The 200th Anniversary of the National Geodetic Survey is coming up - from origins as the Survey of the Coast, signed into existence by Thomas Jefferson, on February 10th, 1807 to the present, a legacy of much excellent work. NOAA and NGS have many events planned in celebration of their 200-year legacy of success.
With this, also comes the unveiling of the National Readjustment of NAD83 - NAD83(NSRS 2007). A key benefit of this will be in that this adjustment will be performed using all data in the National Spatial Reference System (NSRS), as opposed to the previous efforts, which were statewide and regional. The first, NAD83(1986) was performed on states, multi-state regions and so on.
Later on, with improved GPS capability came NAD83(HARN), referencing the High-Accuracy Reference Network. This exposed positional issues in the previous NAD83(1986) adjustment, and again, the HARN adjustments were performed on a state or regional basis.
As time progressed, we saw the emergence of the national Continuously-Operating Reference Stations (CORS) system - and with this, we gained a national network of GPS coordinates, which however exposed inconsistencies with the state and regional networks.
Now, with NAD83(NSRS 2007), 70,000 GPS points nationwide have been put into the mix, in a massive effort to place all of these on a common reference system, to eliminate the longstanding inconsistencies from adjustment to adjustment, network to network. With the excellent leadership of people at NGS like Dave Doyle, this release will be a boon to survey-grade, geodetic projects nationwide.
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