Hi Stipica I think that for a 7 parameter transformation 'bwscale' has to be used or else there aren't enough parameters. The manual is a little confusing there and I'll ask to get it changed.
You seem to be well informed about these issues (more so than myself I think) but you may still find it useful to take a look at http://www.mentorsoftwareinc.com/CC/gistips/TIPS0898.HTM which explains the differences between Bursa-Wolf and the regular 7-parameter transformation. Hope this is of use, Regards, Mark Mark Ireland, Product Support Engineer Safe Software Inc. Surrey, BC, CANADA [EMAIL PROTECTED] http://www.safe.com Solutions for Spatial Data Translation, Distribution and Access > -----Original Message----- > From: stipicapavicic [mailto:[EMAIL PROTECTED] > Sent: March 18, 2005 2:14 AM > To: [email protected] > Subject: [fme] Re: Custom spatial reference system > > > > > Hi Mark, > > I'll try to use latest build, probably it will help. > But I have one more question regarding 7 parameter trensformation. > > Bursa Wolf transformation is valid for rotation angles about > 2'' and less. My transformation parameters include rotation > of 11'', and 6'', how can I transform data with that > parameters (3 translation, 3 rotations and scale) if the > 7PARMETER does not include any scale parameters. > > Why it is called 7PARMETER? It only treats 6 parameters (2 > translations and 3 rotations). > > Can you please explain me what to do. > > Thnaks, > > Stipica Pavicic > > > > --- In [email protected], "Mark Ireland" <[EMAIL PROTECTED]> wrote: > > Hi Stipica > > I tried this with build 1636 and didn't have this problem at all. In > fact I got a message stating... > > > > Reproject: Using datum conversion type `SevenParmInv' > > > > ...which seems to me to indicate the datum has been recognised > properly. > > > > My suggestions would be... > > > > 1) I've attached the coordsysdef I created. Try this one. > > 2) Upgrade your FME build to the latest beta and see if that helps. > BTW What build are you using? > > > > Besides this you don't need to put an entry into coordsys.db - FME > should pick up everything in mycoordsysdefs automatically. > > > > Hope this helps. I don't know why 7Param datums have a bwscale > defined - but the help system is quite clear - this parameter > is 'used by BURSA only'. > > > > Regards, > > > > Mark > > > > Mark Ireland, Product Support Engineer Safe Software Inc. > Surrey, BC, > > CANADA [EMAIL PROTECTED] http://www.safe.com Solutions for Spatial Data > > Translation, Distribution and Access > > > > > -----Original Message----- > > > From: stipicapavicic [mailto:[EMAIL PROTECTED] > > > Sent: Thursday, March 17, 2005 3:20 AM > > > To: [email protected] > > > Subject: [fme] Custom spatial reference system > > > > > > > > > > > > > > > Hi group, > > > can anyone tell me what I'm doing wrong. > > > I wanted to defnine the new spatial reference system in FME. > > > First I have defined geodetic datum in MyCoordSysDefs.fme file. > > > > > > #--------------------------------------------- > ----------------------- > > > > > > # Hrvatski geodetski datum 1901 > > > DATUM_DEF HR1901 \ > > > DESC_NM "Hrvatski datum 1901" \ > > > SOURCE "State Geodetic Administration, Croatia" \ > > > ELLIPSOID BESSEL \ > > > USE 7PARAMETER \ > > > DELTA_X 551.73 \ > > > DELTA_Y 162.86 \ > > > DELTA_Z 467.93 \ > > > BWSCALE -4.820429 \ > > > ROT_X -6.037326 \ > > > ROT_Y -1.957325 \ > > > ROT_Z 11.381551 > > > > > > In the same file (MyCoordSysDefs.fme) I've added a definition of > > > coordinate system # > > > -------------------------------------------------------------- > > > # Croatia GK zone 5 > > > > > > COORDINATE_SYSTEM_DEF HR_GK_5 > \ > > > DESC_NM "Croatian GaussKruger Zone 5 - 15�" \ > > > SOURCE "State Geodetic Administration, Croatia" \ > > > UNIT METER \ > > > DT_NAME HR1901 \ > > > PROJ TM \ > > > PARM1 15 \ > > > ORG_LAT 0.0 \ > > > SCL_RED 0.9999 \ > > > MAP_SCL 1.0 \ > > > X_OFF 5500000.0 \ > > > Y_OFF 0 > > > # ---------------------------------------------------------------- > > > > > > In the coordsys.db I've added one line HR_GK_5|Croatia GK > Zone 5 - > > > 15�|EUROPE||HR1901|TM|METER > > > > > > When I restart the FME and trie to convert data form LL84 to new > > > defined system (HR_GK_5) I got message in the Translation Log: > > > "Unknown datum name 'HR1901' or ellipsoid name ''. No coordinate > > > system set." > > > > > > I don't know what else to do. I have tried do make such > definition > > > in LocalCoordSysDefs.fme but I get the same result. > > > > > > PS > > > how the 7PARAMETER transformation treats BWSACLE. By > reading manual > > > it seems that BWSCLAE can be applied only to BURSA transformation > > > but in LocalCoordSysDefs.fme there are definition wich combines > > > these parameters (7PARAMETER and > BWSCALE). > > > > > > Thanks, > > > > > > Stipica Pavicic > > > > > > > > > > > > > > > > > > > > > > > > > > > Get the maximum benefit from your FME, FME Objects, or > SpatialDirect > > > via our Professional Services team. Visit > www.safe.com/services for > > > details. > > > Yahoo! Groups Links > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > Get the maximum benefit from your FME, FME Objects, or > SpatialDirect via our Professional Services team. Visit > www.safe.com/services for details. > Yahoo! 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