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

[Tobias Wendorff]

Google: "lverma transformation", first entry.

Use shift-parameters for NRW.

Accurancy +/- 34 cm.




Am Do, 15.10.2009, 14:25 schrieb 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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