official EPSG:3857. Mapserver belongs to those servers. Could you consider changing the projection code or do you think that the change would break something?

-Jukka Rahkonen-

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[Jukka Rahkonen]

Hi,

I am not so much thinking about myself as a MapStore user. I am thinking about all the people running MapStore with the default settings and myself as WMS server admin. We do not support EPSG:900913 in our WMS which means that those poor MapStore users cannot read the good data we might have for them. But if there is no way to discard 900913 we all must just learn how to handle it.

-Jukka-

[Andrea Aime]

On Wed, Nov 27, 2013 at 7:11 PM, Jukka Rahkonen <jukka.r...@latuviitta.fi> wrote:

Hi,

I am not so much thinking about myself as a MapStore user. I am thinking about all the people running MapStore with the default settings and myself as WMS server admin. We do not support EPSG:900913 in our WMS which means that those poor MapStore users cannot read the good data we might have for them. But if there is no way to discard 900913 we all must just learn how to handle it.

As an aside, I believe that while GeoWebCache advertises by default only support for 900913, it has an internal

alias so that if you hit it with 3857, it will work anyways:

https://github.com/GeoWebCache/geowebcache/blob/master/geowebcache/core/src/main/java/org/geowebcache/grid/SRS.java#L32

Cheers

Andrea

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