What is the best geographic transformation for Alaska to go from NAD83 to NAD83 (NSRS2007)?

Esri available transformation for GCS_NAD_1983_NSRS2007 to NAD83:

WGS_1984_(ITRF00)_To_NAD_1983 + NAD_1983_NSRS2007_To_WGS_1984_1
NAD_1983_To_WGS_1984_5 + NAD_1983_NSRS2007_To_WGS_1984_1
NAD_1983_To_WGS_1984_1 + NAD_1983_NSRS2007_To_WGS_1984_1

The suggestion from the below post is to use WGS_1984_(ITRF00)_To_NAD_1983.
Geographic Transformations in Alaska Between NAD83 and WGS84

Looks like this is still the best option for Alaska for NAD83 to WGS84. I am wondering about the second half of the transformation "chain." Because NAD_1983_NSRS2007_To_WGS_1984_1 is a null transformation it is putting the NAD83 into the WGS84 realization that is tied to ITRF 2000 and then saying that this is equal to NAD83 (NSRS2007). I would think that we would need a transformation "chian" like WGS_1984_(ITRF00)_To_NAD_1983 + WGS_1984_(ITRF00)_To_NAD_1983_CORS96 to account for the change from NAD83 to NAD83 (NSRS2007).

(Transformation parameters can be found in this Esri document: http://downloads2.esri.com/support/TechArticles/geographic_transformations_1040.pdf)

  • 1
    As per the tour there should be only one question per question.
    – Midavalo
    May 3, 2017 at 0:40
  • @Midavalo I reworded the last part of the post. Can you please take it off hold now?
    – fallingdog
    May 3, 2017 at 16:44


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