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I have a feature class in GCS North American 1983 that I need to convert to US National Atlas Equal Area. When I try to use the Project feature in ArcToolbox, after selecting US_National_Atlas_Equal_Area as the output coordinate system, I get this error:

Warning 001839: A datum transformation is expected, but the parameter is empty.

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You will need to supply a transformation. This link should get you a PDF from ESRI listing the appropriate transformation for your area of interest. Here is a link to some ESRI documentation on transformations.

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  • you may wish to update the first link to not include the Google Search portion. Direct link: downloads2.esri.com/support/TechArticles/…
    – SMiller
    Commented Oct 23, 2018 at 15:01
  • Thank you. It doesn't look like there are any transformations in these docs for US National Atlas Equal Area though?
    – surrogatekey
    Commented Oct 23, 2018 at 15:16
  • Ah wait, think I just got it converted with geopandas -
    – surrogatekey
    Commented Oct 23, 2018 at 15:40

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