Google: "lverma transformation", first entry. Table is on the bottom.
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 >>>> +nadgri...@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 +nadgri...@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 +nadgri...@null +no_defs'; >>>> >>>> Okay, you don't need 909913 and merc, I think ... but I like to >>>> have control about these settings. >>>> >>>> _______________________________________________ >>>> Users mailing list >>>> [hidden email] >>>> <http://n2.nabble.com/user/SendEmail.jtp?type=node&node=3788136&i=0> >>>> http://openlayers.org/mailman/listinfo/users >>>> >>>> >>>> ------------------------------------------------------------------------ >>>> View message @ >>>> http://n2.nabble.com/Convert-Coordinates-EPSG-4326-to-31466-doesn-t-work-tp3787906p3788136.html >>>> >>>> To unsubscribe from Convert Coordinates EPSG:4326 to 31466 doesn?t >>>> work ??, click here >>>> < (link removed) =>. >>>> >>>> >>> >>> >>> -- >>> View this message in context: >>> http://n2.nabble.com/Convert-Coordinates-EPSG-4326-to-31466-doesn-t-work-tp3787906p3793412.html >>> Sent from the OpenLayers Users mailing list archive at Nabble.com. >>> _______________________________________________ >>> Users mailing list >>> [email protected] >>> http://openlayers.org/mailman/listinfo/users >>> >> >> >> _______________________________________________ >> Users mailing list >> [email protected] >> http://openlayers.org/mailman/listinfo/users >> >> > > -- > View this message in context: > http://n2.nabble.com/Convert-Coordinates-EPSG-4326-to-31466-doesn-t-work-tp3787906p3828964.html > Sent from the OpenLayers Users mailing list archive at Nabble.com. > _______________________________________________ > Users mailing list > [email protected] > http://openlayers.org/mailman/listinfo/users > _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users
