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Hi! How to add custom 7 parameter geographic transormation (for example between MGI-C and WGS84)? Reason why i want add new transformation is because parameters in FME is not accurate enough for surveying purposes, so i want add new geographic transformation with official parameters released from state surveying administration

Hello @zolja87 . You can define a custom transformation in the <FME_Install_Folder>/Reproject/MyCoordSysDefs.fme file. There are examples in the file itself as well as information on the constants to use for each of the transformation methods (including 7 parameter), in our FME Workbench documentation. Here is a link to get you started: http://docs.safe.com/fme/html/FME_Desktop_Documentation/FME_Workbench/CoordSys/Geographic_Transformations.htm


Thank you for the informations @CandaceAtSafe


Hello @zolja87 . You can define a custom transformation in the <FME_Install_Folder>/Reproject/MyCoordSysDefs.fme file. There are examples in the file itself as well as information on the constants to use for each of the transformation methods (including 7 parameter), in our FME Workbench documentation. Here is a link to get you started: http://docs.safe.com/fme/html/FME_Desktop_Documentation/FME_Workbench/CoordSys/Geographic_Transformations.htm

If i give you my parameters can you please generate me a file cause it looks difficult to me


If i give you my parameters can you please generate me a file cause it looks difficult to me

Hi @shefqetlulja,

We have an interactive utility that lets you define custom coordinate systems, that can be found at fme.ly/coordsys.


Hi @shefqetlulja,

We have an interactive utility that lets you define custom coordinate systems, that can be found at fme.ly/coordsys.

it is not for custom transformation? it is for custom coordinate systems as i understood


it is not for custom transformation? it is for custom coordinate systems as i understood

Sorry - that's true. Please provide the transformation parameters, and I will create a definition for you.


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