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I have data (vectors, and raster) that are in UTM coordinate system, and I need to reproject them to a local coordinate system. Unfortunately, I do not know the transformation method that I may use either the transformation parameters (there or seven parameters) :( However, I can get get some points surrounding the AOI in both UTM and equivalent local coordinate system. My question is, how can I get the transformation parameters using these points and the UTM and local projection parameters to get the transformation method and parameters?

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    What program or library? – user30184 Jun 15 '17 at 11:35
  • You wouldn't use the 3/7 parameter datum transformations methods, unless there's only a datum change, but a 2D conformal or affine transformation. – mkennedy Jun 15 '17 at 20:30
  • I'm searching for a tool that reverse engineer the transformation tool, I can provide points in two different GCSs and I need to know the 3 / 7 parameters of transformation – Ahmed Samir Jun 28 '17 at 15:22
  • @mkennedy There is a datum change – Ahmed Samir Jun 28 '17 at 15:23

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