This may not be an issue for many GIS-ers but has anyone else had experiences transforming from modern NAD83 (CORS) to HARN coordinates and vice versa? I realize the discrepancy might be something like 10cm but for sources like low-level aerial, mobile lidar or ground surveys, this is still a big deal. What is the best practice? Most states still require HARNs as a deliverable coordinate system, and many companies survey tied to the lastest realization of the CORS network.
An ArcGIS implementation would be appreciated.
Also this might lead to an interesting discussion for those who think the NAD83 -> HARN transformation in ArcGIS is the right thing to do with modern GPS-derived survey data (it's not!).