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An Analysis of the NAD83 (NSRS 2007) National Readjustment
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2008
[PDF-6.29 MB]
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Description:On February 6, 2007, the final fixed adjustment of the NAD 83(NSRS2007) National Readjustment was completed. GPS carrier phase data, reduced to correlated inter-station vectors observed from 1983 to November 2005, were processed in a simultaneous least-squares adjustment. A CORS coordinate set, epoch 2002.0, established the NAD 83 system; although crustal motion effects were applied to coordinates and vectors in California, Arizona, Nevada, Oregon, and Washington to realize an epoch of 2007.0. FGDC network accuracies (95% a posteriori statistics) show medians of 1.03 cm horizontal and 1.84 cm vertical. Analysis of the residuals shows insufficient outer rejection and the potential need to reweight four categories of projects. These problems lead to long tails in statistical distributions and inflation of the a posteriori statistics. Comparisons show that less than 1% of the residuals change horizontally by 1 cm or more between the free and fixed adjustments.
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Rights Information:CC0 Public Domain
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