I'm using RTK with SOPAC stations (http://sopac-csrc.ucsd.edu). The relevant reference system is California SRS Epoch 2017.5 (NAD83).

I am trying to load the coordinates I got in this system, but I couldn't find any transformation from this system to any other standard system (for example: WGS84, NAD83, NAD_1983_StatePlane_California_II_FIPS_0402). I even asked Esri but they said they couldn't help me and that such transformations doesn't exist in ArcGIS Pro.

What should I do?

  • What was Esri’s exact response?
    – PolyGeo
    Commented Feb 21, 2022 at 22:06
  • What coordinate system are you trying to transform into?
    – Mintx
    Commented Feb 21, 2022 at 22:08
  • @PolyGeo, that there are no relevant transformations.
    – gisman
    Commented Feb 21, 2022 at 22:25
  • @Mintx, to NAD_1983_StatePlane_California_II_FIPS_0402 for example. Or to WGS84 / NAD83
    – gisman
    Commented Feb 21, 2022 at 22:28
  • Are you using ArcGIS Pro or ArcMap?
    – PolyGeo
    Commented Feb 21, 2022 at 22:50

1 Answer 1


Note: I work for Esri.

We have no transformations for California SRS Epoch 2017.5 (NAD83). I think it's actually a time-fixed version of NAD83 (2011), or at least closely related. I've never been able to find a transformation for it.

You could use the Create Custom Geographic Transformation tool to define a null or zero parameter transformation to NAD 1983 (2011). Converting to WGS 84 or NAD83 (original) should probably use a non-zero transformation because the current WGS 84 realization is generally about 1 m offset from NAD 1983 (2011).

  • It is documented that CSRS system is consistent with NAD 83(2011) epoch 2010.00. What "consistent* means in this context? Also, what's NAD 83(2011) epoch 2010.00 EPSG/ESRI code is? Is it 6318?
    – gisman
    Commented Feb 25, 2022 at 8:31

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