Bill93 Posted April 26, 2017 Share Posted April 26, 2017 The professional surveyors forum has an interesting post summarizing a recent conference at NGS. It helps understand where NGS is headed, and why bench marks, although still useful, will be less important after 2022. Basically, there will be no more updating of passive mark data sheet coordinates or elevations, as has been done in the past from NAD27 to NAD83(86) to various realizations up through NAD83(2011). The most accurate measurements will rely on GPS measurements and a gravity model derived by the GRAV-D program. It will take a while for various users to switch over, so they will still need the passive marks for a while. Look at the Corps of Engineers - many of their projects are still on NAD27. Some cities are still on NGVD29 elevations. Quote Link to comment
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