Provided hard copy maps to be digitized. The attribute accuracy was tested using several methods during the data development phases and completion. In addition, WAMS software tests the attributes. Overall, the attribute accuracy is believed high due to the multiple error-checking steps done redundantly during processing. The final accuracy assessment used calculated average accuracy and error rates for the human stages and software verification stages, which were done redundantly to insure double checking verification of the data coverages comprising the data set.
Exact tolerances vary with coverages, as does the date of the processing and testing.
The final accuracy values expressed are the best summation, which can be developed from the smaller areas, which comprise the data set. Data has been checked and verified against original maps and over years of use. The accuracy values expressed represent the final calculated accuracy estimate of the multiple steps of data development from source photography to completed data. The actual final should be considered as average and perhaps conservative or over estimating the percent change of error for areas in this data set. For reference points accuracy, the accuracy for the digital data are tested by visual comparison of the source with hard copy maps, and by understanding of the hardware tolerances and processing values reported by the software used in data development.