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

[bartvde at osgis.nl]

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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