[OpenLayers-Users] Convert Coordinates EPSG:4326 to 31466 doesn?t work ??

[Bytechanger]

Thanks,

But I´ve never found working towgs84 Coordinates for Germany, NRW.
Each time the points differes 50m!

Where can I get the right values?

Greetings 

Byte



bartvde wrote:
> 
> I think you need to add the right towgs84 parameters to your projection
> definition.
> 
> For Dutch national grid I use (I added the towgs84 params):
> Proj4js.defs["EPSG:28992"] = "+proj=sterea +lat_0=52.15616055555555
> +lon_0=5.38763888888889 +k=0.9999079 +x_0=155000 +y_0=463000 +ellps=bessel
> +units=m
> +towgs84=565.2369,50.0087,465.658,-0.406857330322398,0.350732676542563,-1.8703473836068,4.0812
> +no_defs ";
> 
> Google [1] or check the EPSG database for the right towgs84 settings for
> your projection.
> 
> [1] http://osdir.com/ml/gis.geotools2.user/2006-12/msg00069.html
> 
> Best regards,
> Bart
> 
>>
>> Hi,
>>
>> it seems to work.
>> But e.g. converting from 4326 to 31466 is very naccurately
>> <http://dict.leo.org/ende?lp=ende&p=5tY9AA&search=inaccurately>
>> naccurately.
>> There a difference of 10-100 meters!!
>> ??????????????????
>>
>> Greetings
>>
>> Byte
>>
>>
>> Tobias Wendorff (via Nabble) schrieb:
>>> Bytechanger schrieb:
>>> > MsgBox shows source coordinates .... no convert!
>>>
>>> Download proj4js and include it:
>>>
>>> <script type="text/javascript" src="../proj4js/lib/proj4js.js"></script>
>>> <script type="text/javascript"
>>> src="../proj4js/lib/projCode/merc.js"></script>
>>> <script type="text/javascript"
>>> src="../proj4js/lib/projCode/tmerc.js"></script>
>>>
>>> Then define everthing:
>>> Proj4js.defs['EPSG:4326'] = '+proj=longlat +ellps=WGS84 +datum=WGS84
>>> +nadgrids=@null +no_defs';
>>>
>>> Proj4js.defs['EPSG:900913']= '+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';
>>>
>>> Proj4js.defs['EPSG:31466'] = '+proj=tmerc +lat_0=0 +lon_0=6 +k=1.000000
>>> +x_0=2500000 +y_0=0 +ellps=bessel +units=m +nadgrids=@null +no_defs';
>>>
>>> Okay, you don't need 909913 and merc, I think ... but I like to
>>> have control about these settings.
>>>
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>>
>>
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