Can the MAPYEAR attribute values be used to track development patterns across the state, i.e., when structures were built or changed?
A. 18: The “1899…” and “1900…” values that make up a majority of the unique values are likely past “Y2K” related errors. Values of “20020211” and later reflect the date that a point was field verified by 9-1-1. For 2007 and later the date of actual construction (unknown) and the date is was field verified (MAPYEAR) are accurate to within a few months. In previous years the association is not as close and cannot be stated other than to say that once towns notified the board the site was field verified as quickly as resources allowed.
