Hello, I am having trouble with locating the .gtf that I created using Create Custom Geographic Transformation tool. I am converting a data set from an unknown projection to NAD 83 16N. I already have the formulas for my coordinate transformation and did twelve points by hand, but I would like to create a .gtf I can use to transform all of my data to UTM. Even though I can find the .gtf I have created when I go to computer\Documents and Settings\\Application Data\ESRI\ArcToolbox\CustomTransformations, it doesn't show up when I use tools like "define projection" and then go to the custom list. Is this happening because I don't already have an existing projection?
Mapping Center Answer:
There could be two things happening. Because the in data doesn't have a coordinate system, the tool can't match it against the transformation. What did you use for the input coordinate system for the custom transformation? If the tool allowed nothing, that could be a bug!
The other possible issue is that we block geographic transformations from being used for non-GCS data. So if you create a custom GT and use a PCS for the input or output coordinate system, it'll really be the underlying GCS that is used.
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