Some previous posts have starting discussing LiDAR data in Ontario, Canada using the PCS: NAD83 CSRS v7 (epoch 2010). This is related, but more specifically about how ArcMap handles some of these projections and their differences. Hoping Melita Kennedy is watching this thread
We are using both ArcMap 10.6x with some partner agencies using 10.3x. We noticed that the new GCS for NAD83CSRS v7 (8255) is available in ArcGIS 10.6x and Pro, so we've created a new custom PCS using this GCS reference. This creates our PCS projection file - all is well so far.
Our questions are when looking at the details of the new PRJ and the related GCS PRJ files...