Synchronizing GIS with MSAG & ALI
document is the NENA information document for the synchronization of
certain Geographic Information Systems (GIS) database layers with the
Master Street Address Guide, the Automatic Location Information data,
and optionally the site / structure locations.
This document is meant to provide PSAP management, vendors, and other
interested parties necessary guidelines for synchronizing GIS data with
existing 9-1-1 databases. The synchronization process of the GIS data
is most reliably accomplished by qualified, trained individuals or
vendors that have received formal GIS training and instruction.
This document is provided as a guide to synchronizing both the
Master Street Address Guide (MSAG) and optionally the Automatic Location
Information (ALI) databases to a Geographic Information System (GIS)
geospatial database of road centerlines, site / structure locations, and
related spatial databases. One must have a basic understanding of GIS
concepts and MSAG data, or the resources available, in order to
understand this document.
The preferred method for performing the synchronization is using
various database techniques. Emergency Service Zones, MSAG and Postal
Community Names, and optionally the ALI data and address point data will
all be used in the synchronization process. The synchronization of
these databases will improve the accuracy of the GIS data, the MSAG, and
optionally the ALI data, aid in meeting the requirements for Next
Generation 9-1-1 (NG9-1-1) and improve the accuracy of the GIS data for Public Safety Answering Point (PSAP) map display for all types of calls.
Once the corrections are made, the GIS road centerline file can then
be used to validate addressing and to generate an up-to-date MSAG file
for scrubbing service provider addresses.