| 125 | 125 | This implementation leaves all of the precious HARN/?? datum shifts in place. It introduces a new datum named NAD83/HARN. The transformations referneced to this new datum are the only transformations which reference the new 48HPGN data set. End users which have the need to have a specific set of HPGN grid shift files can achieve this by simply placing an entry for the superceeding HPGN data file set ahead of the 48HPGN data file set reference in the Geodetic Transformation Dictionary. Thus, a user working in the Four Corners area of the southwest, can specificy that, for example, the Arizona datum shift values are to prevail can do so by entering a reference to azhpgn,l?s ahead of the reference to 48hpgn.l?s. Editing the Geodtic Transformation Dictionary is recognized as not being an ideal solution, but given the nature of the beast, it is the best available short of adding the possibility of user interaction required when certain coordinate conversions are selected. |
