Random samples were generated within each data set being evaluated. Sample areas were then checked against NHAP color infrared photography for correctness within the fixed sample plot. Results of the analysis were plotted in confusion matricies and analyzed for conformance to the 95 percent classification accuracy specification. They suggested rewording the definition of this class, as noted in the Entity and Attribute Overview element. These activities have taken place in the last 15 years.
All polygons are closed and lines intersect where intended.
Completeness ata provides complete coverage over the stated extent of the data Horizontal Positional Accuracy Unknown. The 30 meter source imagery sampling size automatically introduces a potential offset of this amount. Georegistration processes would likely introduce an additional 30-60 meters offset. Areas found to be missclassifed were recoded or aggregated, as appropriate, at this juncture. Mixed classes falling outside of the pure class confidence interval were then allowed to fall out into a single mixed class.