There are specific standards that refer to the production of both hardcopy tax maps and digital datasets. This chapter does not attempt to reproduce all of the specifications involved with tax mapping, but rather to discuss those standards that are most relevant to automated parcel maps. Spatial data standards have been promulgated regarding the content, preparation, and accuracy of maps. Accuracy pertains to the quality of data and the number of errors in the dataset. Of particular importance to digital datasets are positional and attribute accuracy.
Precision takes into account how well geographic or attribute data is recorded.
For instance, engineers may measure a road with great precision to a fraction of an inch. There are several facets to the issue of accuracy. First, users must consider the quality of data used to produce the spatial dataset. If the condition of hardcopy makes the transfer of accurate information into digital format highly questionable, users may wish to base the conversion on deeds or record plans held at the county or district Registry of Deeds. Of course this process does not mean that all adjoining parcels will fit together like a jigsaw puzzle.