Under the geographic transformation HK1980 to WGS84 , so do the FME make the automatic transformation using the transformation parameters if they have already been in the default gallery?
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Under tool, geographic transformation , there is some default transformation gallery, do the coordinate system transform automatically from the reader to the writer using the default geographic transformation parameters ?
Best answer by mark2atsafe
Yes, if the datum changes in a reprojection, then FME must apply a method (parameters or a grid) to convert the data. That dialog just shows the list of transformation. If you go to Tools > FME Options > Coordinate Systems then you can look up a certain transformation (say AGD84 to GDA94) and - if there are grids available - edit the default options. Sometimes (like NAD27 to NAD83) there are different options that you can choose as the default by moving it up in the list.
I don't think HK1980 has a grid, so there is no option to change the order.
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