Well, the problem is the datum definition. The definitions you find in the definition file are usually provided by some national ressources and are mostly general parameters that fit over large areas (say, country wide). Not very well, but reasonably well as long as you work at small scales.
You will probably have to contact your data provider which datum definition they use. That definition can be entered in the file Program files\FME\Reproject\MyCoordSysDefs.fme or where ever you installed FME, as a new DATUM_DEF entry. The datum definition is the transformation from WGS-84 (which is always the base) to any other spheroid and takes into account the size of the spheroid as well as the particular position and rotation. Please follow the descriptions. And be careful when entering: The units of the provided values may be different than FME assumes, and frequently you will have to introduce the three angles with different signs than provided. But, as mentioned, when the datum definitions provided do not suffice well enough you will have to get (or calculate, if you have the possibility) better ones. Good luck, Wolfgang --- In [email protected], "akkabi_oa" <[EMAIL PROTECTED]> wrote: > > > Hello all, > > I have a question about the coordinate system, which we have to use for > FME. > > It's about a conversion from dgn to sdf. > dng is RD-New , sdf must to LL-WGS84 (But which one?). > > WGS84 is in different types, but everytime I get not the right > location. ( about 20m difference). > > Can you indicate which coordinate system I have to use? > > Thanks for any suggestions, > > akkabi > For insights into what's up at Safe Software and what's on the development horizon, visit Safe's blog at spatial-etl.blogspot.com. Safe Software has also made slides available that outline enhancements planned for FME 2007. The slides are from the "Road Ahead" presentation given on Day 2 of the FME Worldwide Users Conference. To view these slides, visit www.safe.com/2006uc. Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/fme/ <*> Your email settings: Individual Email | Traditional <*> To change settings online go to: http://groups.yahoo.com/group/fme/join (Yahoo! ID required) <*> To change settings via email: mailto:[EMAIL PROTECTED] mailto:[EMAIL PROTECTED] <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
